diff options
| author | Hans de Goede <hdegoede@redhat.com> | 2023-12-04 15:39:39 +0300 |
|---|---|---|
| committer | Hans Verkuil <hverkuil-cisco@xs4all.nl> | 2023-12-13 15:21:20 +0300 |
| commit | 846a37cf470f489ad1713e143083d17630c73056 (patch) | |
| tree | 1c07898394a09b9148960b88fbc285265a0a2610 /drivers/media | |
| parent | 1a140854bc8c9d258ddb31912b80f63faf760144 (diff) | |
| download | linux-846a37cf470f489ad1713e143083d17630c73056.tar.xz | |
media: ov2740: Add support for external clock
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>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/i2c/ov2740.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/media/i2c/ov2740.c b/drivers/media/i2c/ov2740.c index fef1b6f3f316..653cd96bb156 100644 --- a/drivers/media/i2c/ov2740.c +++ b/drivers/media/i2c/ov2740.c @@ -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); |