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media: si470x-i2c: Add optional reset-gpio support

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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>
This commit is contained in:
Pawe? Chmiel 2018-12-07 11:58:11 -02:00 committed by Mauro Carvalho Chehab
parent f86c51b66b
commit 1c64222be9
2 changed files with 16 additions and 0 deletions
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15
drivers/media/radio/si470x/radio-si470x-i2c.c
View File

@ -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;
}

1
drivers/media/radio/si470x/radio-si470x.h
View File

@ -189,6 +189,7 @@ struct si470x_device {
#if IS_ENABLED(CONFIG_I2C_SI470X)
struct i2c_client *client;
struct gpio_desc *gpio_reset;
#endif
};