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gnss: ubx: add support for the safeboot gpio 

U-Blox M8/M9 chip have a pin to start it in safeboot mode, to be used
to recover from situations where the flash content has become
corrupted and needs to be restored. If this pin is asserted at power
up/reset, the receiver starts in safeboot mode and GNSS operation is
disabled.

Deassert the safeboot pin when probing this driver.

Signed-off-by: Alejandro Enrique <alejandroe1@geotab.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20250911-ubx-safeboot-v3-2-32fe6b882a3c@geotab.com
[ johan: deassert after requesting supplies ]
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Alejandro Enrique 2025-05-14 15:54:42 +02:00 committed by Johan Hovold
parent 0fc1b4b6fd
commit 955cd0545b
1 changed files with 8 additions and 0 deletions
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8
drivers/gnss/ubx.c
View File

@ -66,6 +66,7 @@ static const struct gnss_serial_ops ubx_gserial_ops = {
static int ubx_probe(struct serdev_device *serdev) static int ubx_probe(struct serdev_device *serdev)
{ {
struct gnss_serial *gserial; struct gnss_serial *gserial;
struct gpio_desc *safeboot;
struct gpio_desc *reset; struct gpio_desc *reset;
struct ubx_data *data; struct ubx_data *data;
int ret; int ret;
@ -92,6 +93,13 @@ static int ubx_probe(struct serdev_device *serdev)
if (ret < 0 && ret != -ENODEV) if (ret < 0 && ret != -ENODEV)
goto err_free_gserial; goto err_free_gserial;
/* Deassert safeboot */
safeboot = devm_gpiod_get_optional(&serdev->dev, "safeboot", GPIOD_OUT_LOW);
if (IS_ERR(safeboot)) {
ret = PTR_ERR(safeboot);
goto err_free_gserial;
}
/* Deassert reset */ /* Deassert reset */
reset = devm_gpiod_get_optional(&serdev->dev, "reset", GPIOD_OUT_LOW); reset = devm_gpiod_get_optional(&serdev->dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(reset)) { if (IS_ERR(reset)) {