Commit 1c64222b authored by Pawe? Chmiel's avatar Pawe? Chmiel Committed by Mauro Carvalho Chehab
Browse files

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: default avatarPawe? Chmiel <pawel.mikolaj.chmiel@gmail.com>
Signed-off-by: default avatarHans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab+samsung@kernel.org>
parent f86c51b6

drivers/media/radio/si470x/radio-si470x-i2c.c

+15 −0
Original line number Diff line number Diff line
@@ -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;

}

drivers/media/radio/si470x/radio-si470x.h

+1 −0
Original line number Diff line number Diff line
@@ -189,6 +189,7 @@ struct si470x_device { 


#if IS_ENABLED(CONFIG_I2C_SI470X)

	struct i2c_client *client;

	struct gpio_desc *gpio_reset;

#endif

};

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