mirrors/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-06 07:34:03 -04:00
Code Issues Packages Projects Releases Wiki Activity

media: hi556: Add support for external clock

Browse Source 
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 HP models with IPU6 +
hi556 sensor, the sensor driver must control the sensor's clock itself.

Add support for having the driver control an optional clock.

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
2024-04-15 15:10:37 +02:00
committed by Hans Verkuil
parent 860f262dd0
commit f9fc706352
1 changed files with 13 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/media/i2c/hi556.c
View File

@@ -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>
@@ -636,6 +637,7 @@ struct hi556 {
/* GPIOs, clocks, etc. */
struct gpio_desc *reset_gpio;
struct clk *clk;
/* Current mode */
const struct hi556_mode *cur_mode;
@@ -1286,6 +1288,7 @@ static int hi556_suspend(struct device *dev)
struct hi556 *hi556 = to_hi556(sd);
gpiod_set_value_cansleep(hi556->reset_gpio, 1);
clk_disable_unprepare(hi556->clk);
return 0;
}
@@ -1293,6 +1296,11 @@ static int hi556_resume(struct device *dev)
{
struct v4l2_subdev *sd = dev_get_drvdata(dev);
struct hi556 *hi556 = to_hi556(sd);
int ret;
ret = clk_prepare_enable(hi556->clk);
if (ret)
return ret;
gpiod_set_value_cansleep(hi556->reset_gpio, 0);
usleep_range(5000, 5500);
@@ -1324,6 +1332,11 @@ static int hi556_probe(struct i2c_client *client)
return dev_err_probe(&client->dev, PTR_ERR(hi556->reset_gpio),
"failed to get reset GPIO\n");
hi556->clk = devm_clk_get_optional(&client->dev, "clk");
if (IS_ERR(hi556->clk))
return dev_err_probe(&client->dev, PTR_ERR(hi556->clk),
"failed to get clock\n");
full_power = acpi_dev_state_d0(&client->dev);
if (full_power) {
/* Ensure non ACPI managed resources are enabled */