media: imx335: Fix reset-gpio handling

Rectify the logical value of reset-gpio so that it is set to
0 (disabled) during power-on and to 1 (enabled) during power-off.

Set the reset-gpio to GPIO_OUT_HIGH at initialization time to make
sure it starts off in reset. Also drop the "Set XCLR" comment which
is not-so-informative.

The existing usage of imx335 had reset-gpios polarity inverted
(GPIO_ACTIVE_HIGH) in their device-tree sources. With this patch
included, those DTS will not be able to stream imx335 anymore. The
reset-gpio polarity will need to be rectified in the device-tree
sources as shown in [1] example, in order to get imx335 functional
again (as it remains in reset prior to this fix).

Cc: [email protected]
Fixes: 45d19b5 ("media: i2c: Add imx335 camera sensor driver")
Reviewed-by: Laurent Pinchart <[email protected]>
Link: https://lore.kernel.org/linux-media/[email protected]/
Signed-off-by: Umang Jain <[email protected]>
Signed-off-by: Sakari Ailus <[email protected]>
Signed-off-by: Hans Verkuil <[email protected]>

Author: Umang Jain

drivers/media/i2c/imx335.c

@@ -997,7 +997,7 @@ static int imx335_parse_hw_config(struct imx335 *imx335)
 
 	/* Request optional reset pin */
 	imx335->reset_gpio = devm_gpiod_get_optional(imx335->dev, "reset",
-						     GPIOD_OUT_LOW);
+						     GPIOD_OUT_HIGH);
 	if (IS_ERR(imx335->reset_gpio)) {
 		dev_err(imx335->dev, "failed to get reset gpio %ld\n",
 			PTR_ERR(imx335->reset_gpio));
@@ -1110,8 +1110,7 @@ static int imx335_power_on(struct device *dev)
 
 	usleep_range(500, 550); /* Tlow */
 
-	/* Set XCLR */
-	gpiod_set_value_cansleep(imx335->reset_gpio, 1);
+	gpiod_set_value_cansleep(imx335->reset_gpio, 0);
 
 	ret = clk_prepare_enable(imx335->inclk);
 	if (ret) {
@@ -1124,7 +1123,7 @@ static int imx335_power_on(struct device *dev)
 	return 0;
 
 error_reset:
-	gpiod_set_value_cansleep(imx335->reset_gpio, 0);
+	gpiod_set_value_cansleep(imx335->reset_gpio, 1);
 	regulator_bulk_disable(ARRAY_SIZE(imx335_supply_name), imx335->supplies);
 
 	return ret;
@@ -1141,7 +1140,7 @@ static int imx335_power_off(struct device *dev)
 	struct v4l2_subdev *sd = dev_get_drvdata(dev);
 	struct imx335 *imx335 = to_imx335(sd);
 
-	gpiod_set_value_cansleep(imx335->reset_gpio, 0);
+	gpiod_set_value_cansleep(imx335->reset_gpio, 1);
 	clk_disable_unprepare(imx335->inclk);
 	regulator_bulk_disable(ARRAY_SIZE(imx335_supply_name), imx335->supplies);