Commit 1cb7b399 authored by Vladimir Zapolskiy's avatar Vladimir Zapolskiy Committed by Hans Verkuil
Browse files

media: i2c: og01a1b: Add management of optional reset GPIO 



Omnivision OG01A1B camera sensor may have a connected active low GPIO
to XSHUTDOWN pad, and if so, include it into sensor power up sequence.

Signed-off-by: default avatarVladimir Zapolskiy <vladimir.zapolskiy@linaro.org>
Signed-off-by: default avatarSakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: default avatarHans Verkuil <hverkuil-cisco@xs4all.nl>
parent a95ffde2

drivers/media/i2c/og01a1b.c

+16 −1
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ 
#include <linux/acpi.h>

#include <linux/clk.h>

#include <linux/delay.h>

#include <linux/gpio/consumer.h>

#include <linux/i2c.h>

#include <linux/module.h>

#include <linux/pm_runtime.h>
@@ -420,6 +421,7 @@ static const struct og01a1b_mode supported_modes[] = { 


struct og01a1b {

	struct clk *xvclk;

	struct gpio_desc *reset_gpio;



	struct v4l2_subdev sd;

	struct media_pad pad;
@@ -987,7 +989,11 @@ static int og01a1b_power_on(struct device *dev) 
	if (ret)

		return ret;



	if (og01a1b->xvclk)

	gpiod_set_value_cansleep(og01a1b->reset_gpio, 0);



	if (og01a1b->reset_gpio)

		usleep_range(5 * USEC_PER_MSEC, 6 * USEC_PER_MSEC);

	else if (og01a1b->xvclk)

		usleep_range(delay, 2 * delay);



	return 0;
@@ -1004,6 +1010,8 @@ static int og01a1b_power_off(struct device *dev) 


	clk_disable_unprepare(og01a1b->xvclk);



	gpiod_set_value_cansleep(og01a1b->reset_gpio, 1);



	return 0;

}
@@ -1044,6 +1052,13 @@ static int og01a1b_probe(struct i2c_client *client) 
		return ret;

	}



	og01a1b->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",

						      GPIOD_OUT_LOW);

	if (IS_ERR(og01a1b->reset_gpio)) {

		dev_err(&client->dev, "cannot get reset GPIO\n");

		return PTR_ERR(og01a1b->reset_gpio);

	}



	/* The sensor must be powered on to read the CHIP_ID register */

	ret = og01a1b_power_on(&client->dev);

	if (ret)