linux-kernel - [PATCH 2/3] dt-bindings: display: sitronix,st7920: Add DT schema

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Message-Id: <20250806-st7920-v1-2-64ab5a34f9a0@gmail.com>
Date: Wed, 06 Aug 2025 14:48:10 +0200
From: Iker Pedrosa <ikerpedrosam@...il.com>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Javier Martinez Canillas <javierm@...hat.com>
Cc: linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 devicetree@...r.kernel.org, Iker Pedrosa <ikerpedrosam@...il.com>
Subject: [PATCH 2/3] dt-bindings: display: sitronix,st7920: Add DT schema

Add binding for Sitronix ST7920 display.

Signed-off-by: Iker Pedrosa <ikerpedrosam@...il.com>
---
 .../bindings/display/sitronix,st7920.yaml          | 55 ++++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/sitronix,st7920.yaml b/Documentation/devicetree/bindings/display/sitronix,st7920.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..caee85f98c6d242dfab73729210f8c34b23a3a99
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/sitronix,st7920.yaml
@@ -0,0 +1,55 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/sitronix,st7920.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Sitronix ST7920 LCD Display Controllers
+
+maintainers:
+  - Iker Pedrosa <ikerpedrosam@...il.com>
+
+description: |
+  The Sitronix ST7920 is a controller for monochrome dot-matrix graphical LCDs,
+  most commonly used for 128x64 pixel displays.
+  This binding supports connecting the display via a standard SPI bus.
+
+properties:
+  compatible:
+    const: sitronix,st7920
+
+  reg:
+    description: The chip-select number for the device on the SPI bus.
+    maxItems: 1
+
+  spi-max-frequency:
+    description: Maximum SPI clock frequency in Hz.
+    maximum: 600000
+
+  spi-cs-high:
+    type: boolean
+    description: Indicates the chip select is active high.
+
+required:
+  - compatible
+  - reg
+  - spi-max-frequency
+
+additionalProperties: false
+
+examples:
+  - |
+    // Example: ST7920 connected to an SPI bus
+    #include <dt-bindings/gpio/gpio.h>
+
+    spi0 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        display@0 {
+            compatible = "sitronix,st7920";
+            reg = <0>; // Chip select 0
+            spi-max-frequency = <600000>;
+            spi-cs-high;
+        };
+    };

-- 
2.50.1