linux-kernel - [PATCH v2] dt-bindings: gnss: u-blox: use open-drain reset and safeboot in example

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Message-ID: <20251114155413.11949-1-johan@kernel.org>
Date: Fri, 14 Nov 2025 16:54:13 +0100
From: Johan Hovold <johan@...nel.org>
To: Johan Hovold <johan@...nel.org>
Cc: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Alejandro Enrique <alejandroe1@...tab.com>,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2] dt-bindings: gnss: u-blox: use open-drain reset and safeboot in example

The RESET_N and SAFEBOOT_N pins should typically be left open and only
be connected to ground in rare cases where a device is misbehaving.

Specify GPIO_OPEN_DRAIN in the example as this is what should generally
be used.

Note that the current Linux driver implementation depends on these pins
being declared open-drain so that they are not driven while the main
supply is off.

Signed-off-by: Johan Hovold <johan@...nel.org>
---

Changes in v2:
 - declare the pins as both active-low and open-drain (as the former is
   no longer implied by the latter)


 Documentation/devicetree/bindings/gnss/u-blox,neo-6m.yaml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/gnss/u-blox,neo-6m.yaml b/Documentation/devicetree/bindings/gnss/u-blox,neo-6m.yaml
index 9f14cfe7efd1..d016808f65cb 100644
--- a/Documentation/devicetree/bindings/gnss/u-blox,neo-6m.yaml
+++ b/Documentation/devicetree/bindings/gnss/u-blox,neo-6m.yaml
@@ -67,7 +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>;
-            safeboot-gpios = <&gpio 2 GPIO_ACTIVE_LOW>;
+            reset-gpios = <&gpio 1 (GPIO_ACTIVE_LOW | GPIO_OPEN_DRAIN)>;
+            safeboot-gpios = <&gpio 2 (GPIO_ACTIVE_LOW | GPIO_OPEN_DRAIN)>;
         };
     };
-- 
2.51.0