Commit 0cbbbe09 authored by Wolfram Sang's avatar Wolfram Sang Committed by Johan Hovold
Browse files

gnss: ubx: add support for the reset gpio 



The Renesas KingFisher board includes a U-Blox Neo-M8 chip. This chip
has a reset pin which is also wired on the board. When Linux starts,
reset is asserted by the firmware. Deassert the reset pin when probing
this driver.

Signed-off-by: default avatarWolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
[ johan: rename gpio descriptor variable ]
Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
parent aba9f8b0

drivers/gnss/ubx.c

+9 −0
Original line number Diff line number Diff line
@@ -7,6 +7,7 @@ 


#include <linux/errno.h>

#include <linux/gnss.h>

#include <linux/gpio/consumer.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/module.h>
@@ -65,6 +66,7 @@ static const struct gnss_serial_ops ubx_gserial_ops = { 
static int ubx_probe(struct serdev_device *serdev)

{

	struct gnss_serial *gserial;

	struct gpio_desc *reset;

	struct ubx_data *data;

	int ret;
@@ -90,6 +92,13 @@ static int ubx_probe(struct serdev_device *serdev) 
	if (ret < 0 && ret != -ENODEV)

		goto err_free_gserial;



	/* Deassert reset */

	reset = devm_gpiod_get_optional(&serdev->dev, "reset", GPIOD_OUT_LOW);

	if (IS_ERR(reset)) {

		ret = PTR_ERR(reset);

		goto err_free_gserial;

	}



	ret = gnss_serial_register(gserial);

	if (ret)

		goto err_free_gserial;