Merge tag 'ipe-pr-20260925' of git://git.kernel.org/pub/scm/linux/kernel/git/wufan/ipegrafted

Pull IPE fixes from Fan Wu:
 "Two fixes for use-after-free issues found by recent LLM-assisted code
  analysis.

   - move successful policy load auditing under the new policy
     directory's inode lock, preventing a concurrent policy deletion
     from freeing the policy while it is still being audited

   - protect the dm-verity root hash with RCU, preventing policy
     evaluation from racing with root hash replacement during preresume"

* tag 'ipe-pr-20260925' of git://git.kernel.org/pub/scm/linux/kernel/git/wufan/ipe:
  ipe: protect the dm-verity root hash with RCU
  ipe: fix use-after-free when auditing a newly loaded policy

19 files changed, 2616 insertions, 0 deletions

diff --git a/drivers/pps/Kconfig b/drivers/pps/Kconfig
new file mode 100644
index 000000000..e1651d51c
--- /dev/null
+++ b/drivers/pps/Kconfig
@@ -0,0 +1,45 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# PPS support configuration
+#
+
+menuconfig PPS
+	tristate "PPS support"
+	help
+	  PPS (Pulse Per Second) is a special pulse provided by some GPS
+	  antennae. Userland can use it to get a high-precision time
+	  reference.
+
+	  Some antennae's PPS signals are connected with the CD (Carrier
+	  Detect) pin of the serial line they use to communicate with the
+	  host. In this case use the SERIAL_LINE client support.
+
+	  Some antennae's PPS signals are connected with some special host
+	  inputs so you have to enable the corresponding client support.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called pps_core.ko.
+
+if PPS
+
+config PPS_DEBUG
+	bool "PPS debugging messages"
+	help
+	  Say Y here if you want the PPS support to produce a bunch of debug
+	  messages to the system log.  Select this if you are having a
+	  problem with PPS support and want to see more of what is going on.
+
+config NTP_PPS
+	bool "PPS kernel consumer support"
+	depends on !NO_HZ_COMMON
+	help
+	  This option adds support for direct in-kernel time
+	  synchronization using an external PPS signal.
+
+	  It doesn't work on tickless systems at the moment.
+
+source "drivers/pps/clients/Kconfig"
+
+source "drivers/pps/generators/Kconfig"
+
+endif # PPS
diff --git a/drivers/pps/Makefile b/drivers/pps/Makefile
new file mode 100644
index 000000000..0aea394d4
--- /dev/null
+++ b/drivers/pps/Makefile
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for the PPS core.
+#
+
+pps_core-y			:= pps.o kapi.o sysfs.o
+pps_core-$(CONFIG_NTP_PPS)	+= kc.o
+obj-$(CONFIG_PPS)		:= pps_core.o
+obj-y				+= clients/
+obj-$(CONFIG_PPS_GENERATOR)	+= generators/
+
+ccflags-$(CONFIG_PPS_DEBUG) := -DDEBUG
diff --git a/drivers/pps/clients/Kconfig b/drivers/pps/clients/Kconfig
new file mode 100644
index 000000000..4f3244e17
--- /dev/null
+++ b/drivers/pps/clients/Kconfig
@@ -0,0 +1,37 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# PPS clients configuration
+#
+
+comment "PPS clients support"
+
+config PPS_CLIENT_KTIMER
+	tristate "Kernel timer client (Testing client, use for debug)"
+	help
+	  If you say yes here you get support for a PPS debugging client
+	  which uses a kernel timer to generate the PPS signal.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called pps-ktimer.
+
+config PPS_CLIENT_LDISC
+	tristate "PPS line discipline"
+	depends on TTY
+	help
+	  If you say yes here you get support for a PPS source connected
+	  with the CD (Carrier Detect) pin of your serial port.
+
+config PPS_CLIENT_PARPORT
+	tristate "Parallel port PPS client"
+	depends on PARPORT
+	help
+	  If you say yes here you get support for a PPS source connected
+	  with the interrupt pin of your parallel port.
+
+config PPS_CLIENT_GPIO
+	tristate "PPS client using GPIO"
+	help
+	  If you say yes here you get support for a PPS source using
+	  GPIO. To be useful you must also register a platform device
+	  specifying the GPIO pin and other options, usually in your board
+	  setup.
diff --git a/drivers/pps/clients/Makefile b/drivers/pps/clients/Makefile
new file mode 100644
index 000000000..7a3807e57
--- /dev/null
+++ b/drivers/pps/clients/Makefile
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for PPS clients.
+#
+
+obj-$(CONFIG_PPS_CLIENT_KTIMER)	+= pps-ktimer.o
+obj-$(CONFIG_PPS_CLIENT_LDISC)	+= pps-ldisc.o
+obj-$(CONFIG_PPS_CLIENT_PARPORT) += pps_parport.o
+obj-$(CONFIG_PPS_CLIENT_GPIO)	+= pps-gpio.o
+
+ccflags-$(CONFIG_PPS_DEBUG) := -DDEBUG
diff --git a/drivers/pps/clients/pps-gpio.c b/drivers/pps/clients/pps-gpio.c
new file mode 100644
index 000000000..73ec2c733
--- /dev/null
+++ b/drivers/pps/clients/pps-gpio.c
@@ -0,0 +1,242 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * pps-gpio.c -- PPS client driver using GPIO
+ *
+ * Copyright (C) 2010 Ricardo Martins <rasm@fe.up.pt>
+ * Copyright (C) 2011 James Nuss <jamesnuss@nanometrics.ca>
+ */
+
+#define PPS_GPIO_NAME "pps-gpio"
+#define pr_fmt(fmt) PPS_GPIO_NAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/pps_kernel.h>
+#include <linux/gpio/consumer.h>
+#include <linux/list.h>
+#include <linux/property.h>
+#include <linux/timer.h>
+#include <linux/jiffies.h>
+
+/* Info for each registered platform device */
+struct pps_gpio_device_data {
+	int irq;			/* IRQ used as PPS source */
+	struct pps_device *pps;		/* PPS source device */
+	struct pps_source_info info;	/* PPS source information */
+	struct gpio_desc *gpio_pin;	/* GPIO port descriptors */
+	struct gpio_desc *echo_pin;
+	struct timer_list echo_timer;	/* timer to reset echo active state */
+	bool assert_falling_edge;
+	unsigned int echo_active_ms;	/* PPS echo active duration */
+	unsigned long echo_timeout;	/* timer timeout value in jiffies */
+	struct pps_event_time ts;	/* timestamp captured in hardirq */
+};
+
+/*
+ * Report the PPS event
+ */
+
+/*
+ * Primary hardirq handler -- runs in hardirq context even on PREEMPT_RT.
+ * Only captures the timestamp; all other work is deferred to the thread.
+ */
+static irqreturn_t pps_gpio_irq_hardirq(int irq, void *data)
+{
+	struct pps_gpio_device_data *info = data;
+
+	pps_get_ts(&info->ts);
+
+	return IRQ_WAKE_THREAD;
+}
+
+/*
+ * Threaded handler -- processes the PPS event using the timestamp
+ * captured in hardirq context above.
+ */
+static irqreturn_t pps_gpio_irq_thread(int irq, void *data)
+{
+	struct pps_gpio_device_data *info = data;
+
+	pps_event(info->pps, &info->ts, PPS_CAPTUREASSERT, data);
+
+	return IRQ_HANDLED;
+}
+
+/* This function will only be called when an ECHO GPIO is defined */
+static void pps_gpio_echo(struct pps_device *pps, int event, void *data)
+{
+	/* add_timer() needs to write into info->echo_timer */
+	struct pps_gpio_device_data *info = data;
+
+	switch (event) {
+	case PPS_CAPTUREASSERT:
+		if (pps->params.mode & PPS_ECHOASSERT)
+			gpiod_set_value(info->echo_pin, 1);
+		break;
+	}
+
+	/* fire the timer */
+	if (info->pps->params.mode & (PPS_ECHOASSERT | PPS_ECHOCLEAR)) {
+		info->echo_timer.expires = jiffies + info->echo_timeout;
+		add_timer(&info->echo_timer);
+	}
+}
+
+/* Timer callback to reset the echo pin to the inactive state */
+static void pps_gpio_echo_timer_callback(struct timer_list *t)
+{
+	const struct pps_gpio_device_data *info;
+
+	info = timer_container_of(info, t, echo_timer);
+
+	gpiod_set_value(info->echo_pin, 0);
+}
+
+static int pps_gpio_setup(struct device *dev)
+{
+	struct pps_gpio_device_data *data = dev_get_drvdata(dev);
+	int ret;
+	u32 value;
+
+	data->gpio_pin = devm_gpiod_get(dev, NULL, GPIOD_IN);
+	if (IS_ERR(data->gpio_pin))
+		return dev_err_probe(dev, PTR_ERR(data->gpio_pin),
+				     "failed to request PPS GPIO\n");
+
+	data->assert_falling_edge =
+		device_property_read_bool(dev, "assert-falling-edge");
+
+	data->echo_pin = devm_gpiod_get_optional(dev, "echo", GPIOD_OUT_LOW);
+	if (IS_ERR(data->echo_pin))
+		return dev_err_probe(dev, PTR_ERR(data->echo_pin),
+				     "failed to request ECHO GPIO\n");
+
+	if (!data->echo_pin)
+		return 0;
+
+	ret = device_property_read_u32(dev, "echo-active-ms", &value);
+	if (ret) {
+		dev_err(dev, "failed to get echo-active-ms from FW\n");
+		return ret;
+	}
+
+	/* sanity check on echo_active_ms */
+	if (!value || value > 999) {
+		dev_err(dev, "echo-active-ms: %u - bad value from FW\n", value);
+		return -EINVAL;
+	}
+
+	data->echo_active_ms = value;
+
+	return 0;
+}
+
+static unsigned long
+get_irqf_trigger_flags(const struct pps_gpio_device_data *data)
+{
+	return data->assert_falling_edge ? IRQF_TRIGGER_FALLING :
+					   IRQF_TRIGGER_RISING;
+}
+
+static int pps_gpio_probe(struct platform_device *pdev)
+{
+	struct pps_gpio_device_data *data;
+	struct device *dev = &pdev->dev;
+	int ret;
+	int pps_default_params;
+
+	/* allocate space for device info */
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	dev_set_drvdata(dev, data);
+
+	/* GPIO setup */
+	ret = pps_gpio_setup(dev);
+	if (ret)
+		return ret;
+
+	/* IRQ setup */
+	ret = gpiod_to_irq(data->gpio_pin);
+	if (ret < 0) {
+		dev_err(dev, "failed to map GPIO to IRQ: %d\n", ret);
+		return -EINVAL;
+	}
+	data->irq = ret;
+
+	/* initialize PPS specific parts of the bookkeeping data structure. */
+	data->info.mode = PPS_CAPTUREASSERT | PPS_OFFSETASSERT |
+		PPS_ECHOASSERT | PPS_CANWAIT | PPS_TSFMT_TSPEC;
+	data->info.owner = THIS_MODULE;
+	snprintf(data->info.name, PPS_MAX_NAME_LEN - 1, "%s.%d",
+		 pdev->name, pdev->id);
+	if (data->echo_pin) {
+		data->info.echo = pps_gpio_echo;
+		data->echo_timeout = msecs_to_jiffies(data->echo_active_ms);
+		timer_setup(&data->echo_timer, pps_gpio_echo_timer_callback, 0);
+	}
+
+	/* register PPS source */
+	pps_default_params = PPS_CAPTUREASSERT | PPS_OFFSETASSERT;
+	data->pps = pps_register_source(&data->info, pps_default_params);
+	if (IS_ERR(data->pps)) {
+		dev_err(dev, "failed to register IRQ %d as PPS source\n",
+			data->irq);
+		return PTR_ERR(data->pps);
+	}
+
+	/* register IRQ interrupt handler */
+	ret = request_threaded_irq(data->irq,
+			  pps_gpio_irq_hardirq, pps_gpio_irq_thread,
+			  get_irqf_trigger_flags(data) | IRQF_ONESHOT,
+			  data->info.name, data);
+	if (ret) {
+		pps_unregister_source(data->pps);
+		dev_err(dev, "failed to acquire IRQ %d\n", data->irq);
+		return -EINVAL;
+	}
+
+	dev_dbg(&data->pps->dev, "Registered IRQ %d as PPS source\n",
+		data->irq);
+
+	return 0;
+}
+
+static void pps_gpio_remove(struct platform_device *pdev)
+{
+	struct pps_gpio_device_data *data = platform_get_drvdata(pdev);
+
+	free_irq(data->irq, data);
+	pps_unregister_source(data->pps);
+	timer_delete_sync(&data->echo_timer);
+	/* reset echo pin in any case */
+	gpiod_set_value(data->echo_pin, 0);
+	dev_info(&pdev->dev, "removed IRQ %d as PPS source\n", data->irq);
+}
+
+static const struct of_device_id pps_gpio_dt_ids[] = {
+	{ .compatible = "pps-gpio", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, pps_gpio_dt_ids);
+
+static struct platform_driver pps_gpio_driver = {
+	.probe		= pps_gpio_probe,
+	.remove		= pps_gpio_remove,
+	.driver		= {
+		.name	= PPS_GPIO_NAME,
+		.of_match_table	= pps_gpio_dt_ids,
+	},
+};
+
+module_platform_driver(pps_gpio_driver);
+MODULE_AUTHOR("Ricardo Martins <rasm@fe.up.pt>");
+MODULE_AUTHOR("James Nuss <jamesnuss@nanometrics.ca>");
+MODULE_DESCRIPTION("Use GPIO pin as PPS source");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("1.2.0");
diff --git a/drivers/pps/clients/pps-ktimer.c b/drivers/pps/clients/pps-ktimer.c
new file mode 100644
index 000000000..121bd29d8
--- /dev/null
+++ b/drivers/pps/clients/pps-ktimer.c
@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * pps-ktimer.c -- kernel timer test client
+ *
+ * Copyright (C) 2005-2006   Rodolfo Giometti <giometti@linux.it>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/time.h>
+#include <linux/timer.h>
+#include <linux/pps_kernel.h>
+
+/*
+ * Global variables
+ */
+
+static struct pps_device *pps;
+static struct timer_list ktimer;
+
+/*
+ * The kernel timer
+ */
+
+static void pps_ktimer_event(struct timer_list *unused)
+{
+	struct pps_event_time ts;
+
+	/* First of all we get the time stamp... */
+	pps_get_ts(&ts);
+
+	pps_event(pps, &ts, PPS_CAPTUREASSERT, NULL);
+
+	mod_timer(&ktimer, jiffies + HZ);
+}
+
+/*
+ * The PPS info struct
+ */
+
+static struct pps_source_info pps_ktimer_info = {
+	.name		= "ktimer",
+	.path		= "",
+	.mode		= PPS_CAPTUREASSERT | PPS_OFFSETASSERT |
+			  PPS_ECHOASSERT |
+			  PPS_CANWAIT | PPS_TSFMT_TSPEC,
+	.owner		= THIS_MODULE,
+};
+
+/*
+ * Module staff
+ */
+
+static void __exit pps_ktimer_exit(void)
+{
+	dev_dbg(&pps->dev, "ktimer PPS source unregistered\n");
+
+	timer_delete_sync(&ktimer);
+	pps_unregister_source(pps);
+}
+
+static int __init pps_ktimer_init(void)
+{
+	pps = pps_register_source(&pps_ktimer_info,
+				PPS_CAPTUREASSERT | PPS_OFFSETASSERT);
+	if (IS_ERR(pps)) {
+		pr_err("cannot register PPS source\n");
+		return PTR_ERR(pps);
+	}
+
+	timer_setup(&ktimer, pps_ktimer_event, 0);
+	mod_timer(&ktimer, jiffies + HZ);
+
+	dev_dbg(&pps->dev, "ktimer PPS source registered\n");
+
+	return 0;
+}
+
+module_init(pps_ktimer_init);
+module_exit(pps_ktimer_exit);
+
+MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
+MODULE_DESCRIPTION("dummy PPS source by using a kernel timer (just for debug)");
+MODULE_LICENSE("GPL");
diff --git a/drivers/pps/clients/pps-ldisc.c b/drivers/pps/clients/pps-ldisc.c
new file mode 100644
index 000000000..fa5660f3c
--- /dev/null
+++ b/drivers/pps/clients/pps-ldisc.c
@@ -0,0 +1,141 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * pps-ldisc.c -- PPS line discipline
+ *
+ * Copyright (C) 2008	Rodolfo Giometti <giometti@linux.it>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/serial_core.h>
+#include <linux/tty.h>
+#include <linux/pps_kernel.h>
+#include <linux/bug.h>
+
+static void pps_tty_dcd_change(struct tty_struct *tty, bool active)
+{
+	struct pps_device *pps;
+	struct pps_event_time ts;
+
+	pps_get_ts(&ts);
+
+	pps = pps_lookup_dev(tty);
+	/*
+	 * This should never fail, but the ldisc locking is very
+	 * convoluted, so don't crash just in case.
+	 */
+	if (WARN_ON_ONCE(pps == NULL))
+		return;
+
+	/* Now do the PPS event report */
+	pps_event(pps, &ts, active ? PPS_CAPTUREASSERT :
+			PPS_CAPTURECLEAR, NULL);
+
+	dev_dbg(&pps->dev, "PPS %s at %lu\n",
+			active ? "assert" : "clear", jiffies);
+}
+
+static int (*alias_n_tty_open)(struct tty_struct *tty);
+
+static int pps_tty_open(struct tty_struct *tty)
+{
+	struct pps_source_info info;
+	struct tty_driver *drv = tty->driver;
+	int index = tty->index + drv->name_base;
+	struct pps_device *pps;
+	int ret;
+
+	info.owner = THIS_MODULE;
+	info.dev = NULL;
+	snprintf(info.name, PPS_MAX_NAME_LEN, "%s%d", drv->driver_name, index);
+	snprintf(info.path, PPS_MAX_NAME_LEN, "/dev/%s%d", drv->name, index);
+	info.mode = PPS_CAPTUREBOTH | \
+			PPS_OFFSETASSERT | PPS_OFFSETCLEAR | \
+			PPS_CANWAIT | PPS_TSFMT_TSPEC;
+
+	pps = pps_register_source(&info, PPS_CAPTUREBOTH | \
+				PPS_OFFSETASSERT | PPS_OFFSETCLEAR);
+	if (IS_ERR(pps)) {
+		pr_err("cannot register PPS source \"%s\"\n", info.path);
+		return PTR_ERR(pps);
+	}
+	pps->lookup_cookie = tty;
+
+	/* Now open the base class N_TTY ldisc */
+	ret = alias_n_tty_open(tty);
+	if (ret < 0) {
+		pr_err("cannot open tty ldisc \"%s\"\n", info.path);
+		goto err_unregister;
+	}
+
+	dev_dbg(&pps->dev, "source \"%s\" added\n", info.path);
+
+	return 0;
+
+err_unregister:
+	pps_unregister_source(pps);
+	return ret;
+}
+
+static void (*alias_n_tty_close)(struct tty_struct *tty);
+
+static void pps_tty_close(struct tty_struct *tty)
+{
+	struct pps_device *pps = pps_lookup_dev(tty);
+
+	alias_n_tty_close(tty);
+
+	if (WARN_ON(!pps))
+		return;
+
+	dev_info(&pps->dev, "removed\n");
+	pps_unregister_source(pps);
+}
+
+static struct tty_ldisc_ops pps_ldisc_ops;
+
+/*
+ * Module stuff
+ */
+
+static int __init pps_tty_init(void)
+{
+	int err;
+
+	/* Inherit the N_TTY's ops */
+	n_tty_inherit_ops(&pps_ldisc_ops);
+
+	/* Save N_TTY's open()/close() methods */
+	alias_n_tty_open = pps_ldisc_ops.open;
+	alias_n_tty_close = pps_ldisc_ops.close;
+
+	/* Init PPS_TTY data */
+	pps_ldisc_ops.owner = THIS_MODULE;
+	pps_ldisc_ops.num = N_PPS;
+	pps_ldisc_ops.name = "pps_tty";
+	pps_ldisc_ops.dcd_change = pps_tty_dcd_change;
+	pps_ldisc_ops.open = pps_tty_open;
+	pps_ldisc_ops.close = pps_tty_close;
+
+	err = tty_register_ldisc(&pps_ldisc_ops);
+	if (err)
+		pr_err("can't register PPS line discipline\n");
+	else
+		pr_info("PPS line discipline registered\n");
+
+	return err;
+}
+
+static void __exit pps_tty_cleanup(void)
+{
+	tty_unregister_ldisc(&pps_ldisc_ops);
+}
+
+module_init(pps_tty_init);
+module_exit(pps_tty_cleanup);
+
+MODULE_ALIAS_LDISC(N_PPS);
+MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
+MODULE_DESCRIPTION("PPS TTY device driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/pps/clients/pps_parport.c b/drivers/pps/clients/pps_parport.c
new file mode 100644
index 000000000..f5af18bc2
--- /dev/null
+++ b/drivers/pps/clients/pps_parport.c
@@ -0,0 +1,228 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * pps_parport.c -- kernel parallel port PPS client
+ *
+ * Copyright (C) 2009   Alexander Gordeev <lasaine@lvk.cs.msu.su>
+ */
+
+
+/*
+ * TODO:
+ * implement echo over SEL pin
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/irqnr.h>
+#include <linux/time.h>
+#include <linux/slab.h>
+#include <linux/parport.h>
+#include <linux/pps_kernel.h>
+
+/* module parameters */
+
+#define CLEAR_WAIT_MAX		100
+#define CLEAR_WAIT_MAX_ERRORS	5
+
+static unsigned int clear_wait = 100;
+MODULE_PARM_DESC(clear_wait,
+	"Maximum number of port reads when polling for signal clear,"
+	" zero turns clear edge capture off entirely");
+module_param(clear_wait, uint, 0);
+
+static DEFINE_IDA(pps_client_index);
+
+/* internal per port structure */
+struct pps_client_pp {
+	struct pardevice *pardev;	/* parport device */
+	struct pps_device *pps;		/* PPS device */
+	unsigned int cw;		/* port clear timeout */
+	unsigned int cw_err;		/* number of timeouts */
+	int index;			/* device number */
+};
+
+static inline int signal_is_set(struct parport *port)
+{
+	return (port->ops->read_status(port) & PARPORT_STATUS_ACK) != 0;
+}
+
+/* parport interrupt handler */
+static void parport_irq(void *handle)
+{
+	struct pps_event_time ts_assert, ts_clear;
+	struct pps_client_pp *dev = handle;
+	struct parport *port = dev->pardev->port;
+	unsigned int i;
+	unsigned long flags;
+
+	/* first of all we get the time stamp... */
+	pps_get_ts(&ts_assert);
+
+	if (dev->cw == 0)
+		/* clear edge capture disabled */
+		goto out_assert;
+
+	/* try capture the clear edge */
+
+	/* We have to disable interrupts here. The idea is to prevent
+	 * other interrupts on the same processor to introduce random
+	 * lags while polling the port. Reading from IO port is known
+	 * to take approximately 1us while other interrupt handlers can
+	 * take much more potentially.
+	 *
+	 * Interrupts won't be disabled for a long time because the
+	 * number of polls is limited by clear_wait parameter which is
+	 * kept rather low. So it should never be an issue.
+	 */
+	local_irq_save(flags);
+	/* check the signal (no signal means the pulse is lost this time) */
+	if (!signal_is_set(port)) {
+		local_irq_restore(flags);
+		dev_err(&dev->pps->dev, "lost the signal\n");
+		goto out_assert;
+	}
+
+	/* poll the port until the signal is unset */
+	for (i = dev->cw; i; i--)
+		if (!signal_is_set(port)) {
+			pps_get_ts(&ts_clear);
+			local_irq_restore(flags);
+			dev->cw_err = 0;
+			goto out_both;
+		}
+	local_irq_restore(flags);
+
+	/* timeout */
+	dev->cw_err++;
+	if (dev->cw_err >= CLEAR_WAIT_MAX_ERRORS) {
+		dev_err(&dev->pps->dev, "disabled clear edge capture after %d"
+				" timeouts\n", dev->cw_err);
+		dev->cw = 0;
+		dev->cw_err = 0;
+	}
+
+out_assert:
+	/* fire assert event */
+	pps_event(dev->pps, &ts_assert,
+			PPS_CAPTUREASSERT, NULL);
+	return;
+
+out_both:
+	/* fire assert event */
+	pps_event(dev->pps, &ts_assert,
+			PPS_CAPTUREASSERT, NULL);
+	/* fire clear event */
+	pps_event(dev->pps, &ts_clear,
+			PPS_CAPTURECLEAR, NULL);
+	return;
+}
+
+static void parport_attach(struct parport *port)
+{
+	struct pardev_cb pps_client_cb;
+	int index;
+	struct pps_client_pp *device;
+	struct pps_source_info info = {
+		.name		= KBUILD_MODNAME,
+		.path		= "",
+		.mode		= PPS_CAPTUREBOTH | \
+				  PPS_OFFSETASSERT | PPS_OFFSETCLEAR | \
+				  PPS_ECHOASSERT | PPS_ECHOCLEAR | \
+				  PPS_CANWAIT | PPS_TSFMT_TSPEC,
+		.owner		= THIS_MODULE,
+		.dev		= NULL
+	};
+
+	if (clear_wait > CLEAR_WAIT_MAX) {
+		pr_err("clear_wait value should be not greater then %d\n",
+		       CLEAR_WAIT_MAX);
+		return;
+	}
+
+	device = kzalloc_obj(struct pps_client_pp);
+	if (!device) {
+		pr_err("memory allocation failed, not attaching\n");
+		return;
+	}
+
+	index = ida_alloc(&pps_client_index, GFP_KERNEL);
+	if (index < 0)
+		goto err_free_device;
+
+	memset(&pps_client_cb, 0, sizeof(pps_client_cb));
+	pps_client_cb.private = device;
+	pps_client_cb.irq_func = parport_irq;
+	pps_client_cb.flags = PARPORT_FLAG_EXCL;
+	device->pardev = parport_register_dev_model(port,
+						    KBUILD_MODNAME,
+						    &pps_client_cb,
+						    index);
+	if (!device->pardev) {
+		pr_err("couldn't register with %s\n", port->name);
+		goto err_free_ida;
+	}
+
+	if (parport_claim_or_block(device->pardev) < 0) {
+		pr_err("couldn't claim %s\n", port->name);
+		goto err_unregister_dev;
+	}
+
+	device->pps = pps_register_source(&info,
+			PPS_CAPTUREBOTH | PPS_OFFSETASSERT | PPS_OFFSETCLEAR);
+	if (IS_ERR(device->pps)) {
+		pr_err("couldn't register PPS source\n");
+		goto err_release_dev;
+	}
+
+	device->cw = clear_wait;
+
+	port->ops->enable_irq(port);
+	device->index = index;
+
+	pr_info("attached to %s\n", port->name);
+
+	return;
+
+err_release_dev:
+	parport_release(device->pardev);
+err_unregister_dev:
+	parport_unregister_device(device->pardev);
+err_free_ida:
+	ida_free(&pps_client_index, index);
+err_free_device:
+	kfree(device);
+}
+
+static void parport_detach(struct parport *port)
+{
+	struct pardevice *pardev = port->cad;
+	struct pps_client_pp *device;
+
+	/* FIXME: oooh, this is ugly! */
+	if (!pardev || strcmp(pardev->name, KBUILD_MODNAME))
+		/* not our port */
+		return;
+
+	device = pardev->private;
+
+	port->ops->disable_irq(port);
+	pps_unregister_source(device->pps);
+	parport_release(pardev);
+	parport_unregister_device(pardev);
+	ida_free(&pps_client_index, device->index);
+	kfree(device);
+}
+
+static struct parport_driver pps_parport_driver = {
+	.name = KBUILD_MODNAME,
+	.match_port = parport_attach,
+	.detach = parport_detach,
+};
+module_parport_driver(pps_parport_driver);
+
+MODULE_AUTHOR("Alexander Gordeev <lasaine@lvk.cs.msu.su>");
+MODULE_DESCRIPTION("parallel port PPS client");
+MODULE_LICENSE("GPL");
diff --git a/drivers/pps/generators/Kconfig b/drivers/pps/generators/Kconfig
new file mode 100644
index 000000000..4ef02b3f2
--- /dev/null
+++ b/drivers/pps/generators/Kconfig
@@ -0,0 +1,42 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# PPS generators configuration
+#
+
+menuconfig PPS_GENERATOR
+	tristate "PPS generators support"
+	help
+	  PPS generators are special hardware which are able to produce PPS
+	  (Pulse Per Second) signals.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called pps_gen_core.
+
+if PPS_GENERATOR
+
+config PPS_GENERATOR_DUMMY
+        tristate "Dummy PPS generator (Testing generator, use for debug)"
+        help
+          If you say yes here you get support for a PPS debugging generator
+          (which generates no PPS signal at all).
+
+          This driver can also be built as a module.  If so, the module
+          will be called pps_gen-dummy.
+
+config PPS_GENERATOR_TIO
+	tristate "TIO PPS signal generator"
+	depends on X86 && CPU_SUP_INTEL
+	help
+	  If you say yes here you get support for a PPS TIO signal generator
+	  which generates a pulse at a prescribed time based on the system clock.
+	  It uses time translation and hrtimers to precisely generate a pulse.
+	  This hardware is present on 2019 and newer Intel CPUs. However, this
+	  driver is not useful without adding highly specialized hardware outside
+	  the Linux system to observe these pulses.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called pps_gen_tio.
+
+	  If unsure, say N.
+
+endif # PPS_GENERATOR
diff --git a/drivers/pps/generators/Makefile b/drivers/pps/generators/Makefile
new file mode 100644
index 000000000..5d38774b4
--- /dev/null
+++ b/drivers/pps/generators/Makefile
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for PPS generators.
+#
+
+pps_gen_core-y			:= pps_gen.o sysfs.o
+obj-$(CONFIG_PPS_GENERATOR)	:= pps_gen_core.o
+
+obj-$(CONFIG_PPS_GENERATOR_DUMMY)   += pps_gen-dummy.o
+obj-$(CONFIG_PPS_GENERATOR_TIO)     += pps_gen_tio.o
+
+ccflags-$(CONFIG_PPS_DEBUG) := -DDEBUG
diff --git a/drivers/pps/generators/pps_gen-dummy.c b/drivers/pps/generators/pps_gen-dummy.c
new file mode 100644
index 000000000..a4395543c
--- /dev/null
+++ b/drivers/pps/generators/pps_gen-dummy.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * PPS dummy generator
+ *
+ * Copyright (C) 2024 Rodolfo Giometti <giometti@enneenne.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/time.h>
+#include <linux/timer.h>
+#include <linux/random.h>
+#include <linux/pps_gen_kernel.h>
+
+static struct pps_gen_device *pps_gen;
+static struct timer_list ktimer;
+
+static unsigned int get_random_delay(void)
+{
+	unsigned int delay = get_random_u8() & 0x0f;
+
+	return (delay + 1) * HZ;
+}
+
+/*
+ * The kernel timer
+ */
+
+static void pps_gen_ktimer_event(struct timer_list *unused)
+{
+	pps_gen_event(pps_gen, PPS_GEN_EVENT_MISSEDPULSE, NULL);
+}
+
+/*
+ * PPS Generator methods
+ */
+
+static int pps_gen_dummy_get_time(struct pps_gen_device *pps_gen,
+					struct timespec64 *time)
+{
+	ktime_get_real_ts64(time);
+	return 0;
+}
+
+static int pps_gen_dummy_enable(struct pps_gen_device *pps_gen, bool enable)
+{
+	if (enable)
+		mod_timer(&ktimer, jiffies + get_random_delay());
+	else
+		timer_delete_sync(&ktimer);
+
+	return 0;
+}
+
+/*
+ * The PPS info struct
+ */
+
+static const struct pps_gen_source_info pps_gen_dummy_info = {
+	.use_system_clock	= true,
+	.get_time		= pps_gen_dummy_get_time,
+	.enable			= pps_gen_dummy_enable,
+};
+
+/*
+ * Module staff
+ */
+
+static void __exit pps_gen_dummy_exit(void)
+{
+	timer_delete_sync(&ktimer);
+	pps_gen_unregister_source(pps_gen);
+}
+
+static int __init pps_gen_dummy_init(void)
+{
+	pps_gen = pps_gen_register_source(&pps_gen_dummy_info);
+	if (IS_ERR(pps_gen))
+		return PTR_ERR(pps_gen);
+
+	timer_setup(&ktimer, pps_gen_ktimer_event, 0);
+
+	return 0;
+}
+
+module_init(pps_gen_dummy_init);
+module_exit(pps_gen_dummy_exit);
+
+MODULE_AUTHOR("Rodolfo Giometti <giometti@enneenne.com>");
+MODULE_DESCRIPTION("LinuxPPS dummy generator");
+MODULE_LICENSE("GPL");
diff --git a/drivers/pps/generators/pps_gen.c b/drivers/pps/generators/pps_gen.c
new file mode 100644
index 000000000..5e207c75e
--- /dev/null
+++ b/drivers/pps/generators/pps_gen.c
@@ -0,0 +1,346 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * PPS generators core file
+ *
+ * Copyright (C) 2024 Rodolfo Giometti <giometti@enneenne.com>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/time.h>
+#include <linux/timex.h>
+#include <linux/uaccess.h>
+#include <linux/idr.h>
+#include <linux/cdev.h>
+#include <linux/poll.h>
+#include <linux/fs.h>
+#include <linux/pps_gen_kernel.h>
+#include <linux/slab.h>
+
+/*
+ * Local variables
+ */
+
+static dev_t pps_gen_devt;
+static const struct class pps_gen_class = {
+	.name		= "pps-gen",
+	.dev_groups	= pps_gen_groups
+};
+
+static DEFINE_IDA(pps_gen_ida);
+
+/*
+ * Char device methods
+ */
+
+static __poll_t pps_gen_cdev_poll(struct file *file, poll_table *wait)
+{
+	struct pps_gen_device *pps_gen = file->private_data;
+
+	poll_wait(file, &pps_gen->queue, wait);
+	return EPOLLIN | EPOLLRDNORM;
+}
+
+static int pps_gen_cdev_fasync(int fd, struct file *file, int on)
+{
+	struct pps_gen_device *pps_gen = file->private_data;
+
+	return fasync_helper(fd, file, on, &pps_gen->async_queue);
+}
+
+static long pps_gen_cdev_ioctl(struct file *file,
+		unsigned int cmd, unsigned long arg)
+{
+	struct pps_gen_device *pps_gen = file->private_data;
+	void __user *uarg = (void __user *) arg;
+	unsigned int __user *uiuarg = (unsigned int __user *) arg;
+	unsigned int status;
+	int ret;
+
+	switch (cmd) {
+	case PPS_GEN_SETENABLE:
+		dev_dbg(pps_gen->dev, "PPS_GEN_SETENABLE\n");
+
+		ret = get_user(status, uiuarg);
+		if (ret)
+			return -EFAULT;
+
+		ret = pps_gen->info->enable(pps_gen, status);
+		if (ret)
+			return ret;
+		pps_gen->enabled = status;
+
+		break;
+
+	case PPS_GEN_USESYSTEMCLOCK:
+		dev_dbg(pps_gen->dev, "PPS_GEN_USESYSTEMCLOCK\n");
+
+		ret = put_user(pps_gen->info->use_system_clock, uiuarg);
+		if (ret)
+			return -EFAULT;
+
+		break;
+
+	case PPS_GEN_FETCHEVENT: {
+		struct pps_gen_event info;
+		unsigned int ev = pps_gen->last_ev;
+
+		dev_dbg(pps_gen->dev, "PPS_GEN_FETCHEVENT\n");
+
+		ret = wait_event_interruptible(pps_gen->queue,
+				ev != pps_gen->last_ev);
+		if (ret == -ERESTARTSYS) {
+			dev_dbg(pps_gen->dev, "pending signal caught\n");
+			return -EINTR;
+		}
+
+		spin_lock_irq(&pps_gen->lock);
+		info.sequence = pps_gen->sequence;
+		info.event = pps_gen->event;
+		spin_unlock_irq(&pps_gen->lock);
+
+		ret = copy_to_user(uarg, &info, sizeof(struct pps_gen_event));
+		if (ret)
+			return -EFAULT;
+
+		break;
+	}
+	default:
+		return -ENOTTY;
+	}
+
+	return 0;
+}
+
+static int pps_gen_cdev_open(struct inode *inode, struct file *file)
+{
+	struct pps_gen_device *pps_gen = container_of(inode->i_cdev,
+				struct pps_gen_device, cdev);
+
+	get_device(pps_gen->dev);
+	file->private_data = pps_gen;
+	return 0;
+}
+
+static int pps_gen_cdev_release(struct inode *inode, struct file *file)
+{
+	struct pps_gen_device *pps_gen = file->private_data;
+
+	put_device(pps_gen->dev);
+	return 0;
+}
+
+/*
+ * Char device stuff
+ */
+
+static const struct file_operations pps_gen_cdev_fops = {
+	.owner		= THIS_MODULE,
+	.poll	   = pps_gen_cdev_poll,
+	.fasync	 = pps_gen_cdev_fasync,
+	.unlocked_ioctl	= pps_gen_cdev_ioctl,
+	.open		= pps_gen_cdev_open,
+	.release	= pps_gen_cdev_release,
+};
+
+static void pps_gen_device_destruct(struct device *dev)
+{
+	struct pps_gen_device *pps_gen = dev_get_drvdata(dev);
+
+	cdev_del(&pps_gen->cdev);
+
+	pr_debug("deallocating pps-gen%d\n", pps_gen->id);
+	ida_free(&pps_gen_ida, pps_gen->id);
+
+	kfree(dev);
+	kfree(pps_gen);
+}
+
+static int pps_gen_register_cdev(struct pps_gen_device *pps_gen)
+{
+	int err;
+	dev_t devt;
+
+	err = ida_alloc_max(&pps_gen_ida, PPS_GEN_MAX_SOURCES - 1, GFP_KERNEL);
+	if (err < 0) {
+		if (err == -ENOSPC) {
+			pr_err("too many PPS sources in the system\n");
+			err = -EBUSY;
+		}
+		return err;
+	}
+	pps_gen->id = err;
+
+	devt = MKDEV(MAJOR(pps_gen_devt), pps_gen->id);
+
+	cdev_init(&pps_gen->cdev, &pps_gen_cdev_fops);
+	pps_gen->cdev.owner = pps_gen->info->owner;
+
+	err = cdev_add(&pps_gen->cdev, devt, 1);
+	if (err) {
+		pr_err("failed to add char device %d:%d\n",
+				MAJOR(pps_gen_devt), pps_gen->id);
+		goto free_ida;
+	}
+	pps_gen->dev = device_create(&pps_gen_class, pps_gen->info->parent, devt,
+				     pps_gen, "pps-gen%d", pps_gen->id);
+	if (IS_ERR(pps_gen->dev)) {
+		err = PTR_ERR(pps_gen->dev);
+		goto del_cdev;
+	}
+	pps_gen->dev->release = pps_gen_device_destruct;
+	dev_set_drvdata(pps_gen->dev, pps_gen);
+
+	pr_debug("generator got cdev (%d:%d)\n",
+			MAJOR(pps_gen_devt), pps_gen->id);
+
+	return 0;
+
+del_cdev:
+	cdev_del(&pps_gen->cdev);
+free_ida:
+	ida_free(&pps_gen_ida, pps_gen->id);
+	return err;
+}
+
+static void pps_gen_unregister_cdev(struct pps_gen_device *pps_gen)
+{
+	pr_debug("unregistering pps-gen%d\n", pps_gen->id);
+	device_destroy(&pps_gen_class, pps_gen->dev->devt);
+}
+
+/*
+ * Exported functions
+ */
+
+/**
+ * pps_gen_register_source() - add a PPS generator in the system
+ * @info: the PPS generator info struct
+ *
+ * This function is used to register a new PPS generator in the system.
+ * When it returns successfully the new generator is up and running, and
+ * it can be managed by the userspace.
+ *
+ * Return: the PPS generator device in case of success, and ERR_PTR(errno)
+ *	 otherwise.
+ */
+struct pps_gen_device *pps_gen_register_source(const struct pps_gen_source_info *info)
+{
+	struct pps_gen_device *pps_gen;
+	int err;
+
+	pps_gen = kzalloc_obj(struct pps_gen_device);
+	if (pps_gen == NULL) {
+		err = -ENOMEM;
+		goto pps_gen_register_source_exit;
+	}
+	pps_gen->info = info;
+	pps_gen->enabled = false;
+
+	init_waitqueue_head(&pps_gen->queue);
+	spin_lock_init(&pps_gen->lock);
+
+	/* Create the char device */
+	err = pps_gen_register_cdev(pps_gen);
+	if (err < 0) {
+		pr_err(" unable to create char device\n");
+		goto kfree_pps_gen;
+	}
+
+	return pps_gen;
+
+kfree_pps_gen:
+	kfree(pps_gen);
+
+pps_gen_register_source_exit:
+	pr_err("unable to register generator\n");
+
+	return ERR_PTR(err);
+}
+EXPORT_SYMBOL(pps_gen_register_source);
+
+/**
+ * pps_gen_unregister_source() - remove a PPS generator from the system
+ * @pps_gen: the PPS generator device to be removed
+ *
+ * This function is used to deregister a PPS generator from the system. When
+ * called, it disables the generator so no pulses are generated anymore.
+ */
+void pps_gen_unregister_source(struct pps_gen_device *pps_gen)
+{
+	pps_gen_unregister_cdev(pps_gen);
+}
+EXPORT_SYMBOL(pps_gen_unregister_source);
+
+/* pps_gen_event - register a PPS generator event into the system
+ * @pps: the PPS generator device
+ * @event: the event type
+ * @data: userdef pointer
+ *
+ * This function is used by each PPS generator in order to register a new
+ * PPS event into the system (it's usually called inside an IRQ handler).
+ */
+void pps_gen_event(struct pps_gen_device *pps_gen,
+			unsigned int event, void *data)
+{
+	unsigned long flags;
+
+	dev_dbg(pps_gen->dev, "PPS generator event %u\n", event);
+
+	spin_lock_irqsave(&pps_gen->lock, flags);
+
+	pps_gen->event = event;
+	pps_gen->sequence++;
+
+	pps_gen->last_ev++;
+	wake_up_interruptible_all(&pps_gen->queue);
+	kill_fasync(&pps_gen->async_queue, SIGIO, POLL_IN);
+
+	spin_unlock_irqrestore(&pps_gen->lock, flags);
+}
+EXPORT_SYMBOL(pps_gen_event);
+
+/*
+ * Module stuff
+ */
+
+static void __exit pps_gen_exit(void)
+{
+	class_unregister(&pps_gen_class);
+	unregister_chrdev_region(pps_gen_devt, PPS_GEN_MAX_SOURCES);
+}
+
+static int __init pps_gen_init(void)
+{
+	int err;
+
+	err = class_register(&pps_gen_class);
+	if (err) {
+		pr_err("failed to register class\n");
+		return err;
+	}
+
+	err = alloc_chrdev_region(&pps_gen_devt, 0,
+					PPS_GEN_MAX_SOURCES, "pps-gen");
+	if (err < 0) {
+		pr_err("failed to allocate char device region\n");
+		goto remove_class;
+	}
+
+	return 0;
+
+remove_class:
+	class_unregister(&pps_gen_class);
+	return err;
+}
+
+subsys_initcall(pps_gen_init);
+module_exit(pps_gen_exit);
+
+MODULE_AUTHOR("Rodolfo Giometti <giometti@enneenne.com>");
+MODULE_DESCRIPTION("LinuxPPS generators support");
+MODULE_LICENSE("GPL");
diff --git a/drivers/pps/generators/pps_gen_tio.c b/drivers/pps/generators/pps_gen_tio.c
new file mode 100644
index 000000000..5088aaf1a
--- /dev/null
+++ b/drivers/pps/generators/pps_gen_tio.c
@@ -0,0 +1,267 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Intel PPS signal Generator Driver
+ *
+ * Copyright (C) 2024 Intel Corporation
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/cleanup.h>
+#include <linux/container_of.h>
+#include <linux/device.h>
+#include <linux/hrtimer.h>
+#include <linux/io-64-nonatomic-hi-lo.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pps_gen_kernel.h>
+#include <linux/timekeeping.h>
+#include <linux/types.h>
+
+#include <asm/cpu_device_id.h>
+
+#define TIOCTL			0x00
+#define TIOCOMPV		0x10
+#define TIOEC			0x30
+
+/* Control Register */
+#define TIOCTL_EN			BIT(0)
+#define TIOCTL_DIR			BIT(1)
+#define TIOCTL_EP			GENMASK(3, 2)
+#define TIOCTL_EP_RISING_EDGE		FIELD_PREP(TIOCTL_EP, 0)
+#define TIOCTL_EP_FALLING_EDGE		FIELD_PREP(TIOCTL_EP, 1)
+#define TIOCTL_EP_TOGGLE_EDGE		FIELD_PREP(TIOCTL_EP, 2)
+
+/* Safety time to set hrtimer early */
+#define SAFE_TIME_NS			(10 * NSEC_PER_MSEC)
+
+#define MAGIC_CONST			(NSEC_PER_SEC - SAFE_TIME_NS)
+#define ART_HW_DELAY_CYCLES		2
+
+struct pps_tio {
+	struct pps_gen_source_info gen_info;
+	struct pps_gen_device *pps_gen;
+	struct hrtimer timer;
+	void __iomem *base;
+	u32 prev_count;
+	spinlock_t lock;
+	struct device *dev;
+};
+
+static inline u32 pps_tio_read(u32 offset, struct pps_tio *tio)
+{
+	return readl(tio->base + offset);
+}
+
+static inline void pps_ctl_write(u32 value, struct pps_tio *tio)
+{
+	writel(value, tio->base + TIOCTL);
+}
+
+/*
+ * For COMPV register, It's safer to write
+ * higher 32-bit followed by lower 32-bit
+ */
+static inline void pps_compv_write(u64 value, struct pps_tio *tio)
+{
+	hi_lo_writeq(value, tio->base + TIOCOMPV);
+}
+
+static inline ktime_t first_event(struct pps_tio *tio)
+{
+	return ktime_set(ktime_get_real_seconds() + 1, MAGIC_CONST);
+}
+
+static u32 pps_tio_disable(struct pps_tio *tio)
+{
+	u32 ctrl;
+
+	ctrl = pps_tio_read(TIOCTL, tio);
+	pps_compv_write(0, tio);
+
+	ctrl &= ~TIOCTL_EN;
+	pps_ctl_write(ctrl, tio);
+	tio->pps_gen->enabled = false;
+	tio->prev_count = 0;
+	return ctrl;
+}
+
+static void pps_tio_enable(struct pps_tio *tio)
+{
+	u32 ctrl;
+
+	ctrl = pps_tio_read(TIOCTL, tio);
+	ctrl |= TIOCTL_EN;
+	pps_ctl_write(ctrl, tio);
+	tio->pps_gen->enabled = true;
+}
+
+static void pps_tio_direction_output(struct pps_tio *tio)
+{
+	u32 ctrl;
+
+	ctrl = pps_tio_disable(tio);
+
+	/*
+	 * We enable the device, be sure that the
+	 * 'compare' value is invalid
+	 */
+	pps_compv_write(0, tio);
+
+	ctrl &= ~(TIOCTL_DIR | TIOCTL_EP);
+	ctrl |= TIOCTL_EP_TOGGLE_EDGE;
+	pps_ctl_write(ctrl, tio);
+	pps_tio_enable(tio);
+}
+
+static bool pps_generate_next_pulse(ktime_t expires, struct pps_tio *tio)
+{
+	u64 art;
+
+	if (!ktime_real_to_base_clock(expires, CSID_X86_ART, &art)) {
+		pps_tio_disable(tio);
+		return false;
+	}
+
+	pps_compv_write(art - ART_HW_DELAY_CYCLES, tio);
+	return true;
+}
+
+static enum hrtimer_restart hrtimer_callback(struct hrtimer *timer)
+{
+	ktime_t expires, now;
+	u32 event_count;
+	struct pps_tio *tio = container_of(timer, struct pps_tio, timer);
+
+	guard(spinlock)(&tio->lock);
+
+	/*
+	 * Check if any event is missed.
+	 * If an event is missed, TIO will be disabled.
+	 */
+	event_count = pps_tio_read(TIOEC, tio);
+	if (tio->prev_count && tio->prev_count == event_count)
+		goto err;
+	tio->prev_count = event_count;
+
+	expires = hrtimer_get_expires(timer);
+
+	now = ktime_get_real();
+	if (now - expires >= SAFE_TIME_NS)
+		goto err;
+
+	tio->pps_gen->enabled = pps_generate_next_pulse(expires + SAFE_TIME_NS, tio);
+	if (!tio->pps_gen->enabled)
+		return HRTIMER_NORESTART;
+
+	hrtimer_forward(timer, now, NSEC_PER_SEC / 2);
+	return HRTIMER_RESTART;
+
+err:
+	dev_err(tio->dev, "Event missed, Disabling Timed I/O");
+	pps_tio_disable(tio);
+	pps_gen_event(tio->pps_gen, PPS_GEN_EVENT_MISSEDPULSE, NULL);
+	return HRTIMER_NORESTART;
+}
+
+static int pps_tio_gen_enable(struct pps_gen_device *pps_gen, bool enable)
+{
+	struct pps_tio *tio = container_of(pps_gen->info, struct pps_tio, gen_info);
+
+	if (!timekeeping_clocksource_has_base(CSID_X86_ART)) {
+		dev_err_once(tio->dev, "PPS cannot be used as clock is not related to ART");
+		return -ENODEV;
+	}
+
+	guard(spinlock_irqsave)(&tio->lock);
+	if (enable && !pps_gen->enabled) {
+		pps_tio_direction_output(tio);
+		hrtimer_start(&tio->timer, first_event(tio), HRTIMER_MODE_ABS);
+	} else if (!enable && pps_gen->enabled) {
+		hrtimer_cancel(&tio->timer);
+		pps_tio_disable(tio);
+	}
+
+	return 0;
+}
+
+static int pps_tio_get_time(struct pps_gen_device *pps_gen,
+			    struct timespec64 *time)
+{
+	ktime_get_real_ts64(time);
+	return 0;
+}
+
+static int pps_gen_tio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct pps_tio *tio;
+
+	if (!(cpu_feature_enabled(X86_FEATURE_TSC_KNOWN_FREQ) &&
+	      cpu_feature_enabled(X86_FEATURE_ART))) {
+		dev_warn(dev, "TSC/ART is not enabled");
+		return -ENODEV;
+	}
+
+	tio = devm_kzalloc(dev, sizeof(*tio), GFP_KERNEL);
+	if (!tio)
+		return -ENOMEM;
+
+	tio->gen_info.use_system_clock = true;
+	tio->gen_info.enable = pps_tio_gen_enable;
+	tio->gen_info.get_time = pps_tio_get_time;
+	tio->gen_info.owner = THIS_MODULE;
+
+	tio->pps_gen = pps_gen_register_source(&tio->gen_info);
+	if (IS_ERR(tio->pps_gen))
+		return PTR_ERR(tio->pps_gen);
+
+	tio->dev = dev;
+	tio->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(tio->base))
+		return PTR_ERR(tio->base);
+
+	pps_tio_disable(tio);
+	hrtimer_setup(&tio->timer, hrtimer_callback, CLOCK_REALTIME,
+		      HRTIMER_MODE_ABS);
+	spin_lock_init(&tio->lock);
+	platform_set_drvdata(pdev, tio);
+
+	return 0;
+}
+
+static void pps_gen_tio_remove(struct platform_device *pdev)
+{
+	struct pps_tio *tio = platform_get_drvdata(pdev);
+
+	hrtimer_cancel(&tio->timer);
+	pps_tio_disable(tio);
+	pps_gen_unregister_source(tio->pps_gen);
+}
+
+static const struct acpi_device_id intel_pmc_tio_acpi_match[] = {
+	{ "INTC1021" },
+	{ "INTC1022" },
+	{ "INTC1023" },
+	{ "INTC1024" },
+	{}
+};
+MODULE_DEVICE_TABLE(acpi, intel_pmc_tio_acpi_match);
+
+static struct platform_driver pps_gen_tio_driver = {
+	.probe          = pps_gen_tio_probe,
+	.remove         = pps_gen_tio_remove,
+	.driver         = {
+		.name                   = "intel-pps-gen-tio",
+		.acpi_match_table       = intel_pmc_tio_acpi_match,
+	},
+};
+module_platform_driver(pps_gen_tio_driver);
+
+MODULE_AUTHOR("Christopher Hall <christopher.s.hall@intel.com>");
+MODULE_AUTHOR("Lakshmi Sowjanya D <lakshmi.sowjanya.d@intel.com>");
+MODULE_AUTHOR("Pandith N <pandith.n@intel.com>");
+MODULE_AUTHOR("Thejesh Reddy T R <thejesh.reddy.t.r@intel.com>");
+MODULE_AUTHOR("Subramanian Mohan <subramanian.mohan@intel.com>");
+MODULE_DESCRIPTION("Intel PMC Time-Aware IO Generator Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/pps/generators/sysfs.c b/drivers/pps/generators/sysfs.c
new file mode 100644
index 000000000..6d6bc0006
--- /dev/null
+++ b/drivers/pps/generators/sysfs.c
@@ -0,0 +1,75 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * PPS generators sysfs support
+ *
+ * Copyright (C) 2024 Rodolfo Giometti <giometti@enneenne.com>
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/pps_gen_kernel.h>
+
+/*
+ * Attribute functions
+ */
+
+static ssize_t system_show(struct device *dev, struct device_attribute *attr,
+				char *buf)
+{
+	struct pps_gen_device *pps_gen = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%d\n", pps_gen->info->use_system_clock);
+}
+static DEVICE_ATTR_RO(system);
+
+static ssize_t time_show(struct device *dev, struct device_attribute *attr,
+				char *buf)
+{
+	struct pps_gen_device *pps_gen = dev_get_drvdata(dev);
+	struct timespec64 time;
+	int ret;
+
+	ret = pps_gen->info->get_time(pps_gen, &time);
+	if (ret)
+		return ret;
+
+	return sysfs_emit(buf, "%llu %09lu\n", time.tv_sec, time.tv_nsec);
+}
+static DEVICE_ATTR_RO(time);
+
+static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
+				const char *buf, size_t count)
+{
+	struct pps_gen_device *pps_gen = dev_get_drvdata(dev);
+	bool status;
+	int ret;
+
+	ret = kstrtobool(buf, &status);
+	if (ret)
+		return ret;
+
+	ret = pps_gen->info->enable(pps_gen, status);
+	if (ret)
+		return ret;
+	pps_gen->enabled = status;
+
+	return count;
+}
+static DEVICE_ATTR_WO(enable);
+
+static struct attribute *pps_gen_attrs[] = {
+	&dev_attr_enable.attr,
+	&dev_attr_time.attr,
+	&dev_attr_system.attr,
+	NULL,
+};
+
+static const struct attribute_group pps_gen_group = {
+	.attrs = pps_gen_attrs,
+};
+
+const struct attribute_group *pps_gen_groups[] = {
+	&pps_gen_group,
+	NULL,
+};
diff --git a/drivers/pps/kapi.c b/drivers/pps/kapi.c
new file mode 100644
index 000000000..1bf0335a1
--- /dev/null
+++ b/drivers/pps/kapi.c
@@ -0,0 +1,219 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * kernel API
+ *
+ * Copyright (C) 2005-2009   Rodolfo Giometti <giometti@linux.it>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/time.h>
+#include <linux/timex.h>
+#include <linux/spinlock.h>
+#include <linux/fs.h>
+#include <linux/pps_kernel.h>
+#include <linux/slab.h>
+
+#include "kc.h"
+
+/*
+ * Local functions
+ */
+
+static void pps_add_offset(struct pps_ktime *ts, struct pps_ktime *offset)
+{
+	ts->nsec += offset->nsec;
+	while (ts->nsec >= NSEC_PER_SEC) {
+		ts->nsec -= NSEC_PER_SEC;
+		ts->sec++;
+	}
+	while (ts->nsec < 0) {
+		ts->nsec += NSEC_PER_SEC;
+		ts->sec--;
+	}
+	ts->sec += offset->sec;
+}
+
+static void pps_echo_client_default(struct pps_device *pps, int event,
+		void *data)
+{
+	dev_info(&pps->dev, "echo %s %s\n",
+		event & PPS_CAPTUREASSERT ? "assert" : "",
+		event & PPS_CAPTURECLEAR ? "clear" : "");
+}
+
+/*
+ * Exported functions
+ */
+
+/* pps_register_source - add a PPS source in the system
+ * @info: the PPS info struct
+ * @default_params: the default PPS parameters of the new source
+ *
+ * This function is used to add a new PPS source in the system. The new
+ * source is described by info's fields and it will have, as default PPS
+ * parameters, the ones specified into default_params.
+ *
+ * The function returns, in case of success, the PPS device. Otherwise
+ * ERR_PTR(errno).
+ */
+
+struct pps_device *pps_register_source(struct pps_source_info *info,
+		int default_params)
+{
+	struct pps_device *pps;
+	int err;
+
+	/* Sanity checks */
+	if ((info->mode & default_params) != default_params) {
+		pr_err("%s: unsupported default parameters\n",
+					info->name);
+		err = -EINVAL;
+		goto pps_register_source_exit;
+	}
+	if ((info->mode & (PPS_TSFMT_TSPEC | PPS_TSFMT_NTPFP)) == 0) {
+		pr_err("%s: unspecified time format\n",
+					info->name);
+		err = -EINVAL;
+		goto pps_register_source_exit;
+	}
+
+	/* Allocate memory for the new PPS source struct */
+	pps = kzalloc_obj(struct pps_device);
+	if (pps == NULL) {
+		err = -ENOMEM;
+		goto pps_register_source_exit;
+	}
+
+	/* These initializations must be done before calling idr_alloc()
+	 * in order to avoid reces into pps_event().
+	 */
+	pps->params.api_version = PPS_API_VERS;
+	pps->params.mode = default_params;
+	pps->info = *info;
+
+	/* check for default echo function */
+	if ((pps->info.mode & (PPS_ECHOASSERT | PPS_ECHOCLEAR)) &&
+			pps->info.echo == NULL)
+		pps->info.echo = pps_echo_client_default;
+
+	init_waitqueue_head(&pps->queue);
+	spin_lock_init(&pps->lock);
+
+	/* Create the char device */
+	err = pps_register_cdev(pps);
+	if (err < 0) {
+		pr_err("%s: unable to create char device\n",
+					info->name);
+		goto pps_register_source_exit;
+	}
+
+	dev_dbg(&pps->dev, "new PPS source %s\n", info->name);
+
+	return pps;
+
+pps_register_source_exit:
+	pr_err("%s: unable to register source\n", info->name);
+
+	return ERR_PTR(err);
+}
+EXPORT_SYMBOL(pps_register_source);
+
+/* pps_unregister_source - remove a PPS source from the system
+ * @pps: the PPS source
+ *
+ * This function is used to remove a previously registered PPS source from
+ * the system.
+ */
+
+void pps_unregister_source(struct pps_device *pps)
+{
+	pps_kc_remove(pps);
+	pps_unregister_cdev(pps);
+
+	/* don't have to kfree(pps) here because it will be done on
+	 * device destruction */
+}
+EXPORT_SYMBOL(pps_unregister_source);
+
+/* pps_event - register a PPS event into the system
+ * @pps: the PPS device
+ * @ts: the event timestamp
+ * @event: the event type
+ * @data: userdef pointer
+ *
+ * This function is used by each PPS client in order to register a new
+ * PPS event into the system (it's usually called inside an IRQ handler).
+ *
+ * If an echo function is associated with the PPS device it will be called
+ * as:
+ *	pps->info.echo(pps, event, data);
+ */
+void pps_event(struct pps_device *pps, struct pps_event_time *ts, int event,
+		void *data)
+{
+	unsigned long flags;
+	int captured = 0;
+	struct pps_ktime ts_real = { .sec = 0, .nsec = 0, .flags = 0 };
+
+	/* check event type */
+	BUG_ON((event & (PPS_CAPTUREASSERT | PPS_CAPTURECLEAR)) == 0);
+
+	dev_dbg(&pps->dev, "PPS event at %ptSp\n", &ts->ts_real);
+
+	timespec_to_pps_ktime(&ts_real, ts->ts_real);
+
+	spin_lock_irqsave(&pps->lock, flags);
+
+	/* Must call the echo function? */
+	if ((pps->params.mode & (PPS_ECHOASSERT | PPS_ECHOCLEAR)))
+		pps->info.echo(pps, event, data);
+
+	/* Check the event */
+	pps->current_mode = pps->params.mode;
+	if (event & pps->params.mode & PPS_CAPTUREASSERT) {
+		/* We have to add an offset? */
+		if (pps->params.mode & PPS_OFFSETASSERT)
+			pps_add_offset(&ts_real,
+					&pps->params.assert_off_tu);
+
+		/* Save the time stamp */
+		pps->assert_tu = ts_real;
+		pps->assert_sequence++;
+		dev_dbg(&pps->dev, "capture assert seq #%u\n",
+			pps->assert_sequence);
+
+		captured = ~0;
+	}
+	if (event & pps->params.mode & PPS_CAPTURECLEAR) {
+		/* We have to add an offset? */
+		if (pps->params.mode & PPS_OFFSETCLEAR)
+			pps_add_offset(&ts_real,
+					&pps->params.clear_off_tu);
+
+		/* Save the time stamp */
+		pps->clear_tu = ts_real;
+		pps->clear_sequence++;
+		dev_dbg(&pps->dev, "capture clear seq #%u\n",
+			pps->clear_sequence);
+
+		captured = ~0;
+	}
+
+	pps_kc_event(pps, ts, event);
+
+	/* Wake up if captured something */
+	if (captured) {
+		pps->last_ev++;
+		wake_up_interruptible_all(&pps->queue);
+
+		kill_fasync(&pps->async_queue, SIGIO, POLL_IN);
+	}
+
+	spin_unlock_irqrestore(&pps->lock, flags);
+}
+EXPORT_SYMBOL(pps_event);
diff --git a/drivers/pps/kc.c b/drivers/pps/kc.c
new file mode 100644
index 000000000..4f8fffa7e
--- /dev/null
+++ b/drivers/pps/kc.c
@@ -0,0 +1,119 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * PPS kernel consumer API
+ *
+ * Copyright (C) 2009-2010   Alexander Gordeev <lasaine@lvk.cs.msu.su>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/pps_kernel.h>
+
+#include "kc.h"
+
+/*
+ * Global variables
+ */
+
+/* state variables to bind kernel consumer */
+static DEFINE_SPINLOCK(pps_kc_hardpps_lock);
+/* PPS API (RFC 2783): current source and mode for kernel consumer */
+static struct pps_device *pps_kc_hardpps_dev;	/* unique pointer to device */
+static int pps_kc_hardpps_mode;		/* mode bits for kernel consumer */
+
+/* pps_kc_bind - control PPS kernel consumer binding
+ * @pps: the PPS source
+ * @bind_args: kernel consumer bind parameters
+ *
+ * This function is used to bind or unbind PPS kernel consumer according to
+ * supplied parameters. Should not be called in interrupt context.
+ */
+int pps_kc_bind(struct pps_device *pps, struct pps_bind_args *bind_args)
+{
+	/* Check if another consumer is already bound */
+	spin_lock_irq(&pps_kc_hardpps_lock);
+
+	/*
+	 * Don't allow PPS_KC_BIND on a removed device.
+	 */
+	if (pps->kc_removed) {
+		spin_unlock_irq(&pps_kc_hardpps_lock);
+		return -ENODEV;
+	}
+
+	if (bind_args->edge == 0)
+		if (pps_kc_hardpps_dev == pps) {
+			pps_kc_hardpps_mode = 0;
+			pps_kc_hardpps_dev = NULL;
+			spin_unlock_irq(&pps_kc_hardpps_lock);
+			dev_info(&pps->dev, "unbound kernel"
+					" consumer\n");
+		} else {
+			spin_unlock_irq(&pps_kc_hardpps_lock);
+			dev_err(&pps->dev, "selected kernel consumer"
+					" is not bound\n");
+			return -EINVAL;
+		}
+	else
+		if (pps_kc_hardpps_dev == NULL ||
+				pps_kc_hardpps_dev == pps) {
+			pps_kc_hardpps_mode = bind_args->edge;
+			pps_kc_hardpps_dev = pps;
+			spin_unlock_irq(&pps_kc_hardpps_lock);
+			dev_info(&pps->dev, "bound kernel consumer: "
+				"edge=0x%x\n", bind_args->edge);
+		} else {
+			spin_unlock_irq(&pps_kc_hardpps_lock);
+			dev_err(&pps->dev, "another kernel consumer"
+					" is already bound\n");
+			return -EINVAL;
+		}
+
+	return 0;
+}
+
+/* pps_kc_remove - unbind kernel consumer on PPS source removal
+ * @pps: the PPS source
+ *
+ * This function is used to disable kernel consumer on PPS source removal
+ * if this source was bound to PPS kernel consumer. Can be called on any
+ * source safely. Should not be called in interrupt context.
+ */
+void pps_kc_remove(struct pps_device *pps)
+{
+	spin_lock_irq(&pps_kc_hardpps_lock);
+
+	pps->kc_removed = true;
+	if (pps == pps_kc_hardpps_dev) {
+		pps_kc_hardpps_mode = 0;
+		pps_kc_hardpps_dev = NULL;
+		spin_unlock_irq(&pps_kc_hardpps_lock);
+		dev_info(&pps->dev, "unbound kernel consumer"
+				" on device removal\n");
+	} else
+		spin_unlock_irq(&pps_kc_hardpps_lock);
+}
+
+/* pps_kc_event - call hardpps() on PPS event
+ * @pps: the PPS source
+ * @ts: PPS event timestamp
+ * @event: PPS event edge
+ *
+ * This function calls hardpps() when an event from bound PPS source occurs.
+ */
+void pps_kc_event(struct pps_device *pps, struct pps_event_time *ts,
+		int event)
+{
+	unsigned long flags;
+
+	/* Pass some events to kernel consumer if activated */
+	spin_lock_irqsave(&pps_kc_hardpps_lock, flags);
+	if (pps == pps_kc_hardpps_dev && event & pps_kc_hardpps_mode)
+		hardpps(&ts->ts_real, &ts->ts_raw);
+	spin_unlock_irqrestore(&pps_kc_hardpps_lock, flags);
+}
diff --git a/drivers/pps/kc.h b/drivers/pps/kc.h
new file mode 100644
index 000000000..247305594
--- /dev/null
+++ b/drivers/pps/kc.h
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * PPS kernel consumer API header
+ *
+ * Copyright (C) 2009-2010   Alexander Gordeev <lasaine@lvk.cs.msu.su>
+ */
+
+#ifndef LINUX_PPS_KC_H
+#define LINUX_PPS_KC_H
+
+#include <linux/errno.h>
+#include <linux/pps_kernel.h>
+
+#ifdef CONFIG_NTP_PPS
+
+extern int pps_kc_bind(struct pps_device *pps,
+		struct pps_bind_args *bind_args);
+extern void pps_kc_remove(struct pps_device *pps);
+extern void pps_kc_event(struct pps_device *pps,
+		struct pps_event_time *ts, int event);
+
+
+#else /* CONFIG_NTP_PPS */
+
+static inline int pps_kc_bind(struct pps_device *pps,
+		struct pps_bind_args *bind_args) { return -EOPNOTSUPP; }
+static inline void pps_kc_remove(struct pps_device *pps) {}
+static inline void pps_kc_event(struct pps_device *pps,
+		struct pps_event_time *ts, int event) {}
+
+#endif /* CONFIG_NTP_PPS */
+
+#endif /* LINUX_PPS_KC_H */
diff --git a/drivers/pps/pps.c b/drivers/pps/pps.c
new file mode 100644
index 000000000..7ecdd774a
--- /dev/null
+++ b/drivers/pps/pps.c
@@ -0,0 +1,509 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * PPS core file
+ *
+ * Copyright (C) 2005-2009   Rodolfo Giometti <giometti@linux.it>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/uaccess.h>
+#include <linux/idr.h>
+#include <linux/mutex.h>
+#include <linux/cdev.h>
+#include <linux/poll.h>
+#include <linux/pps_kernel.h>
+#include <linux/slab.h>
+
+#include "kc.h"
+
+/*
+ * Local variables
+ */
+
+static int pps_major;
+static const struct class pps_class = {
+	.name		= "pps",
+	.dev_groups	= pps_groups
+};
+
+static DEFINE_MUTEX(pps_idr_lock);
+static DEFINE_IDR(pps_idr);
+
+/*
+ * Char device methods
+ */
+
+static __poll_t pps_cdev_poll(struct file *file, poll_table *wait)
+{
+	struct pps_device *pps = file->private_data;
+
+	poll_wait(file, &pps->queue, wait);
+
+	if (pps->last_fetched_ev == pps->last_ev)
+		return 0;
+
+	return EPOLLIN | EPOLLRDNORM;
+}
+
+static int pps_cdev_fasync(int fd, struct file *file, int on)
+{
+	struct pps_device *pps = file->private_data;
+	return fasync_helper(fd, file, on, &pps->async_queue);
+}
+
+static int pps_cdev_pps_fetch(struct pps_device *pps, struct pps_fdata *fdata)
+{
+	unsigned int ev = pps->last_ev;
+	int err = 0;
+
+	/* Manage the timeout */
+	if (fdata->timeout.flags & PPS_TIME_INVALID)
+		err = wait_event_interruptible(pps->queue,
+				ev != pps->last_ev);
+	else {
+		struct timespec64 ts;
+		unsigned long ticks;
+
+		dev_dbg(&pps->dev, "timeout %lld.%09d\n",
+				(long long) fdata->timeout.sec,
+				fdata->timeout.nsec);
+
+		if (fdata->timeout.sec < 0)
+			return -ETIMEDOUT;
+
+		ts.tv_sec = fdata->timeout.sec;
+		ts.tv_nsec = fdata->timeout.nsec;
+		ticks = timespec64_to_jiffies(&ts);
+
+		if (ticks != 0) {
+			err = wait_event_interruptible_timeout(
+					pps->queue,
+					ev != pps->last_ev,
+					ticks);
+			if (err == 0)
+				return -ETIMEDOUT;
+		}
+	}
+
+	/* Check for pending signals */
+	if (err == -ERESTARTSYS) {
+		dev_dbg(&pps->dev, "pending signal caught\n");
+		return -EINTR;
+	}
+
+	return 0;
+}
+
+static long pps_cdev_ioctl(struct file *file,
+		unsigned int cmd, unsigned long arg)
+{
+	struct pps_device *pps = file->private_data;
+	struct pps_kparams params;
+	void __user *uarg = (void __user *) arg;
+	int __user *iuarg = (int __user *) arg;
+	int err;
+
+	switch (cmd) {
+	case PPS_GETPARAMS:
+		dev_dbg(&pps->dev, "PPS_GETPARAMS\n");
+
+		spin_lock_irq(&pps->lock);
+
+		/* Get the current parameters */
+		params = pps->params;
+
+		spin_unlock_irq(&pps->lock);
+
+		err = copy_to_user(uarg, &params, sizeof(struct pps_kparams));
+		if (err)
+			return -EFAULT;
+
+		break;
+
+	case PPS_SETPARAMS:
+		dev_dbg(&pps->dev, "PPS_SETPARAMS\n");
+
+		/* Check the capabilities */
+		if (!capable(CAP_SYS_TIME))
+			return -EPERM;
+
+		err = copy_from_user(&params, uarg, sizeof(struct pps_kparams));
+		if (err)
+			return -EFAULT;
+		if (!(params.mode & (PPS_CAPTUREASSERT | PPS_CAPTURECLEAR))) {
+			dev_dbg(&pps->dev, "capture mode unspecified (%x)\n",
+								params.mode);
+			return -EINVAL;
+		}
+
+		/* Check for supported capabilities */
+		if ((params.mode & ~pps->info.mode) != 0) {
+			dev_dbg(&pps->dev, "unsupported capabilities (%x)\n",
+								params.mode);
+			return -EINVAL;
+		}
+
+		spin_lock_irq(&pps->lock);
+
+		/* Save the new parameters */
+		pps->params = params;
+
+		/* Restore the read only parameters */
+		if ((params.mode & (PPS_TSFMT_TSPEC | PPS_TSFMT_NTPFP)) == 0) {
+			/* section 3.3 of RFC 2783 interpreted */
+			dev_dbg(&pps->dev, "time format unspecified (%x)\n",
+								params.mode);
+			pps->params.mode |= PPS_TSFMT_TSPEC;
+		}
+		if (pps->info.mode & PPS_CANWAIT)
+			pps->params.mode |= PPS_CANWAIT;
+		pps->params.api_version = PPS_API_VERS;
+
+		/*
+		 * Clear unused fields of pps_kparams to avoid leaking
+		 * uninitialized data of the PPS_SETPARAMS caller via
+		 * PPS_GETPARAMS
+		 */
+		pps->params.assert_off_tu.flags = 0;
+		pps->params.clear_off_tu.flags = 0;
+
+		spin_unlock_irq(&pps->lock);
+
+		break;
+
+	case PPS_GETCAP:
+		dev_dbg(&pps->dev, "PPS_GETCAP\n");
+
+		err = put_user(pps->info.mode, iuarg);
+		if (err)
+			return -EFAULT;
+
+		break;
+
+	case PPS_FETCH: {
+		struct pps_fdata fdata;
+
+		dev_dbg(&pps->dev, "PPS_FETCH\n");
+
+		err = copy_from_user(&fdata, uarg, sizeof(struct pps_fdata));
+		if (err)
+			return -EFAULT;
+
+		err = pps_cdev_pps_fetch(pps, &fdata);
+		if (err)
+			return err;
+
+		/* Return the fetched timestamp and save last fetched event  */
+		spin_lock_irq(&pps->lock);
+
+		pps->last_fetched_ev = pps->last_ev;
+
+		fdata.info.assert_sequence = pps->assert_sequence;
+		fdata.info.clear_sequence = pps->clear_sequence;
+		fdata.info.assert_tu = pps->assert_tu;
+		fdata.info.clear_tu = pps->clear_tu;
+		fdata.info.current_mode = pps->current_mode;
+
+		spin_unlock_irq(&pps->lock);
+
+		err = copy_to_user(uarg, &fdata, sizeof(struct pps_fdata));
+		if (err)
+			return -EFAULT;
+
+		break;
+	}
+	case PPS_KC_BIND: {
+		struct pps_bind_args bind_args;
+
+		dev_dbg(&pps->dev, "PPS_KC_BIND\n");
+
+		/* Check the capabilities */
+		if (!capable(CAP_SYS_TIME))
+			return -EPERM;
+
+		if (copy_from_user(&bind_args, uarg,
+					sizeof(struct pps_bind_args)))
+			return -EFAULT;
+
+		/* Check for supported capabilities */
+		if ((bind_args.edge & ~pps->info.mode) != 0) {
+			dev_err(&pps->dev, "unsupported capabilities (%x)\n",
+					bind_args.edge);
+			return -EINVAL;
+		}
+
+		/* Validate parameters roughly */
+		if (bind_args.tsformat != PPS_TSFMT_TSPEC ||
+				(bind_args.edge & ~PPS_CAPTUREBOTH) != 0 ||
+				bind_args.consumer != PPS_KC_HARDPPS) {
+			dev_err(&pps->dev, "invalid kernel consumer bind"
+					" parameters (%x)\n", bind_args.edge);
+			return -EINVAL;
+		}
+
+		err = pps_kc_bind(pps, &bind_args);
+		if (err < 0)
+			return err;
+
+		break;
+	}
+	default:
+		return -ENOTTY;
+	}
+
+	return 0;
+}
+
+#ifdef CONFIG_COMPAT
+static long pps_cdev_compat_ioctl(struct file *file,
+		unsigned int cmd, unsigned long arg)
+{
+	struct pps_device *pps = file->private_data;
+	void __user *uarg = (void __user *) arg;
+
+	cmd = _IOC(_IOC_DIR(cmd), _IOC_TYPE(cmd), _IOC_NR(cmd), sizeof(void *));
+
+	if (cmd == PPS_FETCH) {
+		struct pps_fdata_compat compat;
+		struct pps_fdata fdata;
+		int err;
+
+		dev_dbg(&pps->dev, "PPS_FETCH\n");
+
+		err = copy_from_user(&compat, uarg, sizeof(struct pps_fdata_compat));
+		if (err)
+			return -EFAULT;
+
+		memcpy(&fdata.timeout, &compat.timeout,
+					sizeof(struct pps_ktime_compat));
+
+		err = pps_cdev_pps_fetch(pps, &fdata);
+		if (err)
+			return err;
+
+		/* Return the fetched timestamp and save last fetched event  */
+		spin_lock_irq(&pps->lock);
+
+		pps->last_fetched_ev = pps->last_ev;
+
+		compat.info.assert_sequence = pps->assert_sequence;
+		compat.info.clear_sequence = pps->clear_sequence;
+		compat.info.current_mode = pps->current_mode;
+
+		memcpy(&compat.info.assert_tu, &pps->assert_tu,
+				sizeof(struct pps_ktime_compat));
+		memcpy(&compat.info.clear_tu, &pps->clear_tu,
+				sizeof(struct pps_ktime_compat));
+
+		spin_unlock_irq(&pps->lock);
+
+		return copy_to_user(uarg, &compat,
+				sizeof(struct pps_fdata_compat)) ? -EFAULT : 0;
+	}
+
+	return pps_cdev_ioctl(file, cmd, arg);
+}
+#else
+#define pps_cdev_compat_ioctl	NULL
+#endif
+
+static struct pps_device *pps_idr_get(unsigned long id)
+{
+	struct pps_device *pps;
+
+	mutex_lock(&pps_idr_lock);
+	pps = idr_find(&pps_idr, id);
+	if (pps)
+		get_device(&pps->dev);
+
+	mutex_unlock(&pps_idr_lock);
+	return pps;
+}
+
+static int pps_cdev_open(struct inode *inode, struct file *file)
+{
+	struct pps_device *pps = pps_idr_get(iminor(inode));
+
+	if (!pps)
+		return -ENODEV;
+
+	file->private_data = pps;
+	return 0;
+}
+
+static int pps_cdev_release(struct inode *inode, struct file *file)
+{
+	struct pps_device *pps = file->private_data;
+
+	WARN_ON(pps->id != iminor(inode));
+	put_device(&pps->dev);
+	return 0;
+}
+
+/*
+ * Char device stuff
+ */
+
+static const struct file_operations pps_cdev_fops = {
+	.owner		= THIS_MODULE,
+	.poll		= pps_cdev_poll,
+	.fasync		= pps_cdev_fasync,
+	.compat_ioctl	= pps_cdev_compat_ioctl,
+	.unlocked_ioctl	= pps_cdev_ioctl,
+	.open		= pps_cdev_open,
+	.release	= pps_cdev_release,
+};
+
+static void pps_device_destruct(struct device *dev)
+{
+	struct pps_device *pps = dev_get_drvdata(dev);
+
+	pr_debug("deallocating pps%d\n", pps->id);
+	kfree(pps);
+}
+
+int pps_register_cdev(struct pps_device *pps)
+{
+	int err;
+
+	mutex_lock(&pps_idr_lock);
+	/*
+	 * Get new ID for the new PPS source.  After idr_alloc() calling
+	 * the new source will be freely available into the kernel.
+	 */
+	err = idr_alloc(&pps_idr, pps, 0, PPS_MAX_SOURCES, GFP_KERNEL);
+	if (err < 0) {
+		if (err == -ENOSPC) {
+			pr_err("%s: too many PPS sources in the system\n",
+			       pps->info.name);
+			err = -EBUSY;
+		}
+		kfree(pps);
+		goto out_unlock;
+	}
+	pps->id = err;
+
+	pps->dev.class = &pps_class;
+	pps->dev.parent = pps->info.dev;
+	pps->dev.devt = MKDEV(pps_major, pps->id);
+	dev_set_drvdata(&pps->dev, pps);
+	dev_set_name(&pps->dev, "pps%d", pps->id);
+	pps->dev.release = pps_device_destruct;
+	err = device_register(&pps->dev);
+	if (err)
+		goto free_idr;
+
+	pr_debug("source %s got cdev (%d:%d)\n", pps->info.name, pps_major,
+		 pps->id);
+
+	get_device(&pps->dev);
+	mutex_unlock(&pps_idr_lock);
+	return 0;
+
+free_idr:
+	idr_remove(&pps_idr, pps->id);
+	put_device(&pps->dev);
+out_unlock:
+	mutex_unlock(&pps_idr_lock);
+	return err;
+}
+
+void pps_unregister_cdev(struct pps_device *pps)
+{
+	pr_debug("unregistering pps%d\n", pps->id);
+	pps->lookup_cookie = NULL;
+	device_destroy(&pps_class, pps->dev.devt);
+
+	/* Now we can release the ID for re-use */
+	mutex_lock(&pps_idr_lock);
+	idr_remove(&pps_idr, pps->id);
+	put_device(&pps->dev);
+	mutex_unlock(&pps_idr_lock);
+}
+
+/*
+ * Look up a pps device by magic cookie.
+ * The cookie is usually a pointer to some enclosing device, but this
+ * code doesn't care; you should never be dereferencing it.
+ *
+ * This is a bit of a kludge that is currently used only by the PPS
+ * serial line discipline.  It may need to be tweaked when a second user
+ * is found.
+ *
+ * There is no function interface for setting the lookup_cookie field.
+ * It's initialized to NULL when the pps device is created, and if a
+ * client wants to use it, just fill it in afterward.
+ *
+ * The cookie is automatically set to NULL in pps_unregister_source()
+ * so that it will not be used again, even if the pps device cannot
+ * be removed from the idr due to pending references holding the minor
+ * number in use.
+ *
+ * Since pps_idr holds a reference to the device, the returned
+ * pps_device is guaranteed to be valid until pps_unregister_cdev() is
+ * called on it. But after calling pps_unregister_cdev(), it may be
+ * freed at any time.
+ */
+struct pps_device *pps_lookup_dev(void const *cookie)
+{
+	struct pps_device *pps;
+	unsigned id;
+
+	rcu_read_lock();
+	idr_for_each_entry(&pps_idr, pps, id)
+		if (cookie == pps->lookup_cookie)
+			break;
+	rcu_read_unlock();
+	return pps;
+}
+EXPORT_SYMBOL(pps_lookup_dev);
+
+/*
+ * Module stuff
+ */
+
+static void __exit pps_exit(void)
+{
+	class_unregister(&pps_class);
+	__unregister_chrdev(pps_major, 0, PPS_MAX_SOURCES, "pps");
+}
+
+static int __init pps_init(void)
+{
+	int err;
+
+	err = class_register(&pps_class);
+	if (err) {
+		pr_err("failed to register class\n");
+		return err;
+	}
+
+	pps_major = __register_chrdev(0, 0, PPS_MAX_SOURCES, "pps",
+				      &pps_cdev_fops);
+	if (pps_major < 0) {
+		pr_err("failed to allocate char device region\n");
+		goto remove_class;
+	}
+
+	pr_info("LinuxPPS API ver. %d registered\n", PPS_API_VERS);
+	pr_info("Software ver. %s - Copyright 2005-2007 Rodolfo Giometti "
+		"<giometti@linux.it>\n", PPS_VERSION);
+
+	return 0;
+
+remove_class:
+	class_unregister(&pps_class);
+	return pps_major;
+}
+
+subsys_initcall(pps_init);
+module_exit(pps_exit);
+
+MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
+MODULE_DESCRIPTION("LinuxPPS support (RFC 2783) - ver. " PPS_VERSION);
+MODULE_LICENSE("GPL");
diff --git a/drivers/pps/sysfs.c b/drivers/pps/sysfs.c
new file mode 100644
index 000000000..134bc33f6
--- /dev/null
+++ b/drivers/pps/sysfs.c
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * PPS sysfs support
+ *
+ * Copyright (C) 2007-2009   Rodolfo Giometti <giometti@linux.it>
+ */
+
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/pps_kernel.h>
+
+/*
+ * Attribute functions
+ */
+
+static ssize_t assert_show(struct device *dev, struct device_attribute *attr,
+			   char *buf)
+{
+	struct pps_device *pps = dev_get_drvdata(dev);
+
+	if (!(pps->info.mode & PPS_CAPTUREASSERT))
+		return 0;
+
+	return sprintf(buf, "%lld.%09d#%d\n",
+			(long long) pps->assert_tu.sec, pps->assert_tu.nsec,
+			pps->assert_sequence);
+}
+static DEVICE_ATTR_RO(assert);
+
+static ssize_t clear_show(struct device *dev, struct device_attribute *attr,
+			  char *buf)
+{
+	struct pps_device *pps = dev_get_drvdata(dev);
+
+	if (!(pps->info.mode & PPS_CAPTURECLEAR))
+		return 0;
+
+	return sprintf(buf, "%lld.%09d#%d\n",
+			(long long) pps->clear_tu.sec, pps->clear_tu.nsec,
+			pps->clear_sequence);
+}
+static DEVICE_ATTR_RO(clear);
+
+static ssize_t mode_show(struct device *dev, struct device_attribute *attr,
+			 char *buf)
+{
+	struct pps_device *pps = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%4x\n", pps->info.mode);
+}
+static DEVICE_ATTR_RO(mode);
+
+static ssize_t echo_show(struct device *dev, struct device_attribute *attr,
+			 char *buf)
+{
+	struct pps_device *pps = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%d\n", !!pps->info.echo);
+}
+static DEVICE_ATTR_RO(echo);
+
+static ssize_t name_show(struct device *dev, struct device_attribute *attr,
+			 char *buf)
+{
+	struct pps_device *pps = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%s\n", pps->info.name);
+}
+static DEVICE_ATTR_RO(name);
+
+static ssize_t path_show(struct device *dev, struct device_attribute *attr,
+			 char *buf)
+{
+	struct pps_device *pps = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%s\n", pps->info.path);
+}
+static DEVICE_ATTR_RO(path);
+
+static struct attribute *pps_attrs[] = {
+	&dev_attr_assert.attr,
+	&dev_attr_clear.attr,
+	&dev_attr_mode.attr,
+	&dev_attr_echo.attr,
+	&dev_attr_name.attr,
+	&dev_attr_path.attr,
+	NULL,
+};
+
+static const struct attribute_group pps_group = {
+	.attrs = pps_attrs,
+};
+
+const struct attribute_group *pps_groups[] = {
+	&pps_group,
+	NULL,
+};