GNSS updates for 6.19-rc1

Here are the GNSS updates for 6.19-rc1, including:
 
  - add support for claiming and deasserting the safeboot pin found on
    recent u-blox receivers
  - fix timepulse pin description in the devicetree binding
 
 Included are also some related binding updates.
 
 All have been in linux-next with no reported issues.
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Merge tag 'gnss-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/johan/gnss

Pull GNSS updates from Johan Hovold:

 - add support for claiming and deasserting the safeboot pin found on
   recent u-blox receivers

 - fix timepulse pin description in the devicetree binding

... and some related binding updates

* tag 'gnss-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/johan/gnss:
  dt-bindings: gnss: fix timepulse description
  dt-bindings: gnss: u-blox: use lowercase company name
  dt-bindings: gnss: u-blox: use open-drain reset and safeboot in example
  gnss: ubx: add support for the safeboot gpio
  dt-bindings: gnss: u-blox: add safeboot gpio

Documentation/devicetree/bindings/gnss/gnss-common.yaml

@@ -31,8 +31,7 @@ properties:
     maxItems: 1
 
   timepulse-gpios:
-    description: When a timepulse is provided to the GNSS device using a
+    description: Timepulse signal
-      GPIO line, this is used.
     maxItems: 1
 
 additionalProperties: true

Documentation/devicetree/bindings/gnss/u-blox,neo-6m.yaml

@@ -4,7 +4,7 @@
 $id: http://devicetree.org/schemas/gnss/u-blox,neo-6m.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: U-blox GNSS Receiver
+title: u-blox GNSS receiver
 
 allOf:
   - $ref: gnss-common.yaml#
@@ -14,7 +14,7 @@ maintainers:
   - Johan Hovold <johan@kernel.org>
 
 description: >
-  The U-blox GNSS receivers can use UART, DDC (I2C), SPI and USB interfaces.
+  The u-blox GNSS receivers can use UART, DDC (I2C), SPI and USB interfaces.
 
 properties:
   compatible:
@@ -36,6 +36,9 @@ properties:
   reset-gpios:
     maxItems: 1
 
+  safeboot-gpios:
+    maxItems: 1
+
   vcc-supply:
     description: >
       Main voltage regulator
@@ -64,6 +67,7 @@ examples:
             compatible = "u-blox,neo-8";
             v-bckp-supply = <&gnss_v_bckp_reg>;
             vcc-supply = <&gnss_vcc_reg>;
-            reset-gpios = <&gpio 1 GPIO_ACTIVE_LOW>;
+            reset-gpios = <&gpio 1 (GPIO_ACTIVE_LOW | GPIO_OPEN_DRAIN)>;
+            safeboot-gpios = <&gpio 2 (GPIO_ACTIVE_LOW | GPIO_OPEN_DRAIN)>;
         };
     };

drivers/gnss/ubx.c

@@ -66,6 +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 *safeboot;
 	struct gpio_desc *reset;
 	struct ubx_data *data;
 	int ret;
@@ -92,6 +93,13 @@ static int ubx_probe(struct serdev_device *serdev)
 	if (ret < 0 && ret != -ENODEV)
 		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 */
 	reset = devm_gpiod_get_optional(&serdev->dev, "reset", GPIOD_OUT_LOW);
 	if (IS_ERR(reset)) {