linux-kernel - [PATCH v2 1/2] dt-bindings: display: Add Sharp Memory LCD bindings

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Message-ID: <20240726194456.1336484-2-lanzano.alex@gmail.com>
Date: Fri, 26 Jul 2024 15:44:25 -0400
From: Alex Lanzano <lanzano.alex@...il.com>
To: mehdi.djait@...tlin.com,
	christophe.jaillet@...adoo.fr,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Alex Lanzano <lanzano.alex@...il.com>
Cc: dri-devel@...ts.freedesktop.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] dt-bindings: display: Add Sharp Memory LCD bindings

Add device tree bindings for the monochrome Sharp Memory LCD

Signed-off-by: Alex Lanzano <lanzano.alex@...il.com>
Co-developed-by: Mehdi Djait <mehdi.djait@...tlin.com>
Signed-off-by: Mehdi Djait <mehdi.djait@...tlin.com>
---
 .../bindings/display/sharp,ls010b7dh04.yaml   | 94 +++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/sharp,ls010b7dh04.yaml

diff --git a/Documentation/devicetree/bindings/display/sharp,ls010b7dh04.yaml b/Documentation/devicetree/bindings/display/sharp,ls010b7dh04.yaml
new file mode 100644
index 000000000000..79bde7bf0d7d
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/sharp,ls010b7dh04.yaml
@@ -0,0 +1,94 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/sharp,ls010b7dh04.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Sharp Memory LCD panels
+
+maintainers:
+  - Alex Lanzano <lanzano.alex@...il.com>
+
+description:
+  Sharp Memory LCDs are a series of monochrome displays that operate over
+  a SPI bus when the chip select is high. The displays require a signal (VCOM)
+  to be generated to prevent DC bias build up resulting in pixels being
+  unable to change. Three modes can be used to provide the VCOM signal
+  ("software", "external", "pwm").
+
+properties:
+  compatible:
+    enum:
+      - sharp,ls010b7dh04
+      - sharp,ls011b7dh03
+      - sharp,ls012b7dd01
+      - sharp,ls013b7dh03
+      - sharp,ls013b7dh05
+      - sharp,ls018b7dh02
+      - sharp,ls027b7dh01
+      - sharp,ls027b7dh01a
+      - sharp,ls032b7dd02
+      - sharp,ls044q7dh01
+
+  reg:
+    maxItems: 1
+
+  spi-cs-high: true
+
+  spi-max-frequency:
+    maximum: 2000000
+
+  sharp,vcom-mode:
+    $ref: /schemas/types.yaml#/definitions/string
+    description: |
+      software - This mode relies on a software operation to send a
+      "maintain display" message to the display, toggling the vcom
+      bit on and off with each message
+
+      external - This mode relies on an external clock to generate
+      the signal on the EXTCOMM pin
+
+      pwm - This mode relies on a pwm device to generate the signal
+      on the EXTCOMM pin
+
+  enable-gpios: true
+
+  pwms:
+    maxItems: 1
+    description: External VCOM signal
+
+required:
+  - compatible
+  - reg
+  - spi-cs-high
+  - sharp,vcom-mode
+
+allOf:
+  - $ref: panel/panel-common.yaml#
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+  - if:
+      properties:
+        sharp,vcom-mode:
+          const: pwm
+    then:
+      required:
+        - pwms
+
+additionalProperties: false
+
+examples:
+  - |
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        display@0{
+            compatible = "sharp,ls013b7dh03";
+            reg = <0>;
+            spi-cs-high;
+            spi-max-frequency = <1000000>;
+            sharp,vcom-mode = "software";
+        };
+    };
+...
-- 
2.45.2