On Thu, Nov 28, 2024 at 04:23:38PM +0100, Hans de Goede wrote:
> On some designs the regulators for the AVDD / DOVDD / DVDD power rails
> are controlled by Linux.
>
> Add support to the driver for getting regulators for these 3 rails and
> for enabling these regulators when necessary.
>
> The datasheet specifies a delay of 0ns between enabling the regulators,
> IOW they can all 3 be enabled at the same time. This allows using the bulk
> regulator API.
>
> The regulator core will provide dummy regulators for the 3 power-rails
> when necessary.
>
> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Tested-by: Stanislaw Gruszka <stanislaw.gruszka@xxxxxxxxxxxxxxx>
> drivers/media/i2c/ov2740.c | 30 +++++++++++++++++++++++++++---
> 1 file changed, 27 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/media/i2c/ov2740.c b/drivers/media/i2c/ov2740.c
> index 14d0a0588cc2..c766c1f83e12 100644
> --- a/drivers/media/i2c/ov2740.c
> +++ b/drivers/media/i2c/ov2740.c
> @@ -11,6 +11,7 @@
> #include <linux/pm_runtime.h>
> #include <linux/nvmem-provider.h>
> #include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
> #include <media/v4l2-ctrls.h>
> #include <media/v4l2-device.h>
> #include <media/v4l2-fwnode.h>
> @@ -76,6 +77,14 @@
> /* OTP registers from sensor */
> #define OV2740_REG_OTP_CUSTOMER 0x7010
>
> +static const char * const ov2740_supply_name[] = {
> + "AVDD",
> + "DOVDD",
> + "DVDD",
> +};
> +
> +#define OV2740_NUM_SUPPLIES ARRAY_SIZE(ov2740_supply_name)
> +
> struct nvm_data {
> struct nvmem_device *nvmem;
> struct regmap *regmap;
> @@ -523,10 +532,11 @@ struct ov2740 {
> struct v4l2_ctrl *hblank;
> struct v4l2_ctrl *exposure;
>
> - /* GPIOs, clocks */
> + /* GPIOs, clocks, regulators */
> struct gpio_desc *reset_gpio;
> struct gpio_desc *powerdown_gpio;
> struct clk *clk;
> + struct regulator_bulk_data supplies[OV2740_NUM_SUPPLIES];
>
> /* Current mode */
> const struct ov2740_mode *cur_mode;
> @@ -1309,6 +1319,7 @@ static int ov2740_suspend(struct device *dev)
> gpiod_set_value_cansleep(ov2740->reset_gpio, 1);
> gpiod_set_value_cansleep(ov2740->powerdown_gpio, 1);
> clk_disable_unprepare(ov2740->clk);
> + regulator_bulk_disable(OV2740_NUM_SUPPLIES, ov2740->supplies);
> return 0;
> }
>
> @@ -1318,10 +1329,16 @@ static int ov2740_resume(struct device *dev)
> struct ov2740 *ov2740 = to_ov2740(sd);
> int ret;
>
> - ret = clk_prepare_enable(ov2740->clk);
> + ret = regulator_bulk_enable(OV2740_NUM_SUPPLIES, ov2740->supplies);
> if (ret)
> return ret;
>
> + ret = clk_prepare_enable(ov2740->clk);
> + if (ret) {
> + regulator_bulk_disable(OV2740_NUM_SUPPLIES, ov2740->supplies);
> + return ret;
> + }
> +
> gpiod_set_value_cansleep(ov2740->powerdown_gpio, 0);
> gpiod_set_value_cansleep(ov2740->reset_gpio, 0);
> msleep(20);
> @@ -1334,7 +1351,7 @@ static int ov2740_probe(struct i2c_client *client)
> struct device *dev = &client->dev;
> struct ov2740 *ov2740;
> bool full_power;
> - int ret;
> + int i, ret;
>
> ov2740 = devm_kzalloc(&client->dev, sizeof(*ov2740), GFP_KERNEL);
> if (!ov2740)
> @@ -1372,6 +1389,13 @@ static int ov2740_probe(struct i2c_client *client)
> return dev_err_probe(dev, PTR_ERR(ov2740->clk),
> "failed to get clock\n");
>
> + for (i = 0; i < OV2740_NUM_SUPPLIES; i++)
> + ov2740->supplies[i].supply = ov2740_supply_name[i];
> +
> + ret = devm_regulator_bulk_get(dev, OV2740_NUM_SUPPLIES, ov2740->supplies);
> + if (ret)
> + return dev_err_probe(dev, ret, "failed to get regulators\n");
> +
> full_power = acpi_dev_state_d0(&client->dev);
> if (full_power) {
> /* ACPI does not always clear the reset GPIO / enable the clock */
> --
> 2.47.0
>
>
