linux-kernel - [PATCH v2 1/2] dt-bindings: display: bridge: Document Solomon SSD2825

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Message-ID: <20250217140910.108175-2-clamor95@gmail.com>
Date: Mon, 17 Feb 2025 16:09:09 +0200
From: Svyatoslav Ryhel <clamor95@...il.com>
To: Andrzej Hajda <andrzej.hajda@...el.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Robert Foss <rfoss@...nel.org>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	Jonas Karlman <jonas@...boo.se>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	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>,
	Svyatoslav Ryhel <clamor95@...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: bridge: Document Solomon SSD2825

Add bindings for Solomon SSD2825 MIPI master bridge chip that connects an
application processor with traditional parallel LCD interface and an LCD
driver with MIPI slave interface. The SSD2825 supports both parallel RGB
interface and serial SPI interface.

Signed-off-by: Svyatoslav Ryhel <clamor95@...il.com>
---
 .../display/bridge/solomon,ssd2825.yaml       | 141 ++++++++++++++++++
 1 file changed, 141 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/bridge/solomon,ssd2825.yaml

diff --git a/Documentation/devicetree/bindings/display/bridge/solomon,ssd2825.yaml b/Documentation/devicetree/bindings/display/bridge/solomon,ssd2825.yaml
new file mode 100644
index 000000000000..e2d293d623b8
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/bridge/solomon,ssd2825.yaml
@@ -0,0 +1,141 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/bridge/solomon,ssd2825.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Solomon SSD2825 RGB to MIPI-DSI bridge
+
+maintainers:
+  - Svyatoslav Ryhel <clamor95@...il.com>
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+properties:
+  compatible:
+    const: solomon,ssd2825
+
+  reg:
+    maxItems: 1
+
+  reset-gpios: true
+
+  dvdd-supply:
+    description: Regulator for 1.2V digital power supply.
+
+  avdd-supply:
+    description: Regulator for 1.2V analog power supply.
+
+  vddio-supply:
+    description: Regulator for 1.8V IO power supply.
+
+  spi-max-frequency:
+    maximum: 1000000
+
+  spi-cpha: true
+  spi-cpol: true
+
+  clocks:
+    maxItems: 1
+    description: Reference TX_CLK used before PLL is locked.
+
+  solomon,hs-zero-delay-ns:
+    description:
+      HS zero delay period
+    minimum: 0
+    maximum: 1700
+    default: 133
+
+  solomon,hs-prep-delay-ns:
+    description:
+      HS prep delay period
+    minimum: 0
+    maximum: 1728
+    default: 40
+
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    properties:
+      port@0:
+        $ref: /schemas/graph.yaml#/$defs/port-base
+        unevaluatedProperties: false
+        description:
+          Video port for RGB input
+
+        properties:
+          endpoint:
+            $ref: /schemas/graph.yaml#/$defs/endpoint-base
+            unevaluatedProperties: false
+
+            properties:
+              bus-width:
+                enum: [ 16, 18, 24 ]
+
+      port@1:
+        $ref: /schemas/graph.yaml#/properties/port
+        description:
+          Video port for DSI output (panel or connector)
+
+    required:
+      - port@0
+      - port@1
+
+required:
+  - compatible
+  - ports
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        dsi@2 {
+            compatible = "solomon,ssd2825";
+            reg = <2>;
+
+            spi-max-frequency = <1000000>;
+
+            spi-cpha;
+            spi-cpol;
+
+            reset-gpios = <&gpio 114 GPIO_ACTIVE_LOW>;
+
+            dvdd-supply = <&vdd_1v2>;
+            avdd-supply = <&vdd_1v2>;
+            vddio-supply = <&vdd_1v8_io>;
+
+            solomon,hs-zero-delay-ns = <300>;
+            solomon,hs-prep-delay-ns = <65>;
+
+            clocks = <&ssd2825_tx_clk>;
+
+            ports {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                port@0 {
+                    reg = <0>;
+
+                    bridge_input: endpoint {
+                        remote-endpoint = <&dpi_output>;
+                        bus-width = <24>;
+                    };
+                };
+
+                port@1 {
+                    reg = <1>;
+
+                    bridge_output: endpoint {
+                        remote-endpoint = <&panel_input>;
+                    };
+                };
+            };
+        };
+    };
-- 
2.43.0