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SubjectRe: [PATCH v3 1/2] leds: mt6360: Add LED driver for MT6360
From
Date
Gene

On 9/7/20 5:27 AM, 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];

I would prefer to use a flexible array here as you are not guaranteed
that the DT will contain 6 LED entries and it will simplify your probe
and DT parsing.

There are examples of using the flexible array

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/leds/leds-cr0014114.c

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/leds/leds-lm3697.c

> + 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)
> + 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;
> + 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);

Using the flexible array in the mt6360_priv will eliminate this allocation.

Dan

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