linux-kernel - [PATCH v7 1/2] dt-bindings: display: Add Sharp Memory LCD bindings

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Message-ID: <20240923162205.55658-2-lanzano.alex@gmail.com>
Date: Mon, 23 Sep 2024 12:21:34 -0400
From: Alex Lanzano <lanzano.alex@...il.com>
To: dmitry.baryshkov@...aro.org,
	Alex Lanzano <lanzano.alex@...il.com>,
	David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Uwe Kleine-König <ukleinek@...nel.org>,
	Mehdi Djait <mehdi.djait@...tlin.com>
Cc: skhan@...uxfoundation.org,
	linux-kernel-mentees@...ts.linuxfoundation.org,
	christophe.jaillet@...adoo.fr,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	dri-devel@...ts.freedesktop.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-pwm@...r.kernel.org
Subject: [PATCH v7 1/2] dt-bindings: display: Add Sharp Memory LCD bindings

Add device tree bindings for the monochrome Sharp Memory LCD

Co-developed-by: Mehdi Djait <mehdi.djait@...tlin.com>
Signed-off-by: Mehdi Djait <mehdi.djait@...tlin.com>
Signed-off-by: Alex Lanzano <lanzano.alex@...il.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
 .../bindings/display/sharp,ls010b7dh04.yaml   | 92 +++++++++++++++++++
 1 file changed, 92 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..8097f091c2a5
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/sharp,ls010b7dh04.yaml
@@ -0,0 +1,92 @@
+# 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. 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-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
+
+    enum: [software, external, pwm]
+
+  enable-gpios: true
+
+  pwms:
+    maxItems: 1
+    description: External VCOM signal
+
+required:
+  - compatible
+  - reg
+  - 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
+
+unevaluatedProperties: 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";
+        };
+    };
+...
-- 
2.46.0