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Subject: Re: [PATCH v3 1/2] leds: mt6360: Add LED driver for MT6360
To:     Gene Chen <gene.chen.richtek@gmail.com>, pavel@ucw.cz,
        robh+dt@kernel.org, matthias.bgg@gmail.com
Cc:     dmurphy@ti.com, linux-leds@vger.kernel.org,
        devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org,
        gene_chen@richtek.com, Wilma.Wu@mediatek.com,
        shufan_lee@richtek.com, cy_huang@richtek.com,
        benjamin.chao@mediatek.com
References: <1599474459-20853-1-git-send-email-gene.chen.richtek@gmail.com>
 <1599474459-20853-2-git-send-email-gene.chen.richtek@gmail.com>
From:   Jacek Anaszewski <jacek.anaszewski@gmail.com>
Message-ID: <559a568e-3a2e-33c6-43aa-547a18f8e26b@gmail.com>
Date:   Thu, 10 Sep 2020 23:42:29 +0200
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Hi Gene,

Thanks for the update.

On 9/7/20 12:27 PM, Gene Chen wrote:
> From: Gene Chen <gene_chen@richtek.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@richtek.com>
> ---
>   drivers/leds/Kconfig       |  11 +
>   drivers/leds/Makefile      |   1 +
>   drivers/leds/leds-mt6360.c | 681 +++++++++++++++++++++++++++++++++++++++++++++
>   3 files changed, 693 insertions(+)
>   create mode 100644 drivers/leds/leds-mt6360.c
> 
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index 1c181df..94a6d83 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.
> +	  Independent current sources supply for each flash LED support torch and strobe mode.
> +	  Includes 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..bd6fa48
> --- /dev/null
> +++ b/drivers/leds/leds-mt6360.c
> @@ -0,0 +1,681 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +//
> +// Copyright (C) 2020 MediaTek Inc.
> +//
> +// Author: Gene Chen <gene_chen@richtek.com>
> +
> +#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		GENMASK(4, 0)
> +#define MT6360_ISTROBE_MASK		GENMASK(6, 0)
> +#define MT6360_STRBTO_MASK		GENMASK(6, 0)
> +#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;
> +};
> +
> +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);

Doesn't hardware handle that? IOW, what happens when you have enabled
both torch and flash? If flash just overrides torch mode, than you
should not prevent enabling torch in this case.

> +		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)

s/strobe_brightness_set/flash_brightness_set/

Let's stick to the op name.

> +{
> +	struct mt6360_led *led = container_of(fl_cdev, struct mt6360_led, flash);
> +	struct led_classdev *lcdev = &fl_cdev->led_cdev;

It would be good to add comment here explaining why this function
doesn't do anything.

> +	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)

s/strobe_brightness_set/flash_brightness_set/

> +{
> +	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);

Similar comment as in case of enabling torch mode above.
If flash overrides torch then we're OK without this guard.

> +		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;
> +	}

You probably want also to register V4L2 indicator sub-device.
See drivers/leds/leds-as3645a.c and look for the
v4l2_flash_indicator_init() for reference.

> +	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)
> +		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 int mt6360_init_isnk_properties(struct mt6360_led *led, struct led_init_data *init_data)
> +{
> +	struct led_classdev *isnk = &led->isnk;
> +
> +	if (led->led_no == MT6360_LED_ISNK4)
> +		isnk->max_brightness = MT6360_ISNK4_MAXLEVEL;
> +	else
> +		isnk->max_brightness = MT6360_ISNK1_MAXLEVEL;
> +
> +	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;

In case of missing property I would print warning and inform the user
that we're defaulting to min value. Same applies to similar occurrences
below.

> +	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);
> +	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]) {
> +			ret = -EINVAL;
> +			goto out;
> +		}
> +
> +		led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
> +		if (!led) {
> +			ret = -ENOMEM;
> +			goto out;
> +		}
> +
> +		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;
> +
> +		priv->leds[reg] = led;
> +	}
> +
> +	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 && 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 && led->v4l2_flash)
> +			v4l2_flash_release(led->v4l2_flash);
> +
> +	}

You're using this for loop twice, so it would be nice to wrap
it with a function to avoid code redundancy.

> +
> +	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("Gene Chen <gene_chen@richtek.com>");
> +MODULE_DESCRIPTION("MT6360 Led Driver");
> +MODULE_LICENSE("GPL v2");
> 

-- 
Best regards,
Jacek Anaszewski