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Subject: media: i2c: og01a1b: Add management of optional reset GPIO
Author: Vladimir Zapolskiy <vladimir.zapols...@linaro.org>
Date: Fri Aug 30 09:34:58 2024 +0300
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: Vladimir Zapolskiy <vladimir.zapols...@linaro.org>
Signed-off-by: Sakari Ailus <sakari.ai...@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>
drivers/media/i2c/og01a1b.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
---
diff --git a/drivers/media/i2c/og01a1b.c b/drivers/media/i2c/og01a1b.c
index ac719611b194..689e6a2db6ff 100644
--- a/drivers/media/i2c/og01a1b.c
+++ b/drivers/media/i2c/og01a1b.c
@@ -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)
