Message-ID: <1b6e8bf7-fc11-542b-f570-cebb0b6c3442@ti.com>
Date:   Wed, 26 Aug 2020 06:52:20 -0500
From:   Dan Murphy <dmurphy@...com>
To:     Gene Chen <gene.chen.richtek@...il.com>,
        <jacek.anaszewski@...il.com>, <pavel@....cz>,
        <matthias.bgg@...il.com>
CC:     <linux-leds@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <gene_chen@...htek.com>,
        <Wilma.Wu@...iatek.com>, <shufan_lee@...htek.com>,
        <cy_huang@...htek.com>, <benjamin.chao@...iatek.com>
Subject: Re: [PATCH 1/2] leds: mt6360: Add LED driver for MT6360

Hello

On 8/26/20 6:37 AM, Gene Chen wrote:
> From: Gene Chen <gene_chen@...htek.com>
>
> Add MT6360 LED driver include 2-channel Flash LED with torch/strobe mode,
> and 4-channel RGB LED support Register/Flash/Breath Mode

> Signed-off-by: Gene Chen <gene_chen@...htek.com>
> ---
>   drivers/leds/Kconfig       |  11 +
>   drivers/leds/Makefile      |   1 +
>   drivers/leds/leds-mt6360.c | 680 +++++++++++++++++++++++++++++++++++++++++++++
>   3 files changed, 692 insertions(+)
>   create mode 100644 drivers/leds/leds-mt6360.c
>
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index 1c181df..ce95ead 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -271,6 +271,17 @@ config LEDS_MT6323
>   	  This option enables support for on-chip LED drivers found on
>   	  Mediatek MT6323 PMIC.
>   
> +config LEDS_MT6360
> +	tristate "LED Support for Mediatek MT6360 PMIC"
> +	depends on LEDS_CLASS_FLASH && OF
> +	depends on V4L2_FLASH_LED_CLASS || !V4L2_FLASH_LED_CLASS
> +	depends on MFD_MT6360
> +	help
> +	  This option enables support for dual Flash LED drivers found on
> +	  Mediatek MT6360 PMIC.
> +	  Support Torch and Strobe mode independently current source.
> +	  Include Low-VF and short protection.
> +
>   config LEDS_S3C24XX
>   	tristate "LED Support for Samsung S3C24XX GPIO LEDs"
>   	depends on LEDS_CLASS
> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> index c2c7d7a..5596427 100644
> --- a/drivers/leds/Makefile
> +++ b/drivers/leds/Makefile
> @@ -66,6 +66,7 @@ obj-$(CONFIG_LEDS_MIKROTIK_RB532)	+= leds-rb532.o
>   obj-$(CONFIG_LEDS_MLXCPLD)		+= leds-mlxcpld.o
>   obj-$(CONFIG_LEDS_MLXREG)		+= leds-mlxreg.o
>   obj-$(CONFIG_LEDS_MT6323)		+= leds-mt6323.o
> +obj-$(CONFIG_LEDS_MT6360)		+= leds-mt6360.o
>   obj-$(CONFIG_LEDS_NET48XX)		+= leds-net48xx.o
>   obj-$(CONFIG_LEDS_NETXBIG)		+= leds-netxbig.o
>   obj-$(CONFIG_LEDS_NIC78BX)		+= leds-nic78bx.o
> diff --git a/drivers/leds/leds-mt6360.c b/drivers/leds/leds-mt6360.c
> new file mode 100644
> index 0000000..3d89b59
> --- /dev/null
> +++ b/drivers/leds/leds-mt6360.c
> @@ -0,0 +1,680 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2019 MediaTek Inc.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/led-class-flash.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/property.h>
> +#include <linux/regmap.h>
> +#include <media/v4l2-flash-led-class.h>
> +
> +enum {
> +	MT6360_LED_ISNK1 = 0,
> +	MT6360_LED_ISNK2,
> +	MT6360_LED_ISNK3,
> +	MT6360_LED_ISNK4,
> +	MT6360_LED_FLASH1,
> +	MT6360_LED_FLASH2,
> +	MT6360_MAX_LEDS,
> +};
> +
> +#define MT6360_REG_RGBEN		0x380
> +#define MT6360_REG_ISNK(_led_no)	(0x381 + (_led_no))
> +#define MT6360_ISNK_ENMASK(_led_no)	BIT(7 - (_led_no))
> +#define MT6360_ISNK_MASK		0x1F
> +#define MT6360_CHRINDSEL_MASK		BIT(3)
> +
> +#define MT6360_REG_FLEDEN		0x37E
> +#define MT6360_REG_STRBTO		0x373
> +#define MT6360_REG_FLEDBASE(_id)	(0x372 + 4 * (_id - MT6360_LED_FLASH1))
> +#define MT6360_REG_FLEDISTRB(_id)	(MT6360_REG_FLEDBASE(_id) + 2)
> +#define MT6360_REG_FLEDITOR(_id)	(MT6360_REG_FLEDBASE(_id) + 3)
> +#define MT6360_REG_CHGSTAT2		0x3E1
> +#define MT6360_REG_FLEDSTAT1		0x3E9
> +#define MT6360_ITORCH_MASK		0x1F
> +#define MT6360_ISTROBE_MASK		0x7F
> +#define MT6360_STRBTO_MASK		0x7F
Please use GENMASK macro for mask with multiple bits
> +#define MT6360_TORCHEN_MASK		BIT(3)
> +#define MT6360_STROBEN_MASK		BIT(2)
> +#define MT6360_FLCSEN_MASK(_id)		BIT(MT6360_LED_FLASH2 - _id)
> +#define MT6360_FLEDCHGVINOVP_MASK	BIT(3)
> +#define MT6360_FLED1STRBTO_MASK		BIT(11)
> +#define MT6360_FLED2STRBTO_MASK		BIT(10)
> +#define MT6360_FLED1STRB_MASK		BIT(9)
> +#define MT6360_FLED2STRB_MASK		BIT(8)
> +#define MT6360_FLED1SHORT_MASK		BIT(7)
> +#define MT6360_FLED2SHORT_MASK		BIT(6)
> +#define MT6360_FLEDLVF_MASK		BIT(3)
> +
> +/* 0 means led_off, add one for dummy */
> +#define MT6360_ISNK1_MAXLEVEL		13
> +#define MT6360_ISNK4_MAXLEVEL		31
> +
> +#define MT6360_ITORCH_MIN		25000
> +#define MT6360_ITORCH_STEP		12500
> +#define MT6360_ITORCH_MAX		400000
> +#define MT6360_ISTRB_MIN		50000
> +#define MT6360_ISTRB_STEP		12500
> +#define MT6360_ISTRB_MAX		1500000
> +#define MT6360_STRBTO_MIN		64000
> +#define MT6360_STRBTO_STEP		32000
> +#define MT6360_STRBTO_MAX		2432000
> +
> +#define FLED_TORCH_FLAG_MASK		0x0c
> +#define FLED_TORCH_FLAG_SHFT		2
> +#define FLED_STROBE_FLAG_MASK		0x03
> +
> +#define STATE_OFF			0
> +#define STATE_KEEP			1
> +#define STATE_ON			2
> +
> +struct mt6360_led {
> +	union {
> +		struct led_classdev isnk;
> +		struct led_classdev_flash flash;
> +	};
> +	struct v4l2_flash *v4l2_flash;
> +	struct mt6360_priv *priv;
> +	u32 led_no;
> +	u32 default_state;
> +	bool active;
> +};
> +
> +struct mt6360_priv {
> +	struct device *dev;
> +	struct regmap *regmap;
> +	struct mt6360_led leds[MT6360_MAX_LEDS];
> +	unsigned int fled_strobe_used;
> +	unsigned int fled_torch_used;
> +};
> +
> +static int mt6360_isnk_brightness_set(struct led_classdev *lcdev, enum led_brightness level)
> +{
> +	struct mt6360_led *led = container_of(lcdev, struct mt6360_led, isnk);
> +	struct mt6360_priv *priv = led->priv;
> +	u32 enable_mask = MT6360_ISNK_ENMASK(led->led_no);
> +	u32 val = level ? MT6360_ISNK_ENMASK(led->led_no) : 0;
> +	int ret;
> +
> +	dev_dbg(lcdev->dev, "[%d] brightness %d\n", led->led_no, level);
> +
> +	if (level) {
> +		ret = regmap_update_bits(priv->regmap, MT6360_REG_ISNK(led->led_no),
> +					 MT6360_ISNK_MASK, level - 1);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	ret = regmap_update_bits(priv->regmap, MT6360_REG_RGBEN, enable_mask, val);
> +	if (ret)
> +		return ret;
> +
> +	return 0;
> +}
> +
> +static int mt6360_torch_brightness_set(struct led_classdev *lcdev, enum led_brightness level)
> +{
> +	struct mt6360_led *led = container_of(lcdev, struct mt6360_led, flash.led_cdev);
> +	struct mt6360_priv *priv = led->priv;
> +	u32 enable_mask = MT6360_TORCHEN_MASK | MT6360_FLCSEN_MASK(led->led_no);
> +	u32 val = (level) ? MT6360_FLCSEN_MASK(led->led_no) : 0;
> +	u32 prev = priv->fled_torch_used, curr;
> +	int ret;
> +
> +	dev_dbg(lcdev->dev, "[%d] brightness %d\n", led->led_no, level);
> +	if (priv->fled_strobe_used) {
> +		dev_warn(lcdev->dev, "Please disable strobe first [%d]\n", priv->fled_strobe_used);
> +		return -EINVAL;
> +	}
> +
> +	if (level)
> +		curr = prev | BIT(led->led_no);
> +	else
> +		curr = prev & (~BIT(led->led_no));
> +
> +	if (curr)
> +		val |= MT6360_TORCHEN_MASK;
> +
> +	if (level) {
> +		ret = regmap_update_bits(priv->regmap, MT6360_REG_FLEDITOR(led->led_no),
> +					 MT6360_ITORCH_MASK, level - 1);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	ret = regmap_update_bits(priv->regmap, MT6360_REG_FLEDEN, enable_mask, val);
> +	if (ret)
> +		return ret;
> +
> +	priv->fled_torch_used = curr;
> +
> +	return 0;
> +}
> +
> +static int mt6360_strobe_brightness_set(struct led_classdev_flash *fl_cdev, u32 brightness)
> +{
> +	struct mt6360_led *led = container_of(fl_cdev, struct mt6360_led, flash);
> +	struct led_classdev *lcdev = &fl_cdev->led_cdev;
> +
> +	dev_dbg(lcdev->dev, "[%d] strobe brightness %d\n", led->led_no, brightness);
> +	return 0;
> +}
> +
> +static int _mt6360_strobe_brightness_set(struct led_classdev_flash *fl_cdev, u32 brightness)
> +{
> +	struct mt6360_led *led = container_of(fl_cdev, struct mt6360_led, flash);
> +	struct mt6360_priv *priv = led->priv;
> +	struct led_flash_setting *s = &fl_cdev->brightness;
> +	u32 val = (brightness - s->min) / s->step;
> +
> +	return regmap_update_bits(priv->regmap, MT6360_REG_FLEDISTRB(led->led_no),
> +				 MT6360_ISTROBE_MASK, val);
> +}
> +
> +static int mt6360_strobe_set(struct led_classdev_flash *fl_cdev, bool state)
> +{
> +	struct mt6360_led *led = container_of(fl_cdev, struct mt6360_led, flash);
> +	struct mt6360_priv *priv = led->priv;
> +	struct led_classdev *lcdev = &fl_cdev->led_cdev;
> +	struct led_flash_setting *s = &fl_cdev->brightness;
> +	u32 enable_mask = MT6360_STROBEN_MASK | MT6360_FLCSEN_MASK(led->led_no);
> +	u32 val = state ? MT6360_FLCSEN_MASK(led->led_no) : 0;
> +	u32 prev = priv->fled_strobe_used, curr;
> +	int ret;
> +
> +	dev_dbg(lcdev->dev, "[%d] strobe state %d\n", led->led_no, state);
> +	if (priv->fled_torch_used) {
> +		dev_warn(lcdev->dev, "Please disable torch first [0x%x]\n", priv->fled_torch_used);
> +		return -EINVAL;
> +	}
> +
> +	if (state)
> +		curr = prev | BIT(led->led_no);
> +	else
> +		curr = prev & (~BIT(led->led_no));
> +
> +	if (curr)
> +		val |= MT6360_STROBEN_MASK;
> +
> +	ret = regmap_update_bits(priv->regmap, MT6360_REG_FLEDEN, enable_mask, val);
> +	if (ret) {
> +		dev_err(lcdev->dev, "[%d] control current source %d fail\n", led->led_no, state);
> +		return ret;
> +	}
> +
> +	/* used to prevent flash current spike when torch on */
> +	ret = _mt6360_strobe_brightness_set(fl_cdev, state ? s->val : s->min);
> +	if (ret)
> +		return ret;
> +
> +	if (!prev && curr)
> +		usleep_range(5000, 6000);
> +	else if (prev && !curr)
> +		udelay(500);
> +
> +	priv->fled_strobe_used = curr;
> +	return 0;
> +}
> +
> +static int mt6360_strobe_get(struct led_classdev_flash *fl_cdev, bool *state)
> +{
> +	struct mt6360_led *led = container_of(fl_cdev, struct mt6360_led, flash);
> +	struct mt6360_priv *priv = led->priv;
> +
> +	*state = !!(priv->fled_strobe_used & BIT(led->led_no));
> +	return 0;
> +}
> +
> +static int mt6360_timeout_set(struct led_classdev_flash *fl_cdev, u32 timeout)
> +{
> +	struct mt6360_led *led = container_of(fl_cdev, struct mt6360_led, flash);
> +	struct mt6360_priv *priv = led->priv;
> +	struct led_flash_setting *s = &fl_cdev->timeout;
> +	u32 val = (timeout - s->min) / s->step;
> +
> +	return regmap_update_bits(priv->regmap, MT6360_REG_STRBTO, MT6360_STRBTO_MASK, val);
> +
> +}
> +
> +static int mt6360_fault_get(struct led_classdev_flash *fl_cdev, u32 *fault)
> +{
> +	struct mt6360_led *led = container_of(fl_cdev, struct mt6360_led, flash);
> +	struct mt6360_priv *priv = led->priv;
> +	u16 fled_stat;
> +	unsigned int chg_stat, strobe_timeout_mask, fled_short_mask;
> +	u32 rfault = 0;
> +	int ret;
> +
> +	ret = regmap_read(priv->regmap, MT6360_REG_CHGSTAT2, &chg_stat);
> +	if (ret)
> +		return ret;
> +
> +	ret = regmap_raw_read(priv->regmap, MT6360_REG_FLEDSTAT1, &fled_stat, sizeof(fled_stat));
> +	if (ret)
> +		return ret;
> +
> +	if (led->led_no == MT6360_LED_FLASH1) {
> +		strobe_timeout_mask = MT6360_FLED1STRBTO_MASK;
> +		fled_short_mask = MT6360_FLED1SHORT_MASK;
> +
> +	} else {
> +		strobe_timeout_mask = MT6360_FLED2STRBTO_MASK;
> +		fled_short_mask = MT6360_FLED2SHORT_MASK;
> +	}
> +
> +	if (chg_stat & MT6360_FLEDCHGVINOVP_MASK)
> +		rfault |= LED_FAULT_INPUT_VOLTAGE;
> +
> +	if (fled_stat & strobe_timeout_mask)
> +		rfault |= LED_FAULT_TIMEOUT;
> +
> +	if (fled_stat & fled_short_mask)
> +		rfault |= LED_FAULT_SHORT_CIRCUIT;
> +
> +	if (fled_stat & MT6360_FLEDLVF_MASK)
> +		rfault |= LED_FAULT_UNDER_VOLTAGE;
> +
> +	*fault = rfault;
> +	return 0;
> +}
> +
> +static const struct led_flash_ops mt6360_flash_ops = {
> +	.flash_brightness_set = mt6360_strobe_brightness_set,
> +	.strobe_set = mt6360_strobe_set,
> +	.strobe_get = mt6360_strobe_get,
> +	.timeout_set = mt6360_timeout_set,
> +	.fault_get = mt6360_fault_get,
> +};
> +
> +static int mt6360_isnk_init_default_state(struct mt6360_led *led)
> +{
> +	struct mt6360_priv *priv = led->priv;
> +	unsigned int regval;
> +	u32 level;
> +	int ret;
> +
> +	ret = regmap_read(priv->regmap, MT6360_REG_ISNK(led->led_no), &regval);
> +	if (ret)
> +		return ret;
> +	level = regval & MT6360_ISNK_MASK;
> +
> +	ret = regmap_read(priv->regmap, MT6360_REG_RGBEN, &regval);
> +	if (ret)
> +		return ret;
> +
> +	if (regval & MT6360_ISNK_ENMASK(led->led_no))
> +		level += 1;
> +	else
> +		level = LED_OFF;
> +
> +	switch (led->default_state) {
> +	case STATE_ON:
> +		led->isnk.brightness = led->isnk.max_brightness;
> +		break;
> +	case STATE_KEEP:
> +		led->isnk.brightness = min(level, led->isnk.max_brightness);
> +		break;
> +	default:
> +		led->isnk.brightness = LED_OFF;
> +	}
> +
> +	return mt6360_isnk_brightness_set(&led->isnk, led->isnk.brightness);
> +}
> +
> +static int mt6360_isnk_register(struct device *parent, struct mt6360_led *led,
> +				struct led_init_data *init_data)
> +{
> +	struct mt6360_priv *priv = led->priv;
> +	int ret;
> +
> +	if (led->led_no == MT6360_LED_ISNK1) {
> +		/* change isink to sw mode */
> +		ret = regmap_update_bits(priv->regmap, MT6360_REG_RGBEN, MT6360_CHRINDSEL_MASK,
> +					 MT6360_CHRINDSEL_MASK);
> +		if (ret) {
> +			dev_err(parent, "Failed to config ISNK1 to SW mode\n");
> +			return ret;
> +		}
> +	}
> +
> +	ret = mt6360_isnk_init_default_state(led);
> +	if (ret) {
> +		dev_err(parent, "Failed to init %d isnk state\n", led->led_no);
> +		return ret;
> +	}
> +
> +	ret = devm_led_classdev_register_ext(parent, &led->isnk, init_data);
> +	if (ret) {
> +		dev_err(parent, "Couldn't register isink %d\n", led->led_no);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int mt6360_flash_init_default_state(struct mt6360_led *led)
> +{
> +	struct led_classdev_flash *flash = &led->flash;
> +	struct mt6360_priv *priv = led->priv;
> +	u32 enable_mask = MT6360_TORCHEN_MASK | MT6360_FLCSEN_MASK(led->led_no);
> +	u32 level;
> +	unsigned int regval;
> +	int ret;
> +
> +	ret = regmap_read(priv->regmap, MT6360_REG_FLEDITOR(led->led_no), &regval);
> +	if (ret)
> +		return ret;
> +	level = regval & MT6360_ITORCH_MASK;
> +
> +	ret = regmap_read(priv->regmap, MT6360_REG_FLEDEN, &regval);
> +	if (ret)
> +		return ret;
> +
> +	if ((regval & enable_mask) == enable_mask)
if (regval & enable_mask)
> +		level += 1;
> +	else
> +		level = LED_OFF;
> +
> +	switch (led->default_state) {
> +	case STATE_ON:
> +		flash->led_cdev.brightness = flash->led_cdev.max_brightness;
> +		break;
> +	case STATE_KEEP:
> +		flash->led_cdev.brightness = min(level, flash->led_cdev.max_brightness);
> +		break;
> +	default:
> +		flash->led_cdev.brightness = LED_OFF;
> +	}
> +
> +	return mt6360_torch_brightness_set(&flash->led_cdev, flash->led_cdev.brightness);
> +}
> +
> +#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
> +static int mt6360_flash_external_strobe_set(struct v4l2_flash *v4l2_flash, bool enable)
> +{
> +	struct led_classdev_flash *flash = v4l2_flash->fled_cdev;
> +	struct mt6360_led *led = container_of(flash, struct mt6360_led, flash);
> +	struct mt6360_priv *priv = led->priv;
> +	u32 enable_mask = MT6360_FLCSEN_MASK(led->led_no);
> +	int ret;
> +
> +	ret = regmap_update_bits(priv->regmap, MT6360_REG_FLEDEN, enable_mask,
> +				 enable ? enable_mask : 0);
> +	if (ret)
> +		return ret;
> +
> +	if (enable)
> +		priv->fled_strobe_used |= BIT(led->led_no);
> +	else
> +		priv->fled_strobe_used &= (~BIT(led->led_no));
> +
> +	return 0;
> +}
> +
> +static const struct v4l2_flash_ops v4l2_flash_ops = {
> +	.external_strobe_set = mt6360_flash_external_strobe_set,
> +};
> +
> +static void mt6360_flash_init_v4l2_config(struct mt6360_led *led, struct v4l2_flash_config *config)
> +{
> +	struct led_classdev_flash *flash = &led->flash;
> +	struct led_classdev *lcdev = &flash->led_cdev;
> +	struct led_flash_setting *s = &config->intensity;
> +
> +	snprintf(config->dev_name, sizeof(config->dev_name), "%s", lcdev->name);
> +
> +	s->min = MT6360_ITORCH_MIN;
> +	s->step = MT6360_ITORCH_STEP;
> +	s->val = s->max = (s->min) + (lcdev->max_brightness - 1) * s->step;
> +
> +	config->has_external_strobe = 1;
> +}
> +#else
> +static const struct v4l2_flash_ops v4l2_flash_ops;
> +
> +static void mt6360_flash_init_v4l2_config(struct mt6360_led *led, struct v4l2_flash_config *config)
> +{
> +}
> +#endif
> +
> +static int mt6360_flash_register(struct device *parent, struct mt6360_led *led,
> +				 struct led_init_data *init_data)
> +{
> +	struct v4l2_flash_config v4l2_config = {0};
> +	int ret;
> +
> +	ret = mt6360_flash_init_default_state(led);
> +	if (ret) {
> +		dev_err(parent, "Failed to init %d flash state\n", led->led_no);
> +		return ret;
> +	}
> +
> +	ret = devm_led_classdev_flash_register_ext(parent, &led->flash, init_data);
> +	if (ret) {
> +		dev_err(parent, "Couldn't register flash %d\n", led->led_no);
> +		return ret;
> +	}
> +
> +	mt6360_flash_init_v4l2_config(led, &v4l2_config);
> +	led->v4l2_flash = v4l2_flash_init(parent, init_data->fwnode, &led->flash, &v4l2_flash_ops,
> +					  &v4l2_config);
> +	if (IS_ERR(led->v4l2_flash)) {
> +		dev_err(parent, "Failed to register %d v4l2 sd\n", led->led_no);
> +		return PTR_ERR(led->v4l2_flash);
> +	}
> +
> +	return 0;
> +}
> +
> +static inline unsigned int mt6360_get_isnk_max_level(u32 led_no)
> +{
> +	switch (led_no) {
> +	case MT6360_LED_ISNK1 ... MT6360_LED_ISNK3:
> +		return MT6360_ISNK1_MAXLEVEL;
> +	}
> +	return MT6360_ISNK4_MAXLEVEL;
> +}
> +
> +static int mt6360_init_isnk_properties(struct mt6360_led *led, struct led_init_data *init_data)
> +{
> +	struct led_classdev *isnk = &led->isnk;
> +
> +	isnk->max_brightness = mt6360_get_isnk_max_level(led->led_no);
This function is called once seems a bit much to have a service function 
for a simple switch case.
> +	isnk->brightness_set_blocking = mt6360_isnk_brightness_set;
> +
> +	fwnode_property_read_string(init_data->fwnode, "linux,default-trigger",
> +				    &isnk->default_trigger);
> +
> +	return 0;
> +}
> +
> +static void clamp_align(u32 *v, u32 min, u32 max, u32 step)
> +{
> +	*v = clamp_val(*v, min, max);
> +	if (step > 1)
> +		*v = (*v - min) / step * step + min;
> +}
> +
> +static int mt6360_init_flash_properties(struct mt6360_led *led, struct led_init_data *init_data)
> +{
> +	struct led_classdev_flash *flash = &led->flash;
> +	struct led_classdev *lcdev = &flash->led_cdev;
> +	struct led_flash_setting *s;
> +	u32 val;
> +	int ret;
> +
> +	ret = fwnode_property_read_u32(init_data->fwnode, "led-max-microamp", &val);
> +	if (ret)
> +		val = MT6360_ITORCH_MIN;
> +	else
> +		clamp_align(&val, MT6360_ITORCH_MIN, MT6360_ITORCH_MAX, MT6360_ITORCH_STEP);
> +
> +	lcdev->max_brightness = (val - MT6360_ITORCH_MIN) / MT6360_ITORCH_STEP + 1;
> +	lcdev->brightness_set_blocking = mt6360_torch_brightness_set;
> +	lcdev->flags |= LED_DEV_CAP_FLASH;
> +
> +	ret = fwnode_property_read_u32(init_data->fwnode, "flash-max-microamp", &val);
> +	if (ret)
> +		val = MT6360_ISTRB_MIN;
> +	else
> +		clamp_align(&val, MT6360_ISTRB_MIN, MT6360_ISTRB_MAX, MT6360_ISTRB_STEP);
> +
> +	s = &flash->brightness;
> +	s->min = MT6360_ISTRB_MIN;
> +	s->step = MT6360_ISTRB_STEP;
> +	s->val = s->max = val;
> +
> +	/* always configure as min level when off to prevent flash current spike */
> +	ret = _mt6360_strobe_brightness_set(flash, s->min);
> +	if (ret)
> +		return ret;
> +
> +	ret = fwnode_property_read_u32(init_data->fwnode, "flash-max-timeout-us", &val);
> +	if (ret)
> +		val = MT6360_STRBTO_MIN;
> +	else
> +		clamp_align(&val, MT6360_STRBTO_MIN, MT6360_STRBTO_MAX, MT6360_STRBTO_STEP);
> +
> +	s = &flash->timeout;
> +	s->min = MT6360_STRBTO_MIN;
> +	s->step = MT6360_STRBTO_STEP;
> +	s->val = s->max = val;
> +
> +	flash->ops = &mt6360_flash_ops;
> +
> +	return 0;
> +}
> +
> +static int mt6360_init_common_properties(struct mt6360_led *led, struct led_init_data *init_data)
> +{
> +	const char *str;
> +
> +	if (!fwnode_property_read_string(init_data->fwnode, "default-state", &str)) {
> +		if (!strcmp(str, "on"))
> +			led->default_state = STATE_ON;
> +		else if (!strcmp(str, "keep"))
> +			led->default_state = STATE_KEEP;
> +		else
> +			led->default_state = STATE_OFF;
> +	}
> +
> +	return 0;
> +}
> +
> +static int mt6360_led_probe(struct platform_device *pdev)
> +{
> +	struct mt6360_priv *priv;
> +	struct fwnode_handle *child;
> +	int i, ret;
> +
> +	ret = device_get_child_node_count(&pdev->dev);
> +	if (!ret || ret > MT6360_MAX_LEDS)
> +		return -EINVAL;
> +
> +	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);

This does not seem right.  You allocate the MAX_LEDS but you may have 
less seems like wasted memory here

making struct mt6360_led leds[MT6360_MAX_LEDS]; a flexible array and 
using  led = devm_kzalloc(&client->dev, struct_size(led, leds, count),  
GFP_KERNEL);

should help here   There are plenty of examples of this usage

> +	if (!priv)
> +		return -ENOMEM;
> +
> +	priv->dev = &pdev->dev;
> +
> +	priv->regmap = dev_get_regmap(pdev->dev.parent, NULL);
> +	if (!priv->regmap) {
> +		dev_err(&pdev->dev, "Failed to get parent regmap\n");
> +		return -ENODEV;
> +	}
> +
> +	device_for_each_child_node(&pdev->dev, child) {
> +		struct mt6360_led *led;
> +		struct led_init_data init_data = { .fwnode = child, };
> +		u32 reg;
> +
> +		ret = fwnode_property_read_u32(child, "reg", &reg);
> +		if (ret || reg >= MT6360_MAX_LEDS || priv->leds[reg].active) {
> +			ret = -EINVAL;
> +			goto out;
> +		}
> +		led = &priv->leds[reg];

This might be better with an incrementor instead of using the value from 
the device tree.

Unless you are depending on outputs to be mapped to reg numbers in the 
DT.  If so this mapping is not documented in the device tree.

> +
> +		led->active = true;
> +		led->led_no = reg;
> +		led->priv = priv;
> +
> +		ret = mt6360_init_common_properties(led, &init_data);
> +		if (ret)
> +			goto out;
> +
> +		switch (reg) {
> +		case MT6360_LED_ISNK1 ... MT6360_LED_ISNK4:
> +			ret = mt6360_init_isnk_properties(led, &init_data);
> +			if (ret)
> +				goto out;
> +
> +			ret = mt6360_isnk_register(&pdev->dev, led, &init_data);
> +			break;
> +		default:
> +			ret = mt6360_init_flash_properties(led, &init_data);
> +			if (ret)
> +				goto out;
> +
> +			ret = mt6360_flash_register(&pdev->dev, led, &init_data);
> +		}
> +
> +		if (ret)
> +			goto out;
> +	}
> +
> +	platform_set_drvdata(pdev, priv);
> +	return 0;
> +out:
> +	for (i = MT6360_LED_FLASH1; i <= MT6360_LED_FLASH2; i++) {
> +		struct mt6360_led *led = &priv->leds[i];
> +
> +		if (led->v4l2_flash)
> +			v4l2_flash_release(led->v4l2_flash);
> +
> +	}
> +
> +	return ret;
> +}
> +
> +static int mt6360_led_remove(struct platform_device *pdev)
> +{
> +	struct mt6360_priv *priv = platform_get_drvdata(pdev);
> +	int i;
> +
> +	for (i = MT6360_LED_FLASH1; i <= MT6360_LED_FLASH2; i++) {
> +		struct mt6360_led *led = &priv->leds[i];
> +
> +		if (led->v4l2_flash)
> +			v4l2_flash_release(led->v4l2_flash);
> +
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id __maybe_unused mt6360_led_of_id[] = {
> +	{ .compatible = "mediatek,mt6360-led", },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, mt6360_led_of_id);
> +
> +static struct platform_driver mt6360_led_driver = {
> +	.driver = {
> +		.name = "mt6360-led",
> +		.of_match_table = mt6360_led_of_id,
> +	},
> +	.probe = mt6360_led_probe,
> +	.remove = mt6360_led_remove,
> +};
> +module_platform_driver(mt6360_led_driver);
> +
> +MODULE_AUTHOR("CY_Huang <cy_huang@...htek.com>");
> +MODULE_DESCRIPTION("MT6360 Led Driver");
> +MODULE_LICENSE("GPL");

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