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media: ov2740: Add support for external clock

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On some ACPI platforms, such as Chromebooks the ACPI methods to
change the power-state (_PS0 and _PS3) fully take care of powering
on/off the sensor.

On other ACPI platforms, such as e.g. various ThinkPad models with
IPU6 + ov2740 sensor, the sensor driver must control the reset GPIO
and the sensor's clock itself.

Add support for having the driver control an optional clock.

Reviewed-by: Bingbu Cao <bingbu.cao@intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
This commit is contained in:
Hans de Goede 2023-12-04 13:39:39 +01:00 committed by Hans Verkuil
parent 1a140854bc
commit 846a37cf47
1 changed files with 13 additions and 0 deletions
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13
drivers/media/i2c/ov2740.c
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@ -3,6 +3,7 @@
#include <asm/unaligned.h>
#include <linux/acpi.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
@ -336,6 +337,7 @@ struct ov2740 {
/* GPIOs, clocks */
struct gpio_desc *reset_gpio;
struct clk *clk;
/* Current mode */
const struct ov2740_mode *cur_mode;
@ -1071,6 +1073,7 @@ static int ov2740_suspend(struct device *dev)
struct ov2740 *ov2740 = to_ov2740(sd);
gpiod_set_value_cansleep(ov2740->reset_gpio, 1);
clk_disable_unprepare(ov2740->clk);
return 0;
}
@ -1078,6 +1081,11 @@ static int ov2740_resume(struct device *dev)
{
struct v4l2_subdev *sd = dev_get_drvdata(dev);
struct ov2740 *ov2740 = to_ov2740(sd);
int ret;
ret = clk_prepare_enable(ov2740->clk);
if (ret)
return ret;
gpiod_set_value_cansleep(ov2740->reset_gpio, 0);
msleep(20);
@ -1105,6 +1113,11 @@ static int ov2740_probe(struct i2c_client *client)
return dev_err_probe(dev, PTR_ERR(ov2740->reset_gpio),
"failed to get reset GPIO\n");
ov2740->clk = devm_clk_get_optional(dev, "clk");
if (IS_ERR(ov2740->clk))
return dev_err_probe(dev, PTR_ERR(ov2740->clk),
"failed to get clock\n");
v4l2_i2c_subdev_init(&ov2740->sd, client, &ov2740_subdev_ops);
ov2740->sd.internal_ops = &ov2740_internal_ops;
full_power = acpi_dev_state_d0(&client->dev);