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

[git at luigi311.com]

From: Luis Garcia <git at luigi311.com>

It was documented in DT, but not implemented.

Signed-off-by: Ondrej Jirman <megous at megous.com>
Signed-off-by: Luis Garcia <git at 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