diff options
| author | Wolfram Sang <wsa+renesas@sang-engineering.com> | 2023-11-13 01:51:51 +0100 |
|---|---|---|
| committer | Johan Hovold <johan@kernel.org> | 2023-12-15 09:29:54 +0100 |
| commit | 0cbbbe09d49b959d0225f7f2223a8ae3b2c1964c (patch) | |
| tree | cbde5b0f224b35b54bef714d870af13935467dd3 /drivers/gnss | |
| parent | dt-bindings: gnss: u-blox: add "reset-gpios" binding (diff) | |
| download | linux-0cbbbe09d49b959d0225f7f2223a8ae3b2c1964c.tar.xz linux-0cbbbe09d49b959d0225f7f2223a8ae3b2c1964c.zip | |
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: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
[ johan: rename gpio descriptor variable ]
Signed-off-by: Johan Hovold <johan@kernel.org>
Diffstat (limited to 'drivers/gnss')
| -rw-r--r-- | drivers/gnss/ubx.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/gnss/ubx.c b/drivers/gnss/ubx.c index 9b76b101ba5e..92402f6082c4 100644 --- a/drivers/gnss/ubx.c +++ b/drivers/gnss/ubx.c @@ -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; |