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Date: Tue, 14 Mar 2023 13:00:41 +0200
From: Sakari Ailus <sakari.ailus@....fi>
To: Svyatoslav Ryhel <clamor95@...il.com>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Hans Verkuil <hverkuil-cisco@...all.nl>,
Luca Ceresoli <luca.ceresoli@...tlin.com>,
Jean Delvare <jdelvare@...e.de>,
Sebastian Reichel <sebastian.reichel@...labora.com>,
Daniel Jeong <gshark.jeong@...il.com>,
Ldd-Mlp <ldd-mlp@...t.ti.com>, linux-media@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/2] media: lm3560: convent to OF
Hi Svyatoslav,
Thanks for the patch.
On Wed, Mar 08, 2023 at 11:52:09AM +0200, Svyatoslav Ryhel wrote:
> If no pdata is available, try to read from device tree.
I think platform data support could be even dropped these days. But it
should probably be a separate patch. I think either before or after this
one would be fine.
>
> Signed-off-by: Svyatoslav Ryhel <clamor95@...il.com>
> ---
> drivers/media/i2c/lm3560.c | 128 +++++++++++++++++++++++++++----------
> 1 file changed, 93 insertions(+), 35 deletions(-)
>
> diff --git a/drivers/media/i2c/lm3560.c b/drivers/media/i2c/lm3560.c
> index 5ef613604be7..5541051616b7 100644
> --- a/drivers/media/i2c/lm3560.c
> +++ b/drivers/media/i2c/lm3560.c
> @@ -11,6 +11,7 @@
>
> #include <linux/delay.h>
> #include <linux/module.h>
> +#include <linux/gpio.h>
> #include <linux/i2c.h>
> #include <linux/slab.h>
> #include <linux/mutex.h>
> @@ -22,16 +23,16 @@
>
> /* registers definitions */
> #define REG_ENABLE 0x10
> -#define REG_TORCH_BR 0xa0
> -#define REG_FLASH_BR 0xb0
> -#define REG_FLASH_TOUT 0xc0
> +#define REG_TORCH_BR 0xa0
> +#define REG_FLASH_BR 0xb0
> +#define REG_FLASH_TOUT 0xc0
> #define REG_FLAG 0xd0
> #define REG_CONFIG1 0xe0
>
> /* fault mask */
> -#define FAULT_TIMEOUT (1<<0)
> -#define FAULT_OVERTEMP (1<<1)
> -#define FAULT_SHORT_CIRCUIT (1<<2)
> +#define FAULT_TIMEOUT BIT(0)
> +#define FAULT_OVERTEMP BIT(1)
> +#define FAULT_SHORT_CIRCUIT BIT(2)
>
> enum led_enable {
> MODE_SHDN = 0x0,
> @@ -54,6 +55,7 @@ struct lm3560_flash {
> struct device *dev;
> struct lm3560_platform_data *pdata;
> struct regmap *regmap;
> + struct gpio_desc *hwen_gpio;
> struct mutex lock;
>
> enum v4l2_flash_led_mode led_mode;
> @@ -356,12 +358,19 @@ static int lm3560_subdev_init(struct lm3560_flash *flash,
> flash->subdev_led[led_no].flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> strscpy(flash->subdev_led[led_no].name, led_name,
> sizeof(flash->subdev_led[led_no].name));
> +
> rval = lm3560_init_controls(flash, led_no);
> - if (rval)
> + if (rval) {
> + dev_err(flash->dev, "failed to init controls: %d\n", rval);
> goto err_out;
> + }
> +
> rval = media_entity_pads_init(&flash->subdev_led[led_no].entity, 0, NULL);
> - if (rval < 0)
> + if (rval < 0) {
> + dev_err(flash->dev, "failed to init media entity pads: %d\n", rval);
> goto err_out;
> + }
> +
> flash->subdev_led[led_no].entity.function = MEDIA_ENT_F_FLASH;
>
> return rval;
> @@ -391,6 +400,49 @@ static int lm3560_init_device(struct lm3560_flash *flash)
> return rval;
> }
>
> +static int lm3560_of_probe(struct lm3560_flash *flash)
> +{
> + struct lm3560_platform_data *pdata;
> + struct fwnode_handle *node;
> + int ret, reg;
> +
> + pdata = devm_kzalloc(flash->dev, sizeof(*pdata), GFP_KERNEL);
> + if (!pdata)
> + return -ENODEV;
> +
> + ret = device_property_read_u32(flash->dev,
> + "ti,peak-current", &pdata->peak);
> + if (ret)
> + pdata->peak = LM3560_PEAK_3600mA;
> +
> + ret = device_property_read_u32(flash->dev,
> + "ti,max-flash-timeout",
> + &pdata->max_flash_timeout);
> + if (ret)
> + pdata->max_flash_timeout = LM3560_FLASH_TOUT_MAX;
> +
> + device_for_each_child_node(flash->dev, node) {
> + fwnode_property_read_u32(node, "reg", ®);
> +
> + if (reg == LM3560_LED0 || reg == LM3560_LED1) {
> + ret = device_property_read_u32(flash->dev,
> + "ti,max-flash-current",
> + &pdata->max_flash_brt[reg]);
> + if (ret)
> + pdata->max_flash_brt[reg] = LM3560_FLASH_TOUT_MAX;
> +
> + ret = device_property_read_u32(flash->dev,
> + "ti,max-torch-current",
> + &pdata->max_torch_brt[reg]);
> + if (ret)
> + pdata->max_torch_brt[reg] = LM3560_TORCH_BRT_MAX;
> + }
> + }
> + flash->pdata = pdata;
> +
> + return 0;
> +}
> +
> static int lm3560_probe(struct i2c_client *client)
> {
> struct lm3560_flash *flash;
> @@ -398,44 +450,41 @@ static int lm3560_probe(struct i2c_client *client)
> int rval;
>
> flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
> - if (flash == NULL)
> + if (!flash)
> return -ENOMEM;
>
> flash->regmap = devm_regmap_init_i2c(client, &lm3560_regmap);
> - if (IS_ERR(flash->regmap)) {
> - rval = PTR_ERR(flash->regmap);
> - return rval;
> - }
> + if (IS_ERR(flash->regmap))
> + return dev_err_probe(&client->dev, PTR_ERR(flash->regmap),
> + "failed to init regmap\n");
>
> - /* if there is no platform data, use chip default value */
> - if (pdata == NULL) {
> - pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
> - if (pdata == NULL)
> - return -ENODEV;
> - pdata->peak = LM3560_PEAK_3600mA;
> - pdata->max_flash_timeout = LM3560_FLASH_TOUT_MAX;
> - /* led 1 */
> - pdata->max_flash_brt[LM3560_LED0] = LM3560_FLASH_BRT_MAX;
> - pdata->max_torch_brt[LM3560_LED0] = LM3560_TORCH_BRT_MAX;
> - /* led 2 */
> - pdata->max_flash_brt[LM3560_LED1] = LM3560_FLASH_BRT_MAX;
> - pdata->max_torch_brt[LM3560_LED1] = LM3560_TORCH_BRT_MAX;
> - }
> - flash->pdata = pdata;
> flash->dev = &client->dev;
> mutex_init(&flash->lock);
>
> + /* if there is no platform data, try to read from device tree */
> + if (!pdata)
> + lm3560_of_probe(flash);
> +
> + flash->hwen_gpio = devm_gpiod_get_optional(flash->dev, "enable",
> + GPIOD_OUT_HIGH);
> + if (IS_ERR(flash->hwen_gpio))
> + return dev_err_probe(&client->dev, PTR_ERR(flash->hwen_gpio),
> + "failed to get hwen gpio\n");
> +
> rval = lm3560_subdev_init(flash, LM3560_LED0, "lm3560-led0");
> if (rval < 0)
> - return rval;
> + return dev_err_probe(&client->dev, rval,
> + "failed to init led0 subdev\n");
>
> rval = lm3560_subdev_init(flash, LM3560_LED1, "lm3560-led1");
> if (rval < 0)
> - return rval;
> + return dev_err_probe(&client->dev, rval,
> + "failed to init led1 subdev\n");
>
> rval = lm3560_init_device(flash);
> if (rval < 0)
> - return rval;
> + return dev_err_probe(&client->dev, rval,
> + "failed to init device\n");
>
> i2c_set_clientdata(client, flash);
>
> @@ -452,21 +501,30 @@ static void lm3560_remove(struct i2c_client *client)
> v4l2_ctrl_handler_free(&flash->ctrls_led[i]);
> media_entity_cleanup(&flash->subdev_led[i].entity);
> }
> +
> + gpiod_set_value_cansleep(flash->hwen_gpio, 0);
> }
>
> +static const struct of_device_id lm3560_match[] = {
> + { .compatible = "ti,lm3559" },
> + { .compatible = "ti,lm3560" },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, lm3560_match);
> +
> static const struct i2c_device_id lm3560_id_table[] = {
> {LM3559_NAME, 0},
> {LM3560_NAME, 0},
> {}
> };
> -
> MODULE_DEVICE_TABLE(i2c, lm3560_id_table);
>
> static struct i2c_driver lm3560_i2c_driver = {
> .driver = {
> - .name = LM3560_NAME,
> - .pm = NULL,
> - },
> + .name = LM3560_NAME,
> + .pm = NULL,
> + .of_match_table = lm3560_match,
> + },
> .probe_new = lm3560_probe,
> .remove = lm3560_remove,
> .id_table = lm3560_id_table,
--
Kind regards,
Sakari Ailus
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