Re: [PATCH v3 10/17] pinctrl: eyeq5: add platform driver

[Rob Herring <robh@kernel.org>]

On Tue, Jan 23, 2024 at 07:46:55PM +0100, Théo Lebrun wrote:
> Add the Mobileye EyeQ5 pin controller driver. It might grow to add later
> support of other platforms from Mobileye. It belongs to a syscon region
> called OLB.
> 
> Existing pins and their function live statically in the driver code
> rather than in the devicetree, see compatible match data.
> 
> Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com>
> ---
>  MAINTAINERS                     |   1 +
>  drivers/pinctrl/Kconfig         |  15 +
>  drivers/pinctrl/Makefile        |   1 +
>  drivers/pinctrl/pinctrl-eyeq5.c | 595 ++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 612 insertions(+)
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index dd3b5834386f..9c423a4feb86 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -14794,6 +14794,7 @@ F:	arch/mips/boot/dts/mobileye/
>  F:	arch/mips/configs/eyeq5_defconfig
>  F:	arch/mips/mobileye/board-epm5.its.S
>  F:	drivers/clk/clk-eyeq5.c
> +F:	drivers/pinctrl/pinctrl-eyeq5.c
>  F:	drivers/reset/reset-eyeq5.c
>  F:	include/dt-bindings/clock/mobileye,eyeq5-clk.h
>  F:	include/dt-bindings/soc/mobileye,eyeq5.h
> diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
> index 8163a5983166..abe94de85b3d 100644
> --- a/drivers/pinctrl/Kconfig
> +++ b/drivers/pinctrl/Kconfig
> @@ -195,6 +195,21 @@ config PINCTRL_EQUILIBRIUM
>  	  desired pin functions, configure GPIO attributes for LGM SoC pins.
>  	  Pin muxing and pin config settings are retrieved from device tree.
>  
> +config PINCTRL_EYEQ5
> +	bool "Mobileye EyeQ5 pinctrl driver"
> +	depends on OF
> +	depends on MACH_EYEQ5 || COMPILE_TEST
> +	select PINMUX
> +	select GENERIC_PINCONF
> +	select MFD_SYSCON
> +	default MACH_EYEQ5
> +	help
> +	  Pin controller driver for the Mobileye EyeQ5 platform. It does both
> +	  pin config & pin muxing. It does not handle GPIO.
> +
> +	  Pin muxing supports two functions for each pin: first is GPIO, second
> +	  is pin-dependent. Pin config is about bias & drive strength.
> +
>  config PINCTRL_GEMINI
>  	bool
>  	depends on ARCH_GEMINI
> diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
> index 1071f301cc70..0033940914d9 100644
> --- a/drivers/pinctrl/Makefile
> +++ b/drivers/pinctrl/Makefile
> @@ -22,6 +22,7 @@ obj-$(CONFIG_PINCTRL_DA850_PUPD) += pinctrl-da850-pupd.o
>  obj-$(CONFIG_PINCTRL_DA9062)	+= pinctrl-da9062.o
>  obj-$(CONFIG_PINCTRL_DIGICOLOR)	+= pinctrl-digicolor.o
>  obj-$(CONFIG_PINCTRL_EQUILIBRIUM)   += pinctrl-equilibrium.o
> +obj-$(CONFIG_PINCTRL_EYEQ5)	+= pinctrl-eyeq5.o
>  obj-$(CONFIG_PINCTRL_GEMINI)	+= pinctrl-gemini.o
>  obj-$(CONFIG_PINCTRL_INGENIC)	+= pinctrl-ingenic.o
>  obj-$(CONFIG_PINCTRL_K210)	+= pinctrl-k210.o
> diff --git a/drivers/pinctrl/pinctrl-eyeq5.c b/drivers/pinctrl/pinctrl-eyeq5.c
> new file mode 100644
> index 000000000000..2d8e5b2168bd
> --- /dev/null
> +++ b/drivers/pinctrl/pinctrl-eyeq5.c
> @@ -0,0 +1,595 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Pinctrl driver for the Mobileye EyeQ5 platform.
> + *
> + * The registers are located in a syscon region called OLB. There are two pin
> + * banks, each being controlled by 5 registers (see enum eq5p_regs) for
> + * pull-down, pull-up, drive strength and muxing.
> + *
> + * For each pin, muxing is between two functions: (0) GPIO or (1) another one
> + * that is pin-dependent. Functions are declared statically in this driver.
> + *
> + * We create pinctrl groups that are 1:1 equivalent to pins: each group has a
> + * single pin, and its index/selector is the pin number/offset.
> + *
> + * We use eq5p_ as prefix, as-in "EyeQ5 Pinctrl", but way shorter.
> + *
> + * Copyright (C) 2024 Mobileye Vision Technologies Ltd.
> + */
> +#include <linux/mfd/syscon.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/pinctrl/pinconf-generic.h>
> +#include <linux/pinctrl/pinconf.h>
> +#include <linux/pinctrl/pinctrl.h>
> +#include <linux/pinctrl/pinmux.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/seq_file.h>
> +
> +#include "core.h"
> +#include "pinctrl-utils.h"
> +
> +#define GPIO_FUNC_SELECTOR 0
> +
> +struct eq5p_pinctrl {
> +	struct pinctrl_desc desc;
> +
> +	struct regmap *olb;
> +	const unsigned int *regs; /* array of size EQ5P_REG_MAX */
> +
> +	const struct eq5p_function *funcs;
> +	unsigned int nfuncs;
> +};
> +
> +struct eq5p_function {
> +	const char *name;
> +	const char * const *groups;
> +	unsigned int ngroups;
> +};
> +
> +/* OLB registers; those are offsets in an array of address offsets. */
> +enum eq5p_regs {
> +	EQ5P_PD,
> +	EQ5P_PU,
> +	EQ5P_DS_LOW,
> +	EQ5P_DS_HIGH,
> +	EQ5P_IOCR,
> +
> +	EQ5P_REG_MAX
> +};
> +
> +static int eq5p_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
> +{
> +	return pctldev->desc->npins;
> +}
> +
> +static const char *eq5p_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
> +					       unsigned int selector)
> +{
> +	return pctldev->desc->pins[selector].name;
> +}
> +
> +static int eq5p_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
> +				       unsigned int selector,
> +				       const unsigned int **pins,
> +				       unsigned int *num_pins)
> +{
> +	*pins = &pctldev->desc->pins[selector].number;
> +	*num_pins = 1;
> +	return 0;
> +}
> +
> +static int eq5p_pinconf_get(struct pinctrl_dev *pctldev, unsigned int offset,
> +			    unsigned long *config);
> +
> +static void eq5p_pinctrl_pin_dbg_show(struct pinctrl_dev *pctldev,
> +				      struct seq_file *s,
> +				      unsigned int offset)
> +{
> +	struct eq5p_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
> +	const char *pin_name = pctrl->desc.pins[offset].name;
> +	const char *func_name, *bias;
> +	unsigned int val_pd, val_pu, val_iocr;
> +	unsigned long ds_config;
> +	u32 drive_strength;
> +	bool pd, pu;
> +	int i, j;
> +
> +	/* First, let's get the function name. */
> +	regmap_read(pctrl->olb, pctrl->regs[EQ5P_IOCR], &val_iocr);
> +	if ((val_iocr & BIT(offset)) == 0) {
> +		func_name = pctrl->funcs[GPIO_FUNC_SELECTOR].name;
> +	} else {
> +		/* All pins have only two functions: GPIO and something else. We
> +		 * look for this something else.
> +		 */
> +		func_name = NULL;
> +		for (i = 0; i < pctrl->nfuncs; i++) {
> +			if (i == GPIO_FUNC_SELECTOR)
> +				continue;
> +
> +			for (j = 0; j < pctrl->funcs[i].ngroups; j++) {
> +				/* Groups and pins are the same thing for us. */
> +				const char *x = pctrl->funcs[i].groups[j];
> +
> +				if (strcmp(x, pin_name) == 0) {
> +					func_name = pctrl->funcs[i].name;
> +					break;
> +				}
> +			}
> +
> +			if (func_name)
> +				break;
> +		}
> +
> +		/* We have not found the function attached to this pin, this
> +		 * should never occur as all pins have exactly two functions.
> +		 */
> +		if (!func_name)
> +			func_name = "unknown";
> +	}
> +
> +	/* Second, we retrieve the bias. */
> +	regmap_read(pctrl->olb, pctrl->regs[EQ5P_PD], &val_pd);
> +	pd = (val_pd & BIT(offset)) != 0;
> +	regmap_read(pctrl->olb, pctrl->regs[EQ5P_PU], &val_pu);
> +	pu = (val_pu & BIT(offset)) != 0;
> +	if (pd && pu)
> +		bias = "both";
> +	else if (pd && !pu)
> +		bias = "pulldown";
> +	else if (!pd && pu)
> +		bias = "pullup";
> +	else
> +		bias = "none";
> +
> +	/* Third, we get the drive strength. */
> +	ds_config = pinconf_to_config_packed(PIN_CONFIG_DRIVE_STRENGTH, 0);
> +	eq5p_pinconf_get(pctldev, offset, &ds_config);
> +	drive_strength = pinconf_to_config_argument(ds_config);
> +
> +	seq_printf(s, "function=%s bias=%s drive_strength=%d",
> +		   func_name, bias, drive_strength);
> +}
> +
> +static const struct pinctrl_ops eq5p_pinctrl_ops = {
> +	.get_groups_count = eq5p_pinctrl_get_groups_count,
> +	.get_group_name = eq5p_pinctrl_get_group_name,
> +	.get_group_pins = eq5p_pinctrl_get_group_pins,
> +	.pin_dbg_show = eq5p_pinctrl_pin_dbg_show,
> +	.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
> +	.dt_free_map = pinctrl_utils_free_map,
> +};
> +
> +static int eq5p_pinmux_get_functions_count(struct pinctrl_dev *pctldev)
> +{
> +	struct eq5p_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
> +
> +	return pctrl->nfuncs;
> +}
> +
> +static const char *eq5p_pinmux_get_function_name(struct pinctrl_dev *pctldev,
> +						 unsigned int selector)
> +{
> +	struct eq5p_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
> +
> +	return pctrl->funcs[selector].name;
> +}
> +
> +static int eq5p_pinmux_get_function_groups(struct pinctrl_dev *pctldev,
> +					   unsigned int selector,
> +					   const char * const **groups,
> +					   unsigned int *num_groups)
> +{
> +	struct eq5p_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
> +
> +	*groups = pctrl->funcs[selector].groups;
> +	*num_groups = pctrl->funcs[selector].ngroups;
> +	return 0;
> +}
> +
> +static int eq5p_pinmux_set_mux(struct pinctrl_dev *pctldev,
> +			       unsigned int func_selector, unsigned int offset)
> +{
> +	const char *group_name = pctldev->desc->pins[offset].name;
> +	struct eq5p_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
> +	const char *func_name = pctrl->funcs[func_selector].name;
> +	bool is_gpio = func_selector == GPIO_FUNC_SELECTOR;
> +	unsigned int reg, mask, val;
> +
> +	dev_dbg(pctldev->dev, "%s: func=%s group=%s\n", __func__, func_name,
> +		group_name);
> +
> +	reg = pctrl->regs[EQ5P_IOCR];
> +	mask = BIT(offset);
> +	val = is_gpio ? 0 : U32_MAX;
> +
> +	regmap_update_bits(pctrl->olb, reg, mask, val);
> +
> +	return 0;
> +}
> +
> +static int eq5p_pinmux_gpio_request_enable(struct pinctrl_dev *pctldev,
> +					   struct pinctrl_gpio_range *range,
> +					   unsigned int offset)
> +{
> +	/* Pin offsets and group selectors are the same thing in our case. */
> +	return eq5p_pinmux_set_mux(pctldev, GPIO_FUNC_SELECTOR, offset);
> +}
> +
> +static const struct pinmux_ops eq5p_pinmux_ops = {
> +	.get_functions_count = eq5p_pinmux_get_functions_count,
> +	.get_function_name = eq5p_pinmux_get_function_name,
> +	.get_function_groups = eq5p_pinmux_get_function_groups,
> +	.set_mux = eq5p_pinmux_set_mux,
> +	.gpio_request_enable = eq5p_pinmux_gpio_request_enable,
> +	.strict = true,
> +};
> +
> +static int eq5p_pinconf_get(struct pinctrl_dev *pctldev, unsigned int offset,
> +			    unsigned long *config)
> +{
> +	enum pin_config_param param = pinconf_to_config_param(*config);
> +	struct eq5p_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
> +	unsigned int reg, val_pd, val_pu, val_ds;
> +	bool pd, pu;
> +	u32 arg = 0;
> +
> +	regmap_read(pctrl->olb, pctrl->regs[EQ5P_PD], &val_pd);
> +	pd = (val_pd & BIT(offset)) != 0;
> +	regmap_read(pctrl->olb, pctrl->regs[EQ5P_PU], &val_pu);
> +	pu = (val_pu & BIT(offset)) != 0;
> +
> +	switch (param) {
> +	case PIN_CONFIG_BIAS_DISABLE:
> +		arg = !(pd || pu);
> +		break;
> +	case PIN_CONFIG_BIAS_PULL_DOWN:
> +		arg = pd;
> +		break;
> +	case PIN_CONFIG_BIAS_PULL_UP:
> +		arg = pu;
> +		break;
> +	case PIN_CONFIG_DRIVE_STRENGTH:
> +		offset *= 2; /* two bits per pin */
> +		if (offset >= 32) {
> +			reg = pctrl->regs[EQ5P_DS_HIGH];
> +			offset -= 32;
> +		} else {
> +			reg = pctrl->regs[EQ5P_DS_LOW];
> +		}
> +		regmap_read(pctrl->olb, reg, &val_ds);
> +		arg = (val_ds >> offset) & 0b11;
> +		break;
> +	default:
> +		return -EOPNOTSUPP;
> +	}
> +
> +	*config = pinconf_to_config_packed(param, arg);
> +	return 0;
> +}
> +
> +static int eq5p_pinconf_set_drive_strength(struct pinctrl_dev *pctldev,
> +					   unsigned int offset, u32 arg)
> +{
> +	struct eq5p_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
> +	unsigned int reg, mask, val;
> +
> +	if (arg > 3) {
> +		dev_err(pctldev->dev, "Unsupported drive strength: %u\n", arg);
> +		return -EINVAL;
> +	}
> +
> +	offset *= 2; /* two bits per pin */
> +
> +	if (offset >= 32) {
> +		reg = pctrl->regs[EQ5P_DS_HIGH];
> +		offset -= 32;
> +	} else {
> +		reg = pctrl->regs[EQ5P_DS_LOW];
> +	}
> +
> +	mask = 0b11 << offset;
> +	val = arg << offset;
> +	regmap_update_bits(pctrl->olb, reg, mask, val);
> +	return 0;
> +}
> +
> +static int eq5p_pinconf_set(struct pinctrl_dev *pctldev, unsigned int offset,
> +			    unsigned long *configs, unsigned int num_configs)
> +{
> +	struct eq5p_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
> +	const char *pin_name = pctldev->desc->pins[offset].name;
> +	struct device *dev = pctldev->dev;
> +	unsigned int i, val, reg_pd, reg_pu;
> +
> +	val = BIT(offset);
> +	reg_pd = pctrl->regs[EQ5P_PD];
> +	reg_pu = pctrl->regs[EQ5P_PU];
> +
> +	for (i = 0; i < num_configs; i++) {
> +		enum pin_config_param param = pinconf_to_config_param(configs[i]);
> +		u32 arg = pinconf_to_config_argument(configs[i]);
> +
> +		switch (param) {
> +		case PIN_CONFIG_BIAS_DISABLE:
> +			dev_dbg(dev, "%s: pin=%s BIAS_DISABLE\n",
> +				__func__, pin_name);
> +			regmap_clear_bits(pctrl->olb, reg_pd, val);
> +			regmap_clear_bits(pctrl->olb, reg_pu, val);
> +			break;
> +		case PIN_CONFIG_BIAS_PULL_DOWN:
> +			dev_dbg(dev, "%s: pin=%s BIAS_PULL_DOWN arg=%u\n",
> +				__func__, pin_name, arg);
> +			if (arg == 0) /* cannot connect to GND */
> +				return -EOPNOTSUPP;
> +			regmap_set_bits(pctrl->olb, reg_pd, val);
> +			regmap_clear_bits(pctrl->olb, reg_pu, val);
> +			break;
> +		case PIN_CONFIG_BIAS_PULL_UP:
> +			dev_dbg(dev, "%s: pin=%s BIAS_PULL_UP arg=%u\n",
> +				__func__, pin_name, arg);
> +			if (arg == 0) /* cannot connect to VDD */
> +				return -EOPNOTSUPP;
> +			regmap_clear_bits(pctrl->olb, reg_pd, val);
> +			regmap_set_bits(pctrl->olb, reg_pu, val);
> +			break;
> +		case PIN_CONFIG_DRIVE_STRENGTH:
> +			dev_dbg(dev, "%s: pin=%s DRIVE_STRENGTH arg=%u\n",
> +				__func__, pin_name, arg);
> +			eq5p_pinconf_set_drive_strength(pctldev, offset, arg);
> +			break;
> +		default:
> +			dev_err(dev, "Unsupported pinconf %u\n", param);
> +			return -EOPNOTSUPP;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct pinconf_ops eq5p_pinconf_ops = {
> +	.is_generic = true,
> +	.pin_config_get = eq5p_pinconf_get,
> +	.pin_config_set = eq5p_pinconf_set,
> +	/* Pins and groups are equivalent in this driver. */
> +	.pin_config_group_get = eq5p_pinconf_get,
> +	.pin_config_group_set = eq5p_pinconf_set,
> +};
> +
> +/*
> + * Comments to the right of each pin are the "signal name" in the datasheet.
> + */
> +
> +static const struct pinctrl_pin_desc eq5p_pins_a[] = { /* Bank A */
> +	PINCTRL_PIN(0,  "PA0"),  /* A0_TIMER0_CK */
> +	PINCTRL_PIN(1,  "PA1"),  /* A1_TIMER0_EOC */
> +	PINCTRL_PIN(2,  "PA2"),  /* A2_TIMER1_CK */
> +	PINCTRL_PIN(3,  "PA3"),  /* A3_TIMER1_EOC */
> +	PINCTRL_PIN(4,  "PA4"),  /* A4_TIMER2_CK */
> +	PINCTRL_PIN(5,  "PA5"),  /* A5_TIMER2_EOC */
> +	PINCTRL_PIN(6,  "PA6"),  /* A6_TIMER5_EXT_INCAP1 */
> +	PINCTRL_PIN(7,  "PA7"),  /* A7_TIMER5_EXT_INCAP2 */
> +	PINCTRL_PIN(8,  "PA8"),  /* A8_TIMER5_EXT_OUTCMP1 */
> +	PINCTRL_PIN(9,  "PA9"),  /* A9_TIMER5_EXT_OUTCMP2 */
> +	PINCTRL_PIN(10, "PA10"), /* A10_UART_0_TX */
> +	PINCTRL_PIN(11, "PA11"), /* A11_UART_0_RX */
> +	PINCTRL_PIN(12, "PA12"), /* A12_UART_1_TX */
> +	PINCTRL_PIN(13, "PA13"), /* A13_UART_1_RX */
> +	PINCTRL_PIN(14, "PA14"), /* A14_CAN_0_TX */
> +	PINCTRL_PIN(15, "PA15"), /* A15_CAN_0_RX */
> +	PINCTRL_PIN(16, "PA16"), /* A16_CAN_1_TX */
> +	PINCTRL_PIN(17, "PA17"), /* A17_CAN_1_RX */
> +	PINCTRL_PIN(18, "PA18"), /* A18_SPI_0_DO */
> +	PINCTRL_PIN(19, "PA19"), /* A19_SPI_0_DI */
> +	PINCTRL_PIN(20, "PA20"), /* A20_SPI_0_CK */
> +	PINCTRL_PIN(21, "PA21"), /* A21_SPI_0_CS0 */
> +	PINCTRL_PIN(22, "PA22"), /* A22_SPI_0_CS1 */
> +	PINCTRL_PIN(23, "PA23"), /* A23_SPI_1_DO */
> +	PINCTRL_PIN(24, "PA24"), /* A24_SPI_1_DI */
> +	PINCTRL_PIN(25, "PA25"), /* A25_SPI_1_CK */
> +	PINCTRL_PIN(26, "PA26"), /* A26_SPI_1_CS0 */
> +	PINCTRL_PIN(27, "PA27"), /* A27_SPI_1_CS1 */
> +	PINCTRL_PIN(28, "PA28"), /* A28_REF_CLK0 */
> +};
> +
> +static const struct pinctrl_pin_desc eq5p_pins_b[] = { /* Bank B */
> +	PINCTRL_PIN(0,  "PB0"),  /* B0_TIMER3_CK */
> +	PINCTRL_PIN(1,  "PB1"),  /* B1_TIMER3_EOC */
> +	PINCTRL_PIN(2,  "PB2"),  /* B2_TIMER4_CK */
> +	PINCTRL_PIN(3,  "PB3"),  /* B3_TIMER4_EOC */
> +	PINCTRL_PIN(4,  "PB4"),  /* B4_TIMER6_EXT_INCAP1 */
> +	PINCTRL_PIN(5,  "PB5"),  /* B5_TIMER6_EXT_INCAP2 */
> +	PINCTRL_PIN(6,  "PB6"),  /* B6_TIMER6_EXT_OUTCMP1 */
> +	PINCTRL_PIN(7,  "PB7"),  /* B7_TIMER6_EXT_OUTCMP2 */
> +	PINCTRL_PIN(8,  "PB8"),  /* B8_UART_2_TX */
> +	PINCTRL_PIN(9,  "PB9"),  /* B9_UART_2_RX */
> +	PINCTRL_PIN(10, "PB10"), /* B10_CAN_2_TX */
> +	PINCTRL_PIN(11, "PB11"), /* B11_CAN_2_RX */
> +	PINCTRL_PIN(12, "PB12"), /* B12_SPI_2_DO */
> +	PINCTRL_PIN(13, "PB13"), /* B13_SPI_2_DI */
> +	PINCTRL_PIN(14, "PB14"), /* B14_SPI_2_CK */
> +	PINCTRL_PIN(15, "PB15"), /* B15_SPI_2_CS0 */
> +	PINCTRL_PIN(16, "PB16"), /* B16_SPI_2_CS1 */
> +	PINCTRL_PIN(17, "PB17"), /* B17_SPI_3_DO */
> +	PINCTRL_PIN(18, "PB18"), /* B18_SPI_3_DI */
> +	PINCTRL_PIN(19, "PB19"), /* B19_SPI_3_CK */
> +	PINCTRL_PIN(20, "PB20"), /* B20_SPI_3_CS0 */
> +	PINCTRL_PIN(21, "PB21"), /* B21_SPI_3_CS1 */
> +	PINCTRL_PIN(22, "PB22"), /* B22_MCLK0 */
> +};
> +
> +/* Groups of functions on bank A */
> +static const char * const gpioa_groups[] = {
> +	"PA0", "PA1", "PA2", "PA3", "PA4", "PA5", "PA6", "PA7", "PA8", "PA9",
> +	"PA10", "PA11", "PA12", "PA13", "PA14", "PA15", "PA16", "PA17", "PA18",
> +	"PA19", "PA20", "PA21", "PA22", "PA23", "PA24", "PA25", "PA26", "PA27",
> +	"PA28",
> +};
> +static const char * const timer0_groups[] = { "PA0", "PA1" };
> +static const char * const timer1_groups[] = { "PA2", "PA3" };
> +static const char * const timer2_groups[] = { "PA4", "PA5" };
> +static const char * const timer5_groups[] = { "PA6", "PA7", "PA8", "PA9" };
> +static const char * const uart0_groups[] = { "PA10", "PA11" };
> +static const char * const uart1_groups[] = { "PA12", "PA13" };
> +static const char * const can0_groups[] = { "PA14", "PA15" };
> +static const char * const can1_groups[] = { "PA16", "PA17" };
> +static const char * const spi0_groups[] = { "PA18", "PA19", "PA20", "PA21", "PA22" };
> +static const char * const spi1_groups[] = { "PA23", "PA24", "PA25", "PA26", "PA27" };
> +static const char * const refclk0_groups[] = { "PA28" };
> +
> +/* Groups of functions on bank B */
> +static const char * const gpiob_groups[] = {
> +	"PB0", "PB1", "PB2", "PB3", "PB4", "PB5", "PB6", "PB7", "PB8", "PB9",
> +	"PB10", "PB11", "PB12", "PB13", "PB14", "PB15", "PB16", "PB17", "PB18",
> +	"PB19", "PB20", "PB21", "PB22",
> +};
> +static const char * const timer3_groups[] = { "PB0", "PB1" };
> +static const char * const timer4_groups[] = { "PB2", "PB3" };
> +static const char * const timer6_groups[] = { "PB4", "PB5", "PB6", "PB7" };
> +static const char * const uart2_groups[] = { "PB8", "PB9" };
> +static const char * const can2_groups[] = { "PB10", "PB11" };
> +static const char * const spi2_groups[] = { "PB12", "PB13", "PB14", "PB15", "PB16" };
> +static const char * const spi3_groups[] = { "PB17", "PB18", "PB19", "PB20", "PB21" };
> +static const char * const mclk0_groups[] = { "PB22" };
> +
> +#define FUNCTION(a, b) { .name = a, .groups = b, .ngroups = ARRAY_SIZE(b) }
> +
> +static const struct eq5p_function eq5p_functions_a[] = {
> +	/* GPIO having a fixed index is depended upon, see GPIO_FUNC_SELECTOR. */
> +	FUNCTION("gpio", gpioa_groups),
> +
> +	FUNCTION("timer0", timer0_groups),
> +	FUNCTION("timer1", timer1_groups),
> +	FUNCTION("timer2", timer2_groups),
> +	FUNCTION("timer5", timer5_groups),
> +	FUNCTION("uart0", uart0_groups),
> +	FUNCTION("uart1", uart1_groups),
> +	FUNCTION("can0", can0_groups),
> +	FUNCTION("can1", can1_groups),
> +	FUNCTION("spi0", spi0_groups),
> +	FUNCTION("spi1", spi1_groups),
> +	FUNCTION("refclk0", refclk0_groups),
> +};
> +
> +static const struct eq5p_function eq5p_functions_b[] = {
> +	/* GPIO having a fixed index is depended upon, see GPIO_FUNC_SELECTOR. */
> +	FUNCTION("gpio", gpiob_groups),
> +
> +	FUNCTION("timer3", timer3_groups),
> +	FUNCTION("timer4", timer4_groups),
> +	FUNCTION("timer6", timer6_groups),
> +	FUNCTION("uart2", uart2_groups),
> +	FUNCTION("can2", can2_groups),
> +	FUNCTION("spi2", spi2_groups),
> +	FUNCTION("spi3", spi3_groups),
> +	FUNCTION("mclk0", mclk0_groups),
> +};
> +
> +struct eq5p_match {
> +	unsigned int regs[EQ5P_REG_MAX];
> +	const struct pinctrl_pin_desc *pins;
> +	unsigned int npins;
> +	const struct eq5p_function *funcs;
> +	unsigned int nfuncs;
> +};
> +
> +static int eq5p_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct device_node *np = dev->of_node;
> +	struct device_node *parent_np = of_get_parent(np);
> +	const struct eq5p_match *match = of_device_get_match_data(dev);
> +	struct pinctrl_dev *pctldev;
> +	struct eq5p_pinctrl *pctrl;
> +	int ret;
> +
> +	pctrl = devm_kzalloc(dev, sizeof(*pctrl), GFP_KERNEL);
> +	if (!pctrl)
> +		return -ENOMEM;
> +
> +	pctrl->olb = ERR_PTR(-ENODEV);
> +	if (parent_np)
> +		pctrl->olb = syscon_node_to_regmap(parent_np);
> +	if (IS_ERR(pctrl->olb))
> +		pctrl->olb = syscon_regmap_lookup_by_phandle(np, "mobileye,olb");
> +	if (IS_ERR(pctrl->olb))
> +		return PTR_ERR(pctrl->olb);
> +
> +	pctrl->regs = match->regs;
> +	pctrl->funcs = match->funcs;
> +	pctrl->nfuncs = match->nfuncs;
> +
> +	pctrl->desc.name = dev_name(dev);
> +	pctrl->desc.pins = match->pins;
> +	pctrl->desc.npins = match->npins;
> +	pctrl->desc.pctlops = &eq5p_pinctrl_ops;
> +	pctrl->desc.pmxops = &eq5p_pinmux_ops;
> +	pctrl->desc.confops = &eq5p_pinconf_ops;
> +	pctrl->desc.owner = THIS_MODULE;
> +
> +	ret = devm_pinctrl_register_and_init(dev, &pctrl->desc, pctrl, &pctldev);
> +	if (ret) {
> +		dev_err(dev, "Failed registering pinctrl device: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = pinctrl_enable(pctldev);
> +	if (ret) {
> +		dev_err(dev, "Failed enabling pinctrl device: %d\n", ret);
> +		return ret;
> +	}
> +
> +	dev_info(dev, "probed\n");
> +
> +	return 0;
> +}
> +
> +static const struct eq5p_match eq5p_match_a = {
> +	.regs = {
> +		[EQ5P_PD] = 0x0C0,
> +		[EQ5P_PU] = 0x0C4,
> +		[EQ5P_DS_LOW] = 0x0D0,
> +		[EQ5P_DS_HIGH] = 0x0D4,
> +		[EQ5P_IOCR] = 0x0B0,
> +	},
> +	.pins = eq5p_pins_a,
> +	.npins = ARRAY_SIZE(eq5p_pins_a),
> +	.funcs = eq5p_functions_a,
> +	.nfuncs = ARRAY_SIZE(eq5p_functions_a),
> +};
> +
> +static const struct eq5p_match eq5p_match_b = {
> +	.regs = {
> +		[EQ5P_PD] = 0x0C8,
> +		[EQ5P_PU] = 0x0CC,
> +		[EQ5P_DS_LOW] = 0x0D8,
> +		[EQ5P_DS_HIGH] = 0x0DC,
> +		[EQ5P_IOCR] = 0x0B4,
> +	},

These are all the same relative offsets, so you really only need to 
store the base offset.

The use of 2 compatibles is a bit questionable as the programming model 
appears to be the same and only which pins differ. Surely there are 
some other pinctrl drivers handling mutiple instances.

Rob