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

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Message-ID: <20240725004734.644986-2-lanzano.alex@gmail.com>
Date: Wed, 24 Jul 2024 20:47:02 -0400
From: Alex Lanzano <lanzano.alex@...il.com>
To: mehdi.djait@...tlin.com,
	Alex Lanzano <lanzano.alex@...il.com>,
	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>
Cc: dri-devel@...ts.freedesktop.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 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>
---
 .../bindings/display/sharp,sharp-memory.yaml  | 97 +++++++++++++++++++
 include/dt-bindings/display/sharp-memory.h    |  9 ++
 2 files changed, 106 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/sharp,sharp-memory.yaml
 create mode 100644 include/dt-bindings/display/sharp-memory.h

diff --git a/Documentation/devicetree/bindings/display/sharp,sharp-memory.yaml b/Documentation/devicetree/bindings/display/sharp,sharp-memory.yaml
new file mode 100644
index 000000000000..a79edd97c857
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/sharp,sharp-memory.yaml
@@ -0,0 +1,97 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/sharp,sharp-memory.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Sharp Memory LCD panels
+
+maintainers:
+  - Alex Lanzano <lanzano.alex@...il.com>
+
+description:
+  This binding is for the Sharp Memory LCD monochrome displays.
+
+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
+
+  vcom-mode:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: |
+      VCOM is a signal that prevents DC bias from being built up in
+      the panel resulting in pixels being forever stuck in one state.
+      vcom-mode can be set to one of three modes
+
+      SHARP_MEMORY_SOFTWARE_VCOM - This method uses a kthread to periodically send a
+      "maintain display" message to the display, toggling the vcom
+      bit on and off with each message
+
+      SHARP_MEMORY_EXTERNAL_VCOM - This method relies on an external clock to generate
+      the signal on the EXTCOMM pin
+
+      SHARP_MEMORY_PWM_VCOM - This method uses a pwm device to generate the signal
+      on the EXTCOMM pin
+
+    enum: [ 0, 1, 2 ]
+
+  enable-gpios:
+    maxItems: 1
+    description: Enables display
+
+  pwms:
+    maxItems: 1
+    description: External VCOM signal
+
+required:
+  - compatible
+  - reg
+  - spi-cs-high
+  - vcom-mode
+
+if:
+  properties:
+    vcom-mode:
+      # SHARP_MEMORY_PWM_VCOM
+      enum: [2]
+then:
+  required:
+    - pwms
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/display/sharp-memory.h>
+
+    spi {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            display@0{
+                    compatible = "sharp,ls013b7dh03";
+                    reg = <0>;
+                    spi-cs-high;
+                    spi-max-frequency = <1000000>;
+                    vcom-mode = <SHARP_MEMORY_SOFTWARE_VCOM>;
+            };
+    };
+...
diff --git a/include/dt-bindings/display/sharp-memory.h b/include/dt-bindings/display/sharp-memory.h
new file mode 100644
index 000000000000..dea14c7bd7ec
--- /dev/null
+++ b/include/dt-bindings/display/sharp-memory.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
+#ifndef _DT_BINDINGS_SHARP_MEMORY
+#define _DT_BINDINGS_SHARP_MEMORY
+
+#define SHARP_MEMORY_SOFTWARE_VCOM	0
+#define SHARP_MEMORY_EXTERNAL_VCOM	1
+#define SHARP_MEMORY_PWM_VCOM		2
+
+#endif
-- 
2.45.2