diff options
| author | Pawe? Chmiel <pawel.mikolaj.chmiel@gmail.com> | 2018-12-07 14:58:11 +0100 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2019-01-21 18:36:18 +0100 |
| commit | 1c64222be9ad0e56ad9a222b35e063d481f58cfc (patch) | |
| tree | 238e8bd463d4aa9effccb2627f66ce9520d90854 | |
| parent | media: si470x-i2c: Use managed resource helpers (diff) | |
| download | linux-1c64222be9ad0e56ad9a222b35e063d481f58cfc.tar.xz linux-1c64222be9ad0e56ad9a222b35e063d481f58cfc.zip | |
media: si470x-i2c: Add optional reset-gpio support
If reset-gpio is defined, use it to bring device out of reset.
Without this, it's not possible to access si470x registers.
Signed-off-by: Pawe? Chmiel <pawel.mikolaj.chmiel@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
| -rw-r--r-- | drivers/media/radio/si470x/radio-si470x-i2c.c | 15 | ||||
| -rw-r--r-- | drivers/media/radio/si470x/radio-si470x.h | 1 |
2 files changed, 16 insertions, 0 deletions
diff --git a/drivers/media/radio/si470x/radio-si470x-i2c.c b/drivers/media/radio/si470x/radio-si470x-i2c.c index a7ac09c55188..15eea2b2c90f 100644 --- a/drivers/media/radio/si470x/radio-si470x-i2c.c +++ b/drivers/media/radio/si470x/radio-si470x-i2c.c @@ -28,6 +28,7 @@ #include <linux/i2c.h> #include <linux/slab.h> #include <linux/delay.h> +#include <linux/gpio/consumer.h> #include <linux/interrupt.h> #include "radio-si470x.h" @@ -392,6 +393,17 @@ static int si470x_i2c_probe(struct i2c_client *client, radio->videodev.release = video_device_release_empty; video_set_drvdata(&radio->videodev, radio); + radio->gpio_reset = devm_gpiod_get_optional(&client->dev, "reset", + GPIOD_OUT_LOW); + if (IS_ERR(radio->gpio_reset)) { + retval = PTR_ERR(radio->gpio_reset); + dev_err(&client->dev, "Failed to request gpio: %d\n", retval); + goto err_all; + } + + if (radio->gpio_reset) + gpiod_set_value(radio->gpio_reset, 1); + /* power up : need 110ms */ radio->registers[POWERCFG] = POWERCFG_ENABLE; if (si470x_set_register(radio, POWERCFG) < 0) { @@ -478,6 +490,9 @@ static int si470x_i2c_remove(struct i2c_client *client) video_unregister_device(&radio->videodev); + if (radio->gpio_reset) + gpiod_set_value(radio->gpio_reset, 0); + return 0; } diff --git a/drivers/media/radio/si470x/radio-si470x.h b/drivers/media/radio/si470x/radio-si470x.h index 35fa0f3bbdd2..6fd6a399cb77 100644 --- a/drivers/media/radio/si470x/radio-si470x.h +++ b/drivers/media/radio/si470x/radio-si470x.h @@ -189,6 +189,7 @@ struct si470x_device { #if IS_ENABLED(CONFIG_I2C_SI470X) struct i2c_client *client; + struct gpio_desc *gpio_reset; #endif }; |