[PATCH v3 23/25] drivers: media: i2c: imx258: Add support for powerdown gpio

[git]

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

On some boards powerdown signal needs to be deasserted for this
sensor to be enabled.

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

diff --git a/drivers/media/i2c/imx258.c b/drivers/media/i2c/imx258.c
index 30352c33f63c..163f04f6f954 100644
--- a/drivers/media/i2c/imx258.c
+++ b/drivers/media/i2c/imx258.c
@@ -679,6 +679,8 @@ struct imx258 {
        unsigned int lane_mode_idx;
        unsigned int csi2_flags;
 
+       struct gpio_desc *powerdown_gpio;
+
        /*
         * Mutex for serialized access:
         * Protect sensor module set pad format and start/stop streaming safely.
@@ -1213,6 +1215,8 @@ static int imx258_power_on(struct device *dev)
        struct imx258 *imx258 = to_imx258(sd);
        int ret;
 
+       gpiod_set_value_cansleep(imx258->powerdown_gpio, 0);
+
        ret = regulator_bulk_enable(IMX258_NUM_SUPPLIES,
                                    imx258->supplies);
        if (ret) {
@@ -1224,6 +1228,7 @@ static int imx258_power_on(struct device *dev)
        ret = clk_prepare_enable(imx258->clk);
        if (ret) {
                dev_err(dev, "failed to enable clock\n");
+               gpiod_set_value_cansleep(imx258->powerdown_gpio, 1);
                regulator_bulk_disable(IMX258_NUM_SUPPLIES, imx258->supplies);
        }
 
@@ -1238,6 +1243,8 @@ static int imx258_power_off(struct device *dev)
        clk_disable_unprepare(imx258->clk);
        regulator_bulk_disable(IMX258_NUM_SUPPLIES, imx258->supplies);
 
+       gpiod_set_value_cansleep(imx258->powerdown_gpio, 1);
+
        return 0;
 }
 
@@ -1541,6 +1548,12 @@ static int imx258_probe(struct i2c_client *client)
        if (!imx258->variant_cfg)
                imx258->variant_cfg = &imx258_cfg;
 
+       /* request optional power down pin */
+       imx258->powerdown_gpio = devm_gpiod_get_optional(&client->dev, 
"powerdown",
+                                                   GPIOD_OUT_HIGH);
+       if (IS_ERR(imx258->powerdown_gpio))
+               return PTR_ERR(imx258->powerdown_gpio);
+
        /* Initialize subdev */
        v4l2_i2c_subdev_init(&imx258->sd, client, &imx258_subdev_ops);
 
-- 
2.42.0