Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linuxgrafted

Pull I3C updates from Alexandre Belloni:
 "A new driver this cycle, for the AMD AXI I3C controller.

  There are also new features such as IBI wakeup support, SETAASA device
  discovery and ACPI support for the the DAA methods, meaning we can now
  communicate with the SPD devices on DDR5 modules.

  New driver:
   - AMD AXI I3C master controller

  Subsystem:
   - I3C Common Command Code (CCC) handling improvements, especially
     around GET CCCs
   - SETAASA device discovery support
   - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as
     well as I2C devices on I3C bus
   - IBI-based wakeup support

  Drivers:
   - dw: SETAASA support
   - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C
     controller support, PIO queue management support for HCI v1.2
   - renesas: improve suspend to RAM support, add runtime PM support"

* tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits)
  i3c: dw: reduce do_daa time if there's no client
  i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller
  i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2
  i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode
  i3c: dw: rename "pclk" to "apb" to match dt-binding
  i3c: dw: make struct dw_i3c_cmd smaller
  i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding
  i3c: renesas: Don't register devices when ENTDAA times out
  i3c: master: dw-i3c-master: fix OD timing for first broadcast
  i3c: mipi-i3c-hci: Advertise IBI wakeup capability
  i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev()
  i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI
  i3c: master: Reject IBI requests from non-IBI-capable devices
  i3c: master: Add helper to query bus wakeup requirements
  i3c: master: Report wakeup events for IBIs
  i3c: master: Support IBI-based wakeup capability
  i3c: master: Fix potential UAF in i3c_device_match()
  i3c: master: Fix potential UAF in i3c_device_uevent()
  i3c: Make dev->desc locking assumptions explicit
  i3c: master: Fix use-after-free of master->this
  ...

1 files changed, 174 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-ds1216.c b/drivers/rtc/rtc-ds1216.c
new file mode 100644
index 000000000..7eeb3f359
--- /dev/null
+++ b/drivers/rtc/rtc-ds1216.c
@@ -0,0 +1,174 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Dallas DS1216 RTC driver
+ *
+ * Copyright (c) 2007 Thomas Bogendoerfer
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/rtc.h>
+#include <linux/platform_device.h>
+#include <linux/bcd.h>
+#include <linux/slab.h>
+
+struct ds1216_regs {
+	u8 tsec;
+	u8 sec;
+	u8 min;
+	u8 hour;
+	u8 wday;
+	u8 mday;
+	u8 month;
+	u8 year;
+};
+
+#define DS1216_HOUR_1224	(1 << 7)
+#define DS1216_HOUR_AMPM	(1 << 5)
+
+struct ds1216_priv {
+	struct rtc_device *rtc;
+	void __iomem *ioaddr;
+};
+
+static const u8 magic[] = {
+	0xc5, 0x3a, 0xa3, 0x5c, 0xc5, 0x3a, 0xa3, 0x5c
+};
+
+/*
+ * Read the 64 bit we'd like to have - It a series
+ * of 64 bits showing up in the LSB of the base register.
+ *
+ */
+static void ds1216_read(u8 __iomem *ioaddr, u8 *buf)
+{
+	unsigned char c;
+	int i, j;
+
+	for (i = 0; i < 8; i++) {
+		c = 0;
+		for (j = 0; j < 8; j++)
+			c |= (readb(ioaddr) & 0x1) << j;
+		buf[i] = c;
+	}
+}
+
+static void ds1216_write(u8 __iomem *ioaddr, const u8 *buf)
+{
+	unsigned char c;
+	int i, j;
+
+	for (i = 0; i < 8; i++) {
+		c = buf[i];
+		for (j = 0; j < 8; j++) {
+			writeb(c, ioaddr);
+			c = c >> 1;
+		}
+	}
+}
+
+static void ds1216_switch_ds_to_clock(u8 __iomem *ioaddr)
+{
+	/* Reset magic pointer */
+	readb(ioaddr);
+	/* Write 64 bit magic to DS1216 */
+	ds1216_write(ioaddr, magic);
+}
+
+static int ds1216_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+	struct ds1216_priv *priv = dev_get_drvdata(dev);
+	struct ds1216_regs regs;
+
+	ds1216_switch_ds_to_clock(priv->ioaddr);
+	ds1216_read(priv->ioaddr, (u8 *)&regs);
+
+	tm->tm_sec = bcd2bin(regs.sec);
+	tm->tm_min = bcd2bin(regs.min);
+	if (regs.hour & DS1216_HOUR_1224) {
+		/* AM/PM mode */
+		tm->tm_hour = bcd2bin(regs.hour & 0x1f);
+		if (regs.hour & DS1216_HOUR_AMPM)
+			tm->tm_hour += 12;
+	} else
+		tm->tm_hour = bcd2bin(regs.hour & 0x3f);
+	tm->tm_wday = (regs.wday & 7) - 1;
+	tm->tm_mday = bcd2bin(regs.mday & 0x3f);
+	tm->tm_mon = bcd2bin(regs.month & 0x1f);
+	tm->tm_year = bcd2bin(regs.year);
+	if (tm->tm_year < 70)
+		tm->tm_year += 100;
+
+	return 0;
+}
+
+static int ds1216_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+	struct ds1216_priv *priv = dev_get_drvdata(dev);
+	struct ds1216_regs regs;
+
+	ds1216_switch_ds_to_clock(priv->ioaddr);
+	ds1216_read(priv->ioaddr, (u8 *)&regs);
+
+	regs.tsec = 0; /* clear 0.1 and 0.01 seconds */
+	regs.sec = bin2bcd(tm->tm_sec);
+	regs.min = bin2bcd(tm->tm_min);
+	regs.hour &= DS1216_HOUR_1224;
+	if (regs.hour && tm->tm_hour > 12) {
+		regs.hour |= DS1216_HOUR_AMPM;
+		tm->tm_hour -= 12;
+	}
+	regs.hour |= bin2bcd(tm->tm_hour);
+	regs.wday &= ~7;
+	regs.wday |= tm->tm_wday;
+	regs.mday = bin2bcd(tm->tm_mday);
+	regs.month = bin2bcd(tm->tm_mon);
+	regs.year = bin2bcd(tm->tm_year % 100);
+
+	ds1216_switch_ds_to_clock(priv->ioaddr);
+	ds1216_write(priv->ioaddr, (u8 *)&regs);
+	return 0;
+}
+
+static const struct rtc_class_ops ds1216_rtc_ops = {
+	.read_time	= ds1216_rtc_read_time,
+	.set_time	= ds1216_rtc_set_time,
+};
+
+static int __init ds1216_rtc_probe(struct platform_device *pdev)
+{
+	struct ds1216_priv *priv;
+	u8 dummy[8];
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, priv);
+
+	priv->ioaddr = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(priv->ioaddr))
+		return PTR_ERR(priv->ioaddr);
+
+	priv->rtc = devm_rtc_device_register(&pdev->dev, "ds1216",
+					&ds1216_rtc_ops, THIS_MODULE);
+	if (IS_ERR(priv->rtc))
+		return PTR_ERR(priv->rtc);
+
+	/* dummy read to get clock into a known state */
+	ds1216_read(priv->ioaddr, dummy);
+	return 0;
+}
+
+static struct platform_driver ds1216_rtc_platform_driver = {
+	.driver		= {
+		.name	= "rtc-ds1216",
+	},
+};
+
+module_platform_driver_probe(ds1216_rtc_platform_driver, ds1216_rtc_probe);
+
+MODULE_AUTHOR("Thomas Bogendoerfer <tsbogend@alpha.franken.de>");
+MODULE_DESCRIPTION("DS1216 RTC driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:rtc-ds1216");