[PATCH v4 23/25] media: i2c: imx258: Add support for reset gpio

[git]

From: Luis Garcia <g...@luigi311.com>

It was documented in DT, but not implemented.

Signed-off-by: Ondrej Jirman <meg...@megous.com>
Signed-off-by: Luis Garcia <g...@luigi311.com>
---
 drivers/media/i2c/imx258.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/media/i2c/imx258.c b/drivers/media/i2c/imx258.c
index f0bd72f241e4..5de71cb7c1ae 100644
--- a/drivers/media/i2c/imx258.c
+++ b/drivers/media/i2c/imx258.c
@@ -699,6 +699,7 @@ struct imx258 {
        unsigned int csi2_flags;
 
        struct gpio_desc *powerdown_gpio;
+       struct gpio_desc *reset_gpio;
 
        /*
         * Mutex for serialized access:
@@ -1250,7 +1251,11 @@ static int imx258_power_on(struct device *dev)
                regulator_bulk_disable(IMX258_NUM_SUPPLIES, imx258->supplies);
        }
 
-       return ret;
+       gpiod_set_value_cansleep(imx258->reset_gpio, 0);
+
+       usleep_range(400, 500);
+
+       return 0;
 }
 
 static int imx258_power_off(struct device *dev)
@@ -1260,6 +1265,7 @@ static int imx258_power_off(struct device *dev)
 
        clk_disable_unprepare(imx258->clk);
 
+       gpiod_set_value_cansleep(imx258->reset_gpio, 1);
        gpiod_set_value_cansleep(imx258->powerdown_gpio, 1);
 
        regulator_bulk_disable(IMX258_NUM_SUPPLIES, imx258->supplies);
@@ -1573,6 +1579,12 @@ static int imx258_probe(struct i2c_client *client)
        if (IS_ERR(imx258->powerdown_gpio))
                return PTR_ERR(imx258->powerdown_gpio);
 
+       /* request optional reset pin */
+       imx258->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
+                                                    GPIOD_OUT_HIGH);
+       if (IS_ERR(imx258->reset_gpio))
+               return PTR_ERR(imx258->reset_gpio);
+
        /* Initialize subdev */
        v4l2_i2c_subdev_init(&imx258->sd, client, &imx258_subdev_ops);
 
-- 
2.44.0