On Thu, Nov 28, 2024 at 04:23:37PM +0100, Hans de Goede wrote:
> The ov2740 sensor has both reset and power_down inputs according to
> the datasheet one or the other should always be tied to DOVDD but on
> some designs both are attached to GPIOs.
>
> Add support for controlling both a reset and a powerdown GPIO.
>
> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Tested-by: Stanislaw Gruszka <stanislaw.gruszka@xxxxxxxxxxxxxxx>
> ---
> drivers/media/i2c/ov2740.c | 15 +++++++++++++--
> 1 file changed, 13 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/media/i2c/ov2740.c b/drivers/media/i2c/ov2740.c
> index 998e1977978d..14d0a0588cc2 100644
> --- a/drivers/media/i2c/ov2740.c
> +++ b/drivers/media/i2c/ov2740.c
> @@ -525,6 +525,7 @@ struct ov2740 {
>
> /* GPIOs, clocks */
> struct gpio_desc *reset_gpio;
> + struct gpio_desc *powerdown_gpio;
> struct clk *clk;
>
> /* Current mode */
> @@ -1306,6 +1307,7 @@ static int ov2740_suspend(struct device *dev)
> struct ov2740 *ov2740 = to_ov2740(sd);
>
> gpiod_set_value_cansleep(ov2740->reset_gpio, 1);
> + gpiod_set_value_cansleep(ov2740->powerdown_gpio, 1);
> clk_disable_unprepare(ov2740->clk);
> return 0;
> }
> @@ -1320,6 +1322,7 @@ static int ov2740_resume(struct device *dev)
> if (ret)
> return ret;
>
> + gpiod_set_value_cansleep(ov2740->powerdown_gpio, 0);
> gpiod_set_value_cansleep(ov2740->reset_gpio, 0);
> msleep(20);
>
> @@ -1348,9 +1351,17 @@ static int ov2740_probe(struct i2c_client *client)
> if (IS_ERR(ov2740->reset_gpio)) {
> return dev_err_probe(dev, PTR_ERR(ov2740->reset_gpio),
> "failed to get reset GPIO\n");
> - } else if (ov2740->reset_gpio) {
> + }
> +
> + ov2740->powerdown_gpio = devm_gpiod_get_optional(dev, "powerdown", GPIOD_OUT_HIGH);
> + if (IS_ERR(ov2740->powerdown_gpio)) {
> + return dev_err_probe(dev, PTR_ERR(ov2740->powerdown_gpio),
> + "failed to get powerdown GPIO\n");
> + }
> +
> + if (ov2740->reset_gpio || ov2740->powerdown_gpio) {
> /*
> - * Ensure reset is asserted for at least 20 ms before
> + * Ensure reset/powerdown is asserted for at least 20 ms before
> * ov2740_resume() deasserts it.
> */
> msleep(20);
> --
> 2.47.0
>
>
