linux-kernel - [PATCH 2/4] dt-bindings: gpio: fairchild,74hc595: Add latch-gpios property

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Message-Id: <20241213-gpio74-v1-2-fa2c089caf41@posteo.net>
Date: Fri, 13 Dec 2024 18:32:48 +0100
From: J. Neuschäfer via B4 Relay <devnull+j.ne.posteo.net@...nel.org>
To: Linus Walleij <linus.walleij@...aro.org>, 
 Bartosz Golaszewski <brgl@...ev.pl>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Maxime Ripard <mripard@...nel.org>
Cc: linux-gpio@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 J. Neuschäfer <j.ne@...teo.net>
Subject: [PATCH 2/4] dt-bindings: gpio: fairchild,74hc595: Add latch-gpios
 property

From: "J. Neuschäfer" <j.ne@...teo.net>

The Fairchild MM74HC595 and other compatible parts have a latch clock
input (also known as storage register clock input), which must be
clocked once in order to apply any value that was serially shifted in.

This patch adds a latch-gpios property to the binding to allow
specifying a GPIO that connects to the latch clock.

Signed-off-by: J. Neuschäfer <j.ne@...teo.net>
---
 Documentation/devicetree/bindings/gpio/fairchild,74hc595.yaml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/gpio/fairchild,74hc595.yaml b/Documentation/devicetree/bindings/gpio/fairchild,74hc595.yaml
index 629cf9b2ab8e4a63fbe17f56792a46d2066d40c3..38d473a3852154e53faec88dc911dc0a4f9cbd1f 100644
--- a/Documentation/devicetree/bindings/gpio/fairchild,74hc595.yaml
+++ b/Documentation/devicetree/bindings/gpio/fairchild,74hc595.yaml
@@ -34,6 +34,10 @@ properties:
     description: GPIO connected to the OE (Output Enable) pin.
     maxItems: 1

+  latch-gpios:
+    description: GPIO connected to the latch clock or storage register clock pin.
+    maxItems: 1
+
 patternProperties:
   "^(hog-[0-9]+|.+-hog(-[0-9]+)?)$":
     type: object

-- 
2.45.2