Re: [PATCH v3 4/5] pinctrl: add pinctrl/GPIO driver for Apple SoCs

[Mark Kettenis <mark.kettenis@xxxxxxxxx>]

> From: Joey Gouly <joey.gouly@xxxxxxx>
> Date: Sat, 16 Oct 2021 15:18:38 +0100
> 
> This driver adds support for the pinctrl / GPIO hardware found
> on some Apple SoCs.

Hi Joey,

> Co-developed-by: Stan Skowronek <stan@xxxxxxxxxxxxx>
> Signed-off-by: Stan Skowronek <stan@xxxxxxxxxxxxx>
> Signed-off-by: Joey Gouly <joey.gouly@xxxxxxx>
> ---
>  drivers/pinctrl/Kconfig              |  16 +
>  drivers/pinctrl/Makefile             |   1 +
>  drivers/pinctrl/pinctrl-apple-gpio.c | 564 +++++++++++++++++++++++++++
>  3 files changed, 581 insertions(+)
>  create mode 100644 drivers/pinctrl/pinctrl-apple-gpio.c
> 
> diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
> index 31921108e456..6a961d5f8726 100644
> --- a/drivers/pinctrl/Kconfig
> +++ b/drivers/pinctrl/Kconfig
> @@ -31,6 +31,22 @@ config DEBUG_PINCTRL
>  	help
>  	  Say Y here to add some extra checks and diagnostics to PINCTRL calls.
>  
> +config PINCTRL_APPLE_GPIO
> +	tristate "Apple SoC GPIO pin controller driver"
> +	depends on ARCH_APPLE
> +	select PINMUX
> +	select GPIOLIB
> +	select GPIOLIB_IRQCHIP
> +	select GENERIC_PINCTRL_GROUPS
> +	select GENERIC_PINMUX_FUNCTIONS
> +	select OF_GPIO
> +	help
> +	  This is the driver for the GPIO controller found on Apple ARM SoCs,
> +	  including M1.
> +
> +	  This driver can also be built as a module. If so, the module
> +	  will be called pinctrl-apple-gpio.
> +
>  config PINCTRL_ARTPEC6
>  	bool "Axis ARTPEC-6 pin controller driver"
>  	depends on MACH_ARTPEC6
> diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
> index 200073bcc2c1..5e63de2ffcf4 100644
> --- a/drivers/pinctrl/Makefile
> +++ b/drivers/pinctrl/Makefile
> @@ -8,6 +8,7 @@ obj-$(CONFIG_PINMUX)		+= pinmux.o
>  obj-$(CONFIG_PINCONF)		+= pinconf.o
>  obj-$(CONFIG_OF)		+= devicetree.o
>  obj-$(CONFIG_GENERIC_PINCONF)	+= pinconf-generic.o
> +obj-$(CONFIG_PINCTRL_APPLE_GPIO) += pinctrl-apple-gpio.o
>  obj-$(CONFIG_PINCTRL_ARTPEC6)	+= pinctrl-artpec6.o
>  obj-$(CONFIG_PINCTRL_AS3722)	+= pinctrl-as3722.o
>  obj-$(CONFIG_PINCTRL_AXP209)	+= pinctrl-axp209.o
> diff --git a/drivers/pinctrl/pinctrl-apple-gpio.c b/drivers/pinctrl/pinctrl-apple-gpio.c
> new file mode 100644
> index 000000000000..df93eb12069d
> --- /dev/null
> +++ b/drivers/pinctrl/pinctrl-apple-gpio.c
> @@ -0,0 +1,564 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Apple SoC pinctrl+GPIO+external IRQ driver
> + *
> + * Copyright (C) 2021 The Asahi Linux Contributors
> + * Copyright (C) 2020 Corellium LLC
> + *
> + * Based on: pinctrl-pistachio.c
> + * Copyright (C) 2014 Imagination Technologies Ltd.
> + * Copyright (C) 2014 Google, Inc.
> + */
> +
> +#include <dt-bindings/pinctrl/apple.h>
> +#include <linux/gpio/driver.h>
> +#include <linux/interrupt.h>
> +#include <linux/irq.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_irq.h>
> +#include <linux/pinctrl/pinctrl.h>
> +#include <linux/pinctrl/pinmux.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +
> +#include "pinctrl-utils.h"
> +#include "core.h"
> +#include "pinmux.h"
> +
> +struct apple_gpio_irq_data {
> +	struct apple_gpio_pinctrl *pctl;
> +	int irqgrp;
> +};
> +
> +struct apple_gpio_pinctrl {
> +	struct device *dev;
> +	struct pinctrl_dev *pctldev;
> +
> +	void __iomem *base;
> +	struct regmap *map;
> +	unsigned int nirqgrps;
> +
> +	struct pinctrl_desc pinctrl_desc;
> +	struct gpio_chip gpio_chip;
> +	struct irq_chip irq_chip;
> +};
> +
> +#define REG_GPIO(x)          (4 * (x))
> +#define REG_GPIOx_DATA       BIT(0)
> +#define REG_GPIOx_MODE       GENMASK(3, 1)
> +#define REG_GPIOx_OUT        1
> +#define REG_GPIOx_IN_IRQ_HI  2
> +#define REG_GPIOx_IN_IRQ_LO  3
> +#define REG_GPIOx_IN_IRQ_UP  4
> +#define REG_GPIOx_IN_IRQ_DN  5
> +#define REG_GPIOx_IN_IRQ_ANY 6
> +#define REG_GPIOx_IN_IRQ_OFF 7
> +#define REG_GPIOx_PERIPH     GENMASK(6, 5)
> +#define REG_GPIOx_PULL       GENMASK(8, 7)
> +#define REG_GPIOx_PULL_OFF   0
> +#define REG_GPIOx_PULL_DOWN  1
> +#define REG_GPIOx_PULL_UP_STRONG 2
> +#define REG_GPIOx_PULL_UP    3
> +#define REG_GPIOx_INPUT_ENABLE BIT(9)
> +#define REG_GPIOx_DRIVE_STRENGTH0 GENMASK(11, 10)
> +#define REG_GPIOx_SCHMITT    BIT(15)
> +#define REG_GPIOx_GRP        GENMASK(18, 16)
> +#define REG_GPIOx_LOCK       BIT(21)
> +#define REG_GPIOx_DRIVE_STRENGTH1 GENMASK(23, 22)
> +#define REG_IRQ(g, x)        (0x800 + 0x40 * (g) + 4 * ((x) >> 5))
> +
> +struct regmap_config regmap_config = {
> +	.reg_bits = 32,
> +	.val_bits = 32,
> +	.reg_stride = 4,
> +	.cache_type = REGCACHE_FLAT,
> +	.max_register = 512 * sizeof(uint32_t),
> +	.num_reg_defaults_raw = 512,
> +	.use_relaxed_mmio = true
> +};
> +
> +// No locking needed to mask/unmask IRQs as the interrupt mode is per pin-register.
> +static void apple_gpio_set_reg(struct apple_gpio_pinctrl *pctl,
> +			       unsigned int pin, uint32_t mask, uint32_t value)
> +{
> +	regmap_update_bits(pctl->map, REG_GPIO(pin), mask, value);
> +}
> +
> +static uint32_t apple_gpio_get_reg(struct apple_gpio_pinctrl *pctl,
> +				   unsigned int pin)
> +{
> +	uint32_t val = 0;
> +
> +	regmap_read(pctl->map, REG_GPIO(pin), &val);
> +	return val;
> +}
> +
> +/* Pin controller functions */
> +
> +static int apple_gpio_dt_node_to_map(struct pinctrl_dev *pctldev,
> +				     struct device_node *node,
> +				     struct pinctrl_map **map,
> +				     unsigned *num_maps)
> +{
> +	unsigned reserved_maps;
> +	struct apple_gpio_pinctrl *pctl;
> +	u32 pinfunc, pin, func;
> +	int num_pins, i, ret;
> +	const char *group_name;
> +	const char *function_name;
> +
> +	*map = NULL;
> +	*num_maps = 0;
> +	reserved_maps = 0;
> +
> +	pctl = pinctrl_dev_get_drvdata(pctldev);
> +
> +	ret = of_property_count_u32_elems(node, "pinmux");
> +	if (ret <= 0) {
> +		dev_err(pctl->dev,
> +			"missing or empty pinmux property in node %pOFn.\n",
> +			node);
> +		return -EINVAL;
> +	}
> +
> +	num_pins = ret;
> +
> +	ret = pinctrl_utils_reserve_map(pctldev, map, &reserved_maps, num_maps,
> +					num_pins);
> +	if (ret)
> +		return ret;
> +
> +	for (i = 0; i < num_pins; i++) {
> +		ret = of_property_read_u32_index(node, "pinmux", i, &pinfunc);
> +		if (ret)
> +			goto free_map;
> +
> +		pin = APPLE_PIN(pinfunc);
> +		func = APPLE_FUNC(pinfunc);
> +
> +		if (func >= pinmux_generic_get_function_count(pctldev)) {
> +			ret = -EINVAL;
> +			goto free_map;
> +		}
> +
> +		group_name = pinctrl_generic_get_group_name(pctldev, pin);
> +		function_name =
> +			pinmux_generic_get_function_name(pctl->pctldev, func);
> +		ret = pinctrl_utils_add_map_mux(pctl->pctldev, map,
> +						&reserved_maps, num_maps,
> +						group_name, function_name);
> +		if (ret)
> +			goto free_map;
> +	}
> +
> +free_map:
> +	if (ret < 0) {
> +		pinctrl_utils_free_map(pctldev, *map, *num_maps);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct pinctrl_ops apple_gpio_pinctrl_ops = {
> +	.get_groups_count = pinctrl_generic_get_group_count,
> +	.get_group_name = pinctrl_generic_get_group_name,
> +	.get_group_pins = pinctrl_generic_get_group_pins,
> +	.dt_node_to_map = apple_gpio_dt_node_to_map,
> +	.dt_free_map = pinctrl_utils_free_map,
> +};
> +
> +/* Pin multiplexer functions */
> +
> +static int apple_gpio_pinmux_enable(struct pinctrl_dev *pctldev, unsigned func,
> +				    unsigned group)
> +{
> +	struct apple_gpio_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
> +
> +	apple_gpio_set_reg(
> +		pctl, group, REG_GPIOx_PERIPH | REG_GPIOx_INPUT_ENABLE,
> +		FIELD_PREP(REG_GPIOx_PERIPH, func) | REG_GPIOx_INPUT_ENABLE);
> +
> +	return 0;
> +}
> +
> +static const struct pinmux_ops apple_gpio_pinmux_ops = {
> +	.get_functions_count = pinmux_generic_get_function_count,
> +	.get_function_name = pinmux_generic_get_function_name,
> +	.get_function_groups = pinmux_generic_get_function_groups,
> +	.set_mux = apple_gpio_pinmux_enable,
> +	.strict = true,
> +};
> +
> +/* GPIO chip functions */
> +
> +static int apple_gpio_gpio_get_direction(struct gpio_chip *chip,
> +					 unsigned int offset)
> +{
> +	struct apple_gpio_pinctrl *pctl = gpiochip_get_data(chip);
> +	unsigned int reg = apple_gpio_get_reg(pctl, offset);
> +
> +	return (FIELD_GET(REG_GPIOx_MODE, reg) == REG_GPIOx_OUT) ?
> +		       GPIO_LINE_DIRECTION_OUT :
> +			     GPIO_LINE_DIRECTION_IN;
> +}
> +
> +static int apple_gpio_gpio_get(struct gpio_chip *chip, unsigned offset)
> +{
> +	struct apple_gpio_pinctrl *pctl = gpiochip_get_data(chip);
> +	unsigned int reg = apple_gpio_get_reg(pctl, offset);
> +
> +	// If this is an input GPIO, read the actual value (not the cached regmap value)
> +	if (FIELD_GET(REG_GPIOx_MODE, reg) != REG_GPIOx_OUT)
> +		reg = readl_relaxed(pctl->base + REG_GPIO(offset));
> +
> +	return !!(reg & REG_GPIOx_DATA);
> +}
> +
> +static void apple_gpio_gpio_set(struct gpio_chip *chip, unsigned int offset,
> +				int value)
> +{
> +	struct apple_gpio_pinctrl *pctl = gpiochip_get_data(chip);
> +
> +	apple_gpio_set_reg(pctl, offset, REG_GPIOx_DATA,
> +			   value ? REG_GPIOx_DATA : 0);
> +}
> +
> +static int apple_gpio_gpio_direction_input(struct gpio_chip *chip,
> +					   unsigned int offset)
> +{
> +	struct apple_gpio_pinctrl *pctl = gpiochip_get_data(chip);
> +
> +	apple_gpio_set_reg(pctl, offset,
> +			   REG_GPIOx_PERIPH | REG_GPIOx_MODE | REG_GPIOx_DATA |
> +				   REG_GPIOx_INPUT_ENABLE,
> +			   FIELD_PREP(REG_GPIOx_MODE, REG_GPIOx_IN_IRQ_OFF) |
> +				   REG_GPIOx_INPUT_ENABLE);
> +	return 0;
> +}
> +
> +static int apple_gpio_gpio_direction_output(struct gpio_chip *chip,
> +					    unsigned int offset, int value)
> +{
> +	struct apple_gpio_pinctrl *pctl = gpiochip_get_data(chip);
> +
> +	apple_gpio_set_reg(pctl, offset,
> +			   REG_GPIOx_PERIPH | REG_GPIOx_MODE | REG_GPIOx_DATA,
> +			   FIELD_PREP(REG_GPIOx_MODE, REG_GPIOx_OUT) |
> +				   (value ? REG_GPIOx_DATA : 0));
> +	return 0;
> +}
> +
> +/* IRQ chip functions */
> +
> +static void apple_gpio_gpio_irq_ack(struct irq_data *data)
> +{
> +	struct apple_gpio_pinctrl *pctl =
> +		gpiochip_get_data(irq_data_get_irq_chip_data(data));
> +	unsigned int irqgrp =
> +		FIELD_GET(REG_GPIOx_GRP, apple_gpio_get_reg(pctl, data->hwirq));
> +
> +	writel(BIT(data->hwirq & 31),
> +	       pctl->base + REG_IRQ(irqgrp, data->hwirq));
> +}
> +
> +static int apple_gpio_irq_type(unsigned int type)
> +{
> +	switch (type & IRQ_TYPE_SENSE_MASK) {
> +	case IRQ_TYPE_EDGE_RISING:
> +		return REG_GPIOx_IN_IRQ_UP;
> +	case IRQ_TYPE_EDGE_FALLING:
> +		return REG_GPIOx_IN_IRQ_DN;
> +	case IRQ_TYPE_EDGE_BOTH:
> +		return REG_GPIOx_IN_IRQ_ANY;
> +	case IRQ_TYPE_LEVEL_HIGH:
> +		return REG_GPIOx_IN_IRQ_HI;
> +	case IRQ_TYPE_LEVEL_LOW:
> +		return REG_GPIOx_IN_IRQ_LO;
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +static void apple_gpio_gpio_irq_mask(struct irq_data *data)
> +{
> +	struct apple_gpio_pinctrl *pctl =
> +		gpiochip_get_data(irq_data_get_irq_chip_data(data));
> +	apple_gpio_set_reg(pctl, data->hwirq, REG_GPIOx_MODE,
> +			   FIELD_PREP(REG_GPIOx_MODE, REG_GPIOx_IN_IRQ_OFF));
> +}
> +
> +static void apple_gpio_gpio_irq_unmask(struct irq_data *data)
> +{
> +	struct apple_gpio_pinctrl *pctl =
> +		gpiochip_get_data(irq_data_get_irq_chip_data(data));
> +	int irqtype = apple_gpio_irq_type(irqd_get_trigger_type(data));
> +
> +	if (WARN_ON(irqtype < 0))
> +		return;
> +	apple_gpio_set_reg(pctl, data->hwirq, REG_GPIOx_MODE,
> +			   FIELD_PREP(REG_GPIOx_MODE, irqtype));
> +}
> +
> +static unsigned int apple_gpio_gpio_irq_startup(struct irq_data *data)
> +{
> +	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
> +	struct apple_gpio_pinctrl *pctl = gpiochip_get_data(chip);
> +
> +	apple_gpio_set_reg(pctl, data->hwirq, REG_GPIOx_GRP,
> +			   FIELD_PREP(REG_GPIOx_GRP, 0));
> +
> +	apple_gpio_gpio_direction_input(chip, data->hwirq);
> +	apple_gpio_gpio_irq_unmask(data);
> +
> +	return 0;
> +}
> +
> +static int apple_gpio_gpio_irq_set_type(struct irq_data *data,
> +					unsigned int type)
> +{
> +	struct apple_gpio_pinctrl *pctl =
> +		gpiochip_get_data(irq_data_get_irq_chip_data(data));
> +	int irqtype = apple_gpio_irq_type(type);
> +
> +	if (irqtype < 0)
> +		return irqtype;
> +
> +	irqd_set_trigger_type(data, type);
> +
> +	apple_gpio_set_reg(pctl, data->hwirq, REG_GPIOx_MODE,
> +			   FIELD_PREP(REG_GPIOx_MODE, irqtype));
> +
> +	if (type & IRQ_TYPE_LEVEL_MASK)
> +		irq_set_handler_locked(data, handle_level_irq);
> +	else
> +		irq_set_handler_locked(data, handle_edge_irq);
> +	return 0;
> +}
> +
> +static void apple_gpio_gpio_irq_handler(struct irq_desc *desc)
> +{
> +	struct apple_gpio_irq_data *data = irq_desc_get_handler_data(desc);
> +	struct apple_gpio_pinctrl *pctl = data->pctl;
> +	struct gpio_chip *gc = &pctl->gpio_chip;
> +	struct irq_chip *chip = irq_desc_get_chip(desc);
> +	unsigned int irqgrp = data->irqgrp;
> +	unsigned int pinh, pinl;
> +	unsigned long pending;
> +
> +	chained_irq_enter(chip, desc);
> +	for (pinh = 0; pinh < gc->ngpio; pinh += 32) {
> +		pending = readl(pctl->base + REG_IRQ(irqgrp, pinh));
> +		for_each_set_bit(pinl, &pending, 32)
> +			generic_handle_domain_irq(gc->irq.domain, pinh + pinl);
> +	}
> +	chained_irq_exit(chip, desc);
> +}
> +
> +/* Probe & register */
> +
> +static int apple_gpio_gpio_register(struct apple_gpio_pinctrl *pctl)
> +{
> +	struct device_node *node = pctl->dev->of_node;
> +	struct gpio_irq_chip *girq;
> +	struct apple_gpio_irq_data **irq_data;
> +	int i;
> +	int ret;
> +
> +	if (!of_find_property(node, "gpio-controller", NULL)) {
> +		dev_err(pctl->dev,
> +			"Apple GPIO must have 'gpio-controller' property.\n");
> +		return -ENODEV;
> +	}
> +
> +	pctl->gpio_chip.label = dev_name(pctl->dev);
> +	pctl->gpio_chip.request = gpiochip_generic_request;
> +	pctl->gpio_chip.free = gpiochip_generic_free;
> +	pctl->gpio_chip.get_direction = apple_gpio_gpio_get_direction;
> +	pctl->gpio_chip.direction_input = apple_gpio_gpio_direction_input;
> +	pctl->gpio_chip.direction_output = apple_gpio_gpio_direction_output;
> +	pctl->gpio_chip.get = apple_gpio_gpio_get;
> +	pctl->gpio_chip.set = apple_gpio_gpio_set;
> +	pctl->gpio_chip.base = -1;
> +	pctl->gpio_chip.ngpio = pctl->pinctrl_desc.npins;
> +	pctl->gpio_chip.parent = pctl->dev;
> +	pctl->gpio_chip.of_node = node;
> +
> +	if (of_property_read_bool(node, "interrupt-controller")) {
> +		ret = platform_irq_count(to_platform_device(pctl->dev));
> +		if (ret < 0)
> +			return ret;
> +
> +		pctl->nirqgrps = ret;
> +
> +		pctl->irq_chip.name = "Apple-GPIO";
> +		pctl->irq_chip.irq_startup = apple_gpio_gpio_irq_startup;
> +		pctl->irq_chip.irq_ack = apple_gpio_gpio_irq_ack;
> +		pctl->irq_chip.irq_mask = apple_gpio_gpio_irq_mask;
> +		pctl->irq_chip.irq_unmask = apple_gpio_gpio_irq_unmask;
> +		pctl->irq_chip.irq_set_type = apple_gpio_gpio_irq_set_type;
> +
> +		girq = &pctl->gpio_chip.irq;
> +		girq->chip = &pctl->irq_chip;
> +		girq->parent_handler = apple_gpio_gpio_irq_handler;
> +		girq->num_parents = pctl->nirqgrps;
> +
> +		girq->parents = kmalloc_array(
> +			pctl->nirqgrps, sizeof(*girq->parents), GFP_KERNEL);
> +		if (!girq->parents)
> +			return -ENOMEM;
> +
> +		for (i = 0; i < pctl->nirqgrps; i++) {
> +			ret = platform_get_irq(to_platform_device(pctl->dev),
> +					       i);
> +			if (ret < 0) {
> +				return dev_err_probe(pctl->dev, ret,
> +						     "Failed to map IRQ %d\n",
> +						     i);
> +			}
> +			girq->parents[i] = ret;
> +		}
> +
> +		irq_data = kmalloc_array(pctl->nirqgrps, sizeof(*irq_data),
> +					 GFP_KERNEL);
> +		if (!irq_data) {
> +			kfree(girq->parents);
> +			return -ENOMEM;
> +		}
> +		for (i = 0; i < pctl->nirqgrps; i++) {
> +			irq_data[i] = devm_kzalloc(
> +				pctl->dev, sizeof(*irq_data[i]), GFP_KERNEL);
> +			irq_data[i]->pctl = pctl;
> +			irq_data[i]->irqgrp = i;
> +		}
> +
> +		girq->parent_handler_data_array = (void **)irq_data;
> +		girq->per_parent_data = true;
> +		girq->default_type = IRQ_TYPE_NONE;
> +		girq->handler = handle_level_irq;
> +	}
> +
> +	ret = devm_gpiochip_add_data(pctl->dev, &pctl->gpio_chip, pctl);
> +
> +	if (of_property_read_bool(node, "interrupt-controller")) {
> +		kfree(girq->parents);
> +		kfree(irq_data);
> +	}
> +
> +	return ret;
> +}
> +
> +static int apple_gpio_pinctrl_probe(struct platform_device *pdev)
> +{
> +	struct apple_gpio_pinctrl *pctl;
> +	struct pinctrl_pin_desc *pins;
> +	unsigned int npins;
> +	const char **pin_names;
> +	unsigned int *pin_nums;
> +	unsigned int i;
> +	int res;
> +
> +	pctl = devm_kzalloc(&pdev->dev, sizeof(*pctl), GFP_KERNEL);
> +	if (!pctl)
> +		return -ENOMEM;
> +	pctl->dev = &pdev->dev;
> +	dev_set_drvdata(&pdev->dev, pctl);
> +
> +	if (of_property_read_u32(pdev->dev.of_node, "apple,npins", &npins)) {
> +		dev_err(&pdev->dev, "apple,npins property not found\n");
> +		return -EINVAL;
> +	}
> +
> +	pins = devm_kmalloc_array(&pdev->dev, npins, sizeof(pins[0]),
> +				  GFP_KERNEL);
> +	if (!pins)
> +		return -ENOMEM;
> +	pin_names = devm_kmalloc_array(&pdev->dev, npins, sizeof(pin_names[0]),
> +				       GFP_KERNEL);
> +	if (!pin_names)
> +		return -ENOMEM;
> +	pin_nums = devm_kmalloc_array(&pdev->dev, npins, sizeof(pin_nums[0]),
> +				      GFP_KERNEL);
> +	if (!pin_nums)
> +		return -ENOMEM;
> +
> +	pctl->base = devm_platform_ioremap_resource(pdev, 0);
> +	if (IS_ERR(pctl->base))
> +		return PTR_ERR(pctl->base);
> +
> +	pctl->map =
> +		devm_regmap_init_mmio(&pdev->dev, pctl->base, &regmap_config);
> +	if (IS_ERR(pctl->map)) {
> +		dev_err(&pdev->dev, "Failed to create regmap\n");
> +		return PTR_ERR(pctl->map);
> +	}
> +
> +	for (i = 0; i < npins; i++) {
> +		pins[i].number = i;
> +		pins[i].name =
> +			devm_kasprintf(&pdev->dev, GFP_KERNEL, "PIN%u", i);
> +		pins[i].drv_data = pctl;
> +		pin_names[i] = pins[i].name;
> +		pin_nums[i] = i;
> +	}
> +
> +	pctl->pinctrl_desc.name = dev_name(pctl->dev);
> +	pctl->pinctrl_desc.pins = pins;
> +	pctl->pinctrl_desc.npins = npins;
> +	pctl->pinctrl_desc.pctlops = &apple_gpio_pinctrl_ops;
> +	pctl->pinctrl_desc.pmxops = &apple_gpio_pinmux_ops;
> +
> +	pctl->pctldev =
> +		devm_pinctrl_register(&pdev->dev, &pctl->pinctrl_desc, pctl);
> +	if (IS_ERR(pctl->pctldev)) {
> +		dev_err(&pdev->dev, "Failed to register pinctrl device.\n");
> +		return PTR_ERR(pctl->pctldev);
> +	}
> +
> +	for (i = 0; i < npins; i++) {
> +		res = pinctrl_generic_add_group(pctl->pctldev, pins[i].name,
> +						pin_nums + i, 1, pctl);
> +		if (res < 0) {
> +			dev_err(pctl->dev, "Failed to register group.");
> +			return res;
> +		}
> +	}
> +
> +	res = pinmux_generic_add_function(pctl->pctldev, "gpio", pin_names,
> +					  npins, pctl);
> +	if (res < 0) {
> +		dev_err(pctl->dev, "Failed to register function.");
> +		return res;
> +	}
> +
> +	res = pinmux_generic_add_function(pctl->pctldev, "periph", pin_names,
> +					  npins, pctl);
> +	if (res < 0) {
> +		dev_err(pctl->dev, "Failed to register function.");
> +		return res;
> +	}
> +
> +	return apple_gpio_gpio_register(pctl);
> +}
> +
> +static const struct of_device_id apple_gpio_pinctrl_of_match[] = {
> +	{ .compatible = "apple,t8103-pinctrl", },
> +	{ .compatible = "apple,pinctrl", },

No need to list both.  Just "apple,pinctrl" should be enough.

> +	{ }
> +};
> +
> +static struct platform_driver apple_gpio_pinctrl_driver = {
> +	.driver = {
> +		.name = "apple-gpio-pinctrl",
> +		.of_match_table = apple_gpio_pinctrl_of_match,
> +		.suppress_bind_attrs = true,
> +	},
> +	.probe = apple_gpio_pinctrl_probe,
> +};
> +module_platform_driver(apple_gpio_pinctrl_driver);
> +
> +MODULE_DESCRIPTION("Apple pinctrl/GPIO driver");
> +MODULE_AUTHOR("Stan Skowronek <stan@xxxxxxxxxxxxx>");
> +MODULE_AUTHOR("Joey Gouly <joey.gouly@xxxxxxx>");
> +MODULE_LICENSE("GPL v2");
> -- 
> 2.17.1
> 
>