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, 272 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-syscon.c b/drivers/gpio/gpio-syscon.c
new file mode 100644
index 000000000..40064d4cf
--- /dev/null
+++ b/drivers/gpio/gpio-syscon.c
@@ -0,0 +1,272 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  SYSCON GPIO driver
+ *
+ *  Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
+ */
+
+#include <linux/err.h>
+#include <linux/gpio/driver.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+
+#define GPIO_SYSCON_FEAT_IN	BIT(0)
+#define GPIO_SYSCON_FEAT_OUT	BIT(1)
+#define GPIO_SYSCON_FEAT_DIR	BIT(2)
+
+/* SYSCON driver is designed to use 32-bit wide registers */
+#define SYSCON_REG_SIZE		(4)
+#define SYSCON_REG_BITS		(SYSCON_REG_SIZE * 8)
+
+/**
+ * struct syscon_gpio_data - Configuration for the device.
+ * @flags:		Set of GPIO_SYSCON_FEAT_ flags:
+ *			GPIO_SYSCON_FEAT_IN:	GPIOs supports input,
+ *			GPIO_SYSCON_FEAT_OUT:	GPIOs supports output,
+ *			GPIO_SYSCON_FEAT_DIR:	GPIOs supports switch direction.
+ * @bit_count:		Number of bits used as GPIOs.
+ * @dat_bit_offset:	Offset (in bits) to the first GPIO bit.
+ * @dir_bit_offset:	Optional offset (in bits) to the first bit to switch
+ *			GPIO direction (Used with GPIO_SYSCON_FEAT_DIR flag).
+ * @set:		HW specific callback to assigns output value
+ *			for signal "offset"
+ */
+
+struct syscon_gpio_data {
+	unsigned int	flags;
+	unsigned int	bit_count;
+	unsigned int	dat_bit_offset;
+	unsigned int	dir_bit_offset;
+	int		(*set)(struct gpio_chip *chip, unsigned int offset,
+			       int value);
+};
+
+struct syscon_gpio_priv {
+	struct gpio_chip		chip;
+	struct regmap			*syscon;
+	const struct syscon_gpio_data	*data;
+	u32				dreg_offset;
+	u32				dir_reg_offset;
+};
+
+static int syscon_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+	struct syscon_gpio_priv *priv = gpiochip_get_data(chip);
+	unsigned int val, offs;
+	int ret;
+
+	offs = priv->dreg_offset + priv->data->dat_bit_offset + offset;
+
+	ret = regmap_read(priv->syscon,
+			  (offs / SYSCON_REG_BITS) * SYSCON_REG_SIZE, &val);
+	if (ret)
+		return ret;
+
+	return !!(val & BIT(offs % SYSCON_REG_BITS));
+}
+
+static int syscon_gpio_set(struct gpio_chip *chip, unsigned int offset, int val)
+{
+	struct syscon_gpio_priv *priv = gpiochip_get_data(chip);
+	unsigned int offs;
+
+	offs = priv->dreg_offset + priv->data->dat_bit_offset + offset;
+
+	return regmap_update_bits(priv->syscon,
+				  (offs / SYSCON_REG_BITS) * SYSCON_REG_SIZE,
+				  BIT(offs % SYSCON_REG_BITS),
+				  val ? BIT(offs % SYSCON_REG_BITS) : 0);
+}
+
+static int syscon_gpio_dir_in(struct gpio_chip *chip, unsigned offset)
+{
+	struct syscon_gpio_priv *priv = gpiochip_get_data(chip);
+
+	if (priv->data->flags & GPIO_SYSCON_FEAT_DIR) {
+		unsigned int offs;
+
+		offs = priv->dir_reg_offset +
+		       priv->data->dir_bit_offset + offset;
+
+		regmap_update_bits(priv->syscon,
+				   (offs / SYSCON_REG_BITS) * SYSCON_REG_SIZE,
+				   BIT(offs % SYSCON_REG_BITS), 0);
+	}
+
+	return 0;
+}
+
+static int syscon_gpio_dir_out(struct gpio_chip *chip, unsigned offset, int val)
+{
+	struct syscon_gpio_priv *priv = gpiochip_get_data(chip);
+
+	if (priv->data->flags & GPIO_SYSCON_FEAT_DIR) {
+		unsigned int offs;
+
+		offs = priv->dir_reg_offset +
+		       priv->data->dir_bit_offset + offset;
+
+		regmap_update_bits(priv->syscon,
+				   (offs / SYSCON_REG_BITS) * SYSCON_REG_SIZE,
+				   BIT(offs % SYSCON_REG_BITS),
+				   BIT(offs % SYSCON_REG_BITS));
+	}
+
+	return chip->set(chip, offset, val);
+}
+
+static const struct syscon_gpio_data clps711x_mctrl_gpio = {
+	/* ARM CLPS711X SYSFLG1 Bits 8-10 */
+	.flags		= GPIO_SYSCON_FEAT_IN,
+	.bit_count	= 3,
+	.dat_bit_offset	= 0x40 * 8 + 8,
+};
+
+static int rockchip_gpio_set(struct gpio_chip *chip, unsigned int offset,
+			     int val)
+{
+	struct syscon_gpio_priv *priv = gpiochip_get_data(chip);
+	unsigned int offs;
+	u8 bit;
+	u32 data;
+	int ret;
+
+	offs = priv->dreg_offset + priv->data->dat_bit_offset + offset;
+	bit = offs % SYSCON_REG_BITS;
+	data = (val ? BIT(bit) : 0) | BIT(bit + 16);
+	ret = regmap_write(priv->syscon,
+			   (offs / SYSCON_REG_BITS) * SYSCON_REG_SIZE,
+			   data);
+	if (ret < 0)
+		dev_err(chip->parent, "gpio write failed ret(%d)\n", ret);
+
+	return ret;
+}
+
+static const struct syscon_gpio_data rockchip_rk3328_gpio_mute = {
+	/* RK3328 GPIO_MUTE is an output only pin at GRF_SOC_CON10[1] */
+	.flags		= GPIO_SYSCON_FEAT_OUT,
+	.bit_count	= 1,
+	.dat_bit_offset = 0x0428 * 8 + 1,
+	.set		= rockchip_gpio_set,
+};
+
+#define KEYSTONE_LOCK_BIT BIT(0)
+
+static int keystone_gpio_set(struct gpio_chip *chip, unsigned int offset,
+			     int val)
+{
+	struct syscon_gpio_priv *priv = gpiochip_get_data(chip);
+	unsigned int offs;
+	int ret;
+
+	offs = priv->dreg_offset + priv->data->dat_bit_offset + offset;
+
+	if (!val)
+		return 0;
+
+	ret = regmap_update_bits(
+			priv->syscon,
+			(offs / SYSCON_REG_BITS) * SYSCON_REG_SIZE,
+			BIT(offs % SYSCON_REG_BITS) | KEYSTONE_LOCK_BIT,
+			BIT(offs % SYSCON_REG_BITS) | KEYSTONE_LOCK_BIT);
+	if (ret < 0)
+		dev_err(chip->parent, "gpio write failed ret(%d)\n", ret);
+
+	return ret;
+}
+
+static const struct syscon_gpio_data keystone_dsp_gpio = {
+	/* ARM Keystone 2 */
+	.flags		= GPIO_SYSCON_FEAT_OUT,
+	.bit_count	= 28,
+	.dat_bit_offset	= 4,
+	.set		= keystone_gpio_set,
+};
+
+static const struct of_device_id syscon_gpio_ids[] = {
+	{
+		.compatible	= "cirrus,ep7209-mctrl-gpio",
+		.data		= &clps711x_mctrl_gpio,
+	},
+	{
+		.compatible	= "ti,keystone-dsp-gpio",
+		.data		= &keystone_dsp_gpio,
+	},
+	{
+		.compatible	= "rockchip,rk3328-grf-gpio",
+		.data		= &rockchip_rk3328_gpio_mute,
+	},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, syscon_gpio_ids);
+
+static int syscon_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct syscon_gpio_priv *priv;
+	struct device_node *np = dev->of_node;
+	int ret;
+	bool use_parent_regmap = false;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->data = of_device_get_match_data(dev);
+
+	priv->syscon = syscon_regmap_lookup_by_phandle(np, "gpio,syscon-dev");
+	if (IS_ERR(priv->syscon) && np->parent) {
+		priv->syscon = syscon_node_to_regmap(np->parent);
+		use_parent_regmap = true;
+	}
+	if (IS_ERR(priv->syscon))
+		return PTR_ERR(priv->syscon);
+
+	if (!use_parent_regmap) {
+		ret = of_property_read_u32_index(np, "gpio,syscon-dev", 1,
+						 &priv->dreg_offset);
+		if (ret)
+			dev_err(dev, "can't read the data register offset!\n");
+
+		priv->dreg_offset <<= 3;
+
+		ret = of_property_read_u32_index(np, "gpio,syscon-dev", 2,
+						 &priv->dir_reg_offset);
+		if (ret)
+			dev_dbg(dev, "can't read the dir register offset!\n");
+
+		priv->dir_reg_offset <<= 3;
+	}
+
+	priv->chip.parent = dev;
+	priv->chip.owner = THIS_MODULE;
+	priv->chip.label = dev_name(dev);
+	priv->chip.base = -1;
+	priv->chip.ngpio = priv->data->bit_count;
+	priv->chip.get = syscon_gpio_get;
+	if (priv->data->flags & GPIO_SYSCON_FEAT_IN)
+		priv->chip.direction_input = syscon_gpio_dir_in;
+	if (priv->data->flags & GPIO_SYSCON_FEAT_OUT) {
+		priv->chip.set = priv->data->set ? : syscon_gpio_set;
+		priv->chip.direction_output = syscon_gpio_dir_out;
+	}
+
+	return devm_gpiochip_add_data(&pdev->dev, &priv->chip, priv);
+}
+
+static struct platform_driver syscon_gpio_driver = {
+	.driver	= {
+		.name		= "gpio-syscon",
+		.of_match_table	= syscon_gpio_ids,
+	},
+	.probe	= syscon_gpio_probe,
+};
+module_platform_driver(syscon_gpio_driver);
+
+MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
+MODULE_DESCRIPTION("SYSCON GPIO driver");
+MODULE_LICENSE("GPL");