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, 362 insertions, 0 deletions

diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
new file mode 100644
index 000000000..21a7fcdd2
--- /dev/null
+++ b/drivers/mfd/syscon.c
@@ -0,0 +1,362 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * System Control Driver
+ *
+ * Copyright (C) 2012 Freescale Semiconductor, Inc.
+ * Copyright (C) 2012 Linaro Ltd.
+ *
+ * Author: Dong Aisheng <dong.aisheng@linaro.org>
+ */
+
+#include <linux/cleanup.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/hwspinlock.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <linux/mfd/syscon.h>
+#include <linux/slab.h>
+
+static DEFINE_MUTEX(syscon_list_lock);
+static LIST_HEAD(syscon_list);
+
+struct syscon {
+	struct device_node *np;
+	struct regmap *regmap;
+	struct reset_control *reset;
+	struct list_head list;
+};
+
+static const struct regmap_config syscon_regmap_config = {
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_stride = 4,
+};
+
+static struct syscon *of_syscon_register(struct device_node *np, bool check_res)
+{
+	struct clk *clk;
+	struct regmap *regmap;
+	void __iomem *base;
+	u32 reg_io_width;
+	int ret;
+	struct regmap_config syscon_config = syscon_regmap_config;
+	struct resource res;
+	struct reset_control *reset;
+	resource_size_t res_size;
+
+	WARN_ON(!mutex_is_locked(&syscon_list_lock));
+
+	struct syscon *syscon __free(kfree) = kzalloc_obj(*syscon);
+	if (!syscon)
+		return ERR_PTR(-ENOMEM);
+
+	if (of_address_to_resource(np, 0, &res))
+		return ERR_PTR(-ENOMEM);
+
+	base = of_iomap(np, 0);
+	if (!base)
+		return ERR_PTR(-ENOMEM);
+
+	/* Parse the device's DT node for an endianness specification */
+	if (of_property_read_bool(np, "big-endian"))
+		syscon_config.val_format_endian = REGMAP_ENDIAN_BIG;
+	else if (of_property_read_bool(np, "little-endian"))
+		syscon_config.val_format_endian = REGMAP_ENDIAN_LITTLE;
+	else if (of_property_read_bool(np, "native-endian"))
+		syscon_config.val_format_endian = REGMAP_ENDIAN_NATIVE;
+
+	/*
+	 * search for reg-io-width property in DT. If it is not provided,
+	 * default to 4 bytes. regmap_init_mmio will return an error if values
+	 * are invalid so there is no need to check them here.
+	 */
+	ret = of_property_read_u32(np, "reg-io-width", &reg_io_width);
+	if (ret)
+		reg_io_width = 4;
+
+	ret = of_hwspin_lock_get_id(np, 0);
+	if (ret > 0 || (IS_ENABLED(CONFIG_HWSPINLOCK) && ret == 0)) {
+		syscon_config.use_hwlock = true;
+		syscon_config.hwlock_id = ret;
+		syscon_config.hwlock_mode = HWLOCK_IRQSTATE;
+	} else if (ret < 0) {
+		switch (ret) {
+		case -ENOENT:
+			/* Ignore missing hwlock, it's optional. */
+			break;
+		default:
+			pr_err("Failed to retrieve valid hwlock: %d\n", ret);
+			fallthrough;
+		case -EPROBE_DEFER:
+			goto err_regmap;
+		}
+	}
+
+	res_size = resource_size(&res);
+	if (res_size < reg_io_width) {
+		ret = -EFAULT;
+		goto err_regmap;
+	}
+
+	syscon_config.name = kasprintf(GFP_KERNEL, "%pOFn@%pa", np, &res.start);
+	if (!syscon_config.name) {
+		ret = -ENOMEM;
+		goto err_regmap;
+	}
+	syscon_config.reg_stride = reg_io_width;
+	syscon_config.val_bits = reg_io_width * 8;
+	syscon_config.max_register = res_size - reg_io_width;
+	if (!syscon_config.max_register)
+		syscon_config.max_register_is_0 = true;
+
+	regmap = regmap_init_mmio(NULL, base, &syscon_config);
+	kfree(syscon_config.name);
+	if (IS_ERR(regmap)) {
+		pr_err("regmap init failed\n");
+		ret = PTR_ERR(regmap);
+		goto err_regmap;
+	}
+
+	if (check_res) {
+		clk = of_clk_get(np, 0);
+		if (IS_ERR(clk)) {
+			ret = PTR_ERR(clk);
+			/* clock is optional */
+			if (ret != -ENOENT)
+				goto err_clk;
+		} else {
+			ret = regmap_mmio_attach_clk(regmap, clk);
+			if (ret)
+				goto err_attach_clk;
+		}
+
+		reset = of_reset_control_get_optional_exclusive(np, NULL);
+		if (IS_ERR(reset)) {
+			ret = PTR_ERR(reset);
+			goto err_attach_clk;
+		}
+
+		ret = reset_control_deassert(reset);
+		if (ret)
+			goto err_reset;
+	}
+
+	syscon->regmap = regmap;
+	syscon->np = np;
+
+	list_add_tail(&syscon->list, &syscon_list);
+
+	return_ptr(syscon);
+
+err_reset:
+	reset_control_put(reset);
+err_attach_clk:
+	if (!IS_ERR(clk))
+		clk_put(clk);
+err_clk:
+	regmap_exit(regmap);
+err_regmap:
+	iounmap(base);
+	return ERR_PTR(ret);
+}
+
+static struct regmap *device_node_get_regmap(struct device_node *np,
+					     bool create_regmap,
+					     bool check_res)
+{
+	struct syscon *entry, *syscon = NULL;
+
+	mutex_lock(&syscon_list_lock);
+
+	list_for_each_entry(entry, &syscon_list, list)
+		if (entry->np == np) {
+			syscon = entry;
+			break;
+		}
+
+	if (!syscon) {
+		if (create_regmap)
+			syscon = of_syscon_register(np, check_res);
+		else
+			syscon = ERR_PTR(-EPROBE_DEFER);
+	}
+	mutex_unlock(&syscon_list_lock);
+
+	if (IS_ERR(syscon))
+		return ERR_CAST(syscon);
+
+	return syscon->regmap;
+}
+
+/**
+ * of_syscon_register_regmap() - Register regmap for specified device node
+ * @np: Device tree node
+ * @regmap: Pointer to regmap object
+ *
+ * Register an externally created regmap object with syscon for the specified
+ * device tree node. This regmap will then be returned to client drivers using
+ * the syscon_regmap_lookup_by_phandle() API.
+ *
+ * Return: 0 on success, negative error code on failure.
+ */
+int of_syscon_register_regmap(struct device_node *np, struct regmap *regmap)
+{
+	struct syscon *entry, *syscon = NULL;
+	int ret;
+
+	if (!np || !regmap)
+		return -EINVAL;
+
+	syscon = kzalloc_obj(*syscon);
+	if (!syscon)
+		return -ENOMEM;
+
+	/* check if syscon entry already exists */
+	mutex_lock(&syscon_list_lock);
+
+	list_for_each_entry(entry, &syscon_list, list)
+		if (entry->np == np) {
+			ret = -EEXIST;
+			goto err_unlock;
+		}
+
+	syscon->regmap = regmap;
+	syscon->np = np;
+
+	/* register the regmap in syscon list */
+	list_add_tail(&syscon->list, &syscon_list);
+	mutex_unlock(&syscon_list_lock);
+
+	return 0;
+
+err_unlock:
+	mutex_unlock(&syscon_list_lock);
+	kfree(syscon);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(of_syscon_register_regmap);
+
+/**
+ * device_node_to_regmap() - Get or create a regmap for specified device node
+ * @np: Device tree node
+ *
+ * Get a regmap for the specified device node. If there's not an existing
+ * regmap, then one is instantiated. This function should not be used if the
+ * device node has a custom regmap driver or has resources (clocks, resets) to
+ * be managed. Use syscon_node_to_regmap() instead for those cases.
+ *
+ * Return: regmap ptr on success, negative error code on failure.
+ */
+struct regmap *device_node_to_regmap(struct device_node *np)
+{
+	return device_node_get_regmap(np, true, false);
+}
+EXPORT_SYMBOL_GPL(device_node_to_regmap);
+
+/**
+ * syscon_node_to_regmap() - Get or create a regmap for specified syscon device node
+ * @np: Device tree node
+ *
+ * Get a regmap for the specified device node. If there's not an existing
+ * regmap, then one is instantiated if the node is a generic "syscon". This
+ * function is safe to use for a syscon registered with
+ * of_syscon_register_regmap().
+ *
+ * Return: regmap ptr on success, negative error code on failure.
+ */
+struct regmap *syscon_node_to_regmap(struct device_node *np)
+{
+	return device_node_get_regmap(np, of_device_is_compatible(np, "syscon"), true);
+}
+EXPORT_SYMBOL_GPL(syscon_node_to_regmap);
+
+struct regmap *syscon_regmap_lookup_by_compatible(const char *s)
+{
+	struct device_node *syscon_np;
+	struct regmap *regmap;
+
+	syscon_np = of_find_compatible_node(NULL, NULL, s);
+	if (!syscon_np)
+		return ERR_PTR(-ENODEV);
+
+	regmap = syscon_node_to_regmap(syscon_np);
+	of_node_put(syscon_np);
+
+	return regmap;
+}
+EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_compatible);
+
+struct regmap *syscon_regmap_lookup_by_phandle(struct device_node *np,
+					const char *property)
+{
+	struct device_node *syscon_np;
+	struct regmap *regmap;
+
+	if (property)
+		syscon_np = of_parse_phandle(np, property, 0);
+	else
+		syscon_np = np;
+
+	if (!syscon_np)
+		return ERR_PTR(-ENODEV);
+
+	regmap = syscon_node_to_regmap(syscon_np);
+
+	if (property)
+		of_node_put(syscon_np);
+
+	return regmap;
+}
+EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle);
+
+struct regmap *syscon_regmap_lookup_by_phandle_args(struct device_node *np,
+					const char *property,
+					int arg_count,
+					unsigned int *out_args)
+{
+	struct device_node *syscon_np;
+	struct of_phandle_args args;
+	struct regmap *regmap;
+	unsigned int index;
+	int rc;
+
+	rc = of_parse_phandle_with_fixed_args(np, property, arg_count,
+			0, &args);
+	if (rc)
+		return ERR_PTR(rc);
+
+	syscon_np = args.np;
+	if (!syscon_np)
+		return ERR_PTR(-ENODEV);
+
+	regmap = syscon_node_to_regmap(syscon_np);
+	for (index = 0; index < arg_count; index++)
+		out_args[index] = args.args[index];
+	of_node_put(syscon_np);
+
+	return regmap;
+}
+EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle_args);
+
+/*
+ * It behaves the same as syscon_regmap_lookup_by_phandle() except where
+ * there is no regmap phandle. In this case, instead of returning -ENODEV,
+ * the function returns NULL.
+ */
+struct regmap *syscon_regmap_lookup_by_phandle_optional(struct device_node *np,
+					const char *property)
+{
+	struct regmap *regmap;
+
+	regmap = syscon_regmap_lookup_by_phandle(np, property);
+	if (IS_ERR(regmap) && PTR_ERR(regmap) == -ENODEV)
+		return NULL;
+
+	return regmap;
+}
+EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle_optional);