[PATCH v4 22/25] media: i2c: imx258: Add support for powerdown gpio

[git at luigi311.com]

From: Luis Garcia <git at luigi311.com>

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

Signed-off-by: Ondrej Jirman <megi at xff.cz>
Signed-off-by: Luis Garcia <git at luigi311.com>
---
 drivers/media/i2c/imx258.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/media/i2c/imx258.c b/drivers/media/i2c/imx258.c
index f043200e336e..f0bd72f241e4 100644
--- a/drivers/media/i2c/imx258.c
+++ b/drivers/media/i2c/imx258.c
@@ -698,6 +698,8 @@ 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.
@@ -1231,6 +1233,8 @@ 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) {
@@ -1242,6 +1246,7 @@ 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);
 	}
 
@@ -1254,6 +1259,9 @@ static int imx258_power_off(struct device *dev)
 	struct imx258 *imx258 = to_imx258(sd);
 
 	clk_disable_unprepare(imx258->clk);
+
+	gpiod_set_value_cansleep(imx258->powerdown_gpio, 1);
+
 	regulator_bulk_disable(IMX258_NUM_SUPPLIES, imx258->supplies);
 
 	return 0;
@@ -1559,6 +1567,12 @@ 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);
 
-- 
2.44.0