Re: [PATCH v5 5/6] media: i2c: lm3560: Add support for PM features

Sakari Ailus
2026-05-04T06:37:13Z

Hi Svyatoslav,

On Sun, May 03, 2026 at 07:44:44PM +0300, Svyatoslav Ryhel wrote:
> Add support for power management features to better control the LM3560
> within the media framework. To achieve the desired PM support, the HWEN
> GPIO and VIN power supply were added and configured into power on/off
> sequences. Added PM operations along with the PM configuration setup.
>
> Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
> ---
> drivers/media/i2c/lm3560.c | 117 ++++++++++++++++++++++++++++++++++---
> 1 file changed, 110 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/media/i2c/lm3560.c b/drivers/media/i2c/lm3560.c
> index ce4b09d1f208..15741ea5684f 100644
> --- a/drivers/media/i2c/lm3560.c
> +++ b/drivers/media/i2c/lm3560.c
> @@ -12,13 +12,16 @@
> #include <linux/bitmap.h>
> #include <linux/delay.h>
> #include <linux/module.h>
> +#include <linux/gpio/consumer.h>
> #include <linux/i2c.h>
> #include <linux/slab.h>
> #include <linux/mod_devicetable.h>
> #include <linux/mutex.h>
> #include <linux/of.h>
> +#include <linux/pm_runtime.h>
> #include <linux/property.h>
> #include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
> #include <linux/videodev2.h>
> #include <media/i2c/lm3560.h>
> #include <media/v4l2-ctrls.h>
> @@ -49,6 +52,8 @@ enum led_enable {
> * @dev: pointer to &struct device
> * @regmap: reg. map for i2c
> * @lock: muxtex for serial access.
> + * @hwen_gpio: line connected to HWEN pin
> + * @vin_supply: line connected to IN supply (2.5V - 5.5V)
> * @led_mode: V4L2 LED mode
> * @ctrls_led: V4L2 controls
> * @subdev_led: V4L2 subdev
> @@ -63,6 +68,9 @@ struct lm3560_flash {
> struct regmap *regmap;
> struct mutex lock;
>
> + struct gpio_desc *hwen_gpio;
> + struct regulator *vin_supply;
> +
> enum v4l2_flash_led_mode led_mode;
> struct v4l2_ctrl_handler ctrls_led[LM3560_LED_MAX];
> struct v4l2_subdev subdev_led[LM3560_LED_MAX];
> @@ -177,12 +185,17 @@ static int lm3560_get_ctrl(struct v4l2_ctrl *ctrl, enum lm3560_led_id led_no)
> struct lm3560_flash *flash = to_lm3560_flash(ctrl, led_no);
> int rval = -EINVAL;
>
> + if (!pm_runtime_get_if_in_use(flash->dev))
> + return 0;
> +
> if (ctrl->id == V4L2_CID_FLASH_FAULT) {
> s32 fault = 0;
> unsigned int reg_val;
> rval = regmap_read(flash->regmap, REG_FLAG, &reg_val);
> - if (rval < 0)
> + if (rval < 0) {
> + pm_runtime_put(flash->dev);
> return rval;
> + }
> if (reg_val & FAULT_SHORT_CIRCUIT)
> fault |= V4L2_FLASH_FAULT_SHORT_CIRCUIT;
> if (reg_val & FAULT_OVERTEMP)
> @@ -192,6 +205,8 @@ static int lm3560_get_ctrl(struct v4l2_ctrl *ctrl, enum lm3560_led_id led_no)
> ctrl->cur.val = fault;
> }
>
> + pm_runtime_put(flash->dev);
> +
> return rval;
> }
>
> @@ -201,6 +216,9 @@ static int lm3560_set_ctrl(struct v4l2_ctrl *ctrl, enum lm3560_led_id led_no)
> u8 tout_bits;
> int rval = -EINVAL;
>
> + if (!pm_runtime_get_if_in_use(flash->dev))

This should be pm_runtime_get_if_active().

> + return 0;
> +
> switch (ctrl->id) {
> case V4L2_CID_FLASH_LED_MODE:
> flash->led_mode = ctrl->val;
> @@ -246,6 +264,8 @@ static int lm3560_set_ctrl(struct v4l2_ctrl *ctrl, enum lm3560_led_id led_no)
> break;
> }
>
> + pm_runtime_put(flash->dev);
> +
> return rval;
> }
>
> @@ -409,6 +429,38 @@ static int lm3560_init_device(struct lm3560_flash *flash)
> return rval;
> }
>
> +static int __maybe_unused lm3560_power_off(struct device *dev)
> +{
> + struct lm3560_flash *flash = dev_get_drvdata(dev);
> +
> + gpiod_set_value_cansleep(flash->hwen_gpio, 0);
> + regulator_disable(flash->vin_supply);
> +
> + return 0;
> +}
> +
> +static int __maybe_unused lm3560_power_on(struct device *dev)
> +{
> + struct lm3560_flash *flash = dev_get_drvdata(dev);
> + int rval;
> +
> + rval = regulator_enable(flash->vin_supply);
> + if (rval < 0) {
> + dev_err(flash->dev, "failed to enable vin power supply\n");
> + return rval;
> + }
> +
> + gpiod_set_value_cansleep(flash->hwen_gpio, 1);
> +
> + rval = lm3560_init_device(flash);
> + if (rval < 0) {
> + lm3560_power_off(dev);
> + return rval;
> + }
> +
> + return 0;
> +}
> +
> static void lm3560_subdev_cleanup(struct lm3560_flash *flash)
> {
> int led_no;
> @@ -442,6 +494,17 @@ static int lm3560_probe(struct i2c_client *client)
>
> bitmap_zero(flash->led_id, LM3560_LED_MAX);
>
> + flash->hwen_gpio = devm_gpiod_get_optional(flash->dev, "enable",
> + GPIOD_OUT_LOW);
> + if (IS_ERR(flash->hwen_gpio))
> + return dev_err_probe(flash->dev, PTR_ERR(flash->hwen_gpio),
> + "failed to get hwen gpio\n");
> +
> + flash->vin_supply = devm_regulator_get(flash->dev, "vin");
> + if (IS_ERR(flash->vin_supply))
> + return dev_err_probe(flash->dev, PTR_ERR(flash->vin_supply),
> + "failed to get vin-supply\n");
> +
> flash->peak = LM3560_PEAK_1600mA;
> rval = device_property_read_u32(flash->dev,
> "ti,peak-current-microamp", &peak_ua);
> @@ -469,9 +532,19 @@ static int lm3560_probe(struct i2c_client *client)
> &flash->max_flash_timeout);
> flash->max_flash_timeout /= 1000;
>
> + rval = regulator_enable(flash->vin_supply);
> + if (rval < 0)
> + return dev_err_probe(flash->dev, rval,
> + "failed to enable vin power supply\n");
> +
> + gpiod_set_value_cansleep(flash->hwen_gpio, 1);
> +
> rval = lm3560_init_device(flash);
> if (rval < 0)
> - return rval;
> + goto error_disable;
> +
> + pm_runtime_set_active(flash->dev);
> + pm_runtime_enable(flash->dev);
>
> for_each_available_child_of_node(dev_of_node(flash->dev), node) {
> u32 reg;
> @@ -492,10 +565,10 @@ static int lm3560_probe(struct i2c_client *client)
>
> rval = lm3560_subdev_init(flash, reg, node);
> if (rval < 0) {
> - lm3560_subdev_cleanup(flash);
> - return dev_err_probe(flash->dev, rval,
> - "failed to register led%d\n",
> - reg);
> + dev_err(flash->dev,
> + "failed to register led%d: %d\n",
> + reg, rval);
> + goto error_clean;
> }
>
> set_bit(reg, flash->led_id);
> @@ -504,7 +577,23 @@ static int lm3560_probe(struct i2c_client *client)
>
> i2c_set_clientdata(client, flash);
>
> + pm_runtime_set_autosuspend_delay(flash->dev, 1000);
> + pm_runtime_use_autosuspend(flash->dev);
> + pm_runtime_idle(flash->dev);
> +
> return 0;
> +
> +error_clean:
> + pm_runtime_disable(flash->dev);
> + pm_runtime_set_suspended(flash->dev);
> +
> + lm3560_subdev_cleanup(flash);
> +
> +error_disable:
> + gpiod_set_value_cansleep(flash->hwen_gpio, 0);
> + regulator_disable(flash->vin_supply);
> +
> + return rval;
> }
>
> static void lm3560_remove(struct i2c_client *client)
> @@ -512,8 +601,22 @@ static void lm3560_remove(struct i2c_client *client)
> struct lm3560_flash *flash = i2c_get_clientdata(client);
>
> lm3560_subdev_cleanup(flash);
> +
> + /*
> + * Disable runtime PM. In case runtime PM is disabled in the kernel,
> + * make sure to turn power off manually.
> + */
> + pm_runtime_disable(&client->dev);
> + if (!pm_runtime_status_suspended(&client->dev)) {
> + lm3560_power_off(&client->dev);
> + pm_runtime_set_suspended(&client->dev);
> + }
> }
>
> +static const struct dev_pm_ops lm3560_pm_ops = {
> + SET_RUNTIME_PM_OPS(lm3560_power_off, lm3560_power_on, NULL)
> +};
> +
> static const struct of_device_id lm3560_of_match[] = {
> { .compatible = "ti,lm3559" },
> { .compatible = "ti,lm3560" },
> @@ -532,7 +635,7 @@ MODULE_DEVICE_TABLE(i2c, lm3560_id_table);
> static struct i2c_driver lm3560_i2c_driver = {
> .driver = {
> .name = LM3560_NAME,
> - .pm = NULL,
> + .pm = pm_ptr(&lm3560_pm_ops),
> .of_match_table = lm3560_of_match,
> },
> .probe = lm3560_probe,

--
Kind regards,

Sakari Ailus