linux-kernel - [PATCH 1/6] dt-bindings: display: add Amlogic MIPI DSI Host Controller bindings

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Message-Id: <20220107145515.613009-2-narmstrong@baylibre.com>
Date:   Fri,  7 Jan 2022 15:55:10 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org
Cc:     linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Neil Armstrong <narmstrong@...libre.com>
Subject: [PATCH 1/6] dt-bindings: display: add Amlogic MIPI DSI Host Controller bindings

The Amlogic G12A, G12B & SM1 SoCs embeds a Synopsys DW-MIPI-DSI transceiver (ver 1.21a),
with a custom glue managing the IP resets, clock and data input similar to the DW-HDMI Glue
on the same Amlogic SoCs.

Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
---
 .../display/amlogic,meson-dw-mipi-dsi.yaml    | 118 ++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/amlogic,meson-dw-mipi-dsi.yaml

diff --git a/Documentation/devicetree/bindings/display/amlogic,meson-dw-mipi-dsi.yaml b/Documentation/devicetree/bindings/display/amlogic,meson-dw-mipi-dsi.yaml
new file mode 100644
index 000000000000..f3070783d606
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/amlogic,meson-dw-mipi-dsi.yaml
@@ -0,0 +1,118 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright 2020 BayLibre, SAS
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/display/amlogic,meson-dw-mipi-dsi.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Amlogic specific extensions to the Synopsys Designware MIPI DSI Host Controller
+
+maintainers:
+  - Neil Armstrong <narmstrong@...libre.com>
+
+description: |
+  The Amlogic Meson Synopsys Designware Integration is composed of
+  - A Synopsys DesignWare MIPI DSI Host Controller IP
+  - A TOP control block controlling the Clocks & Resets of the IP
+
+allOf:
+  - $ref: dsi-controller.yaml#
+
+properties:
+  compatible:
+    enum:
+      - amlogic,meson-g12a-dw-mipi-dsi
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    minItems: 2
+
+  clock-names:
+    minItems: 2
+    items:
+      - const: pclk
+      - const: px_clk
+      - const: meas_clk
+
+  resets:
+    minItems: 1
+
+  reset-names:
+    items:
+      - const: top
+
+  phys:
+    minItems: 1
+
+  phy-names:
+    items:
+      - const: dphy
+
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    properties:
+      port@0:
+        $ref: /schemas/graph.yaml#/$defs/port-base
+        unevaluatedProperties: false
+        description: Input node to receive pixel data.
+
+      port@1:
+        $ref: /schemas/graph.yaml#/$defs/port-base
+        unevaluatedProperties: false
+        description: DSI output node to panel.
+
+    required:
+      - port@0
+      - port@1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - resets
+  - reset-names
+  - phys
+  - phy-names
+  - ports
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    dsi@...0 {
+          compatible = "amlogic,meson-g12a-dw-mipi-dsi";
+          reg = <0x6000 0x400>;
+          resets = <&reset_top>;
+          reset-names = "top";
+          clocks = <&clk_pclk>, <&clk_px>;
+          clock-names = "pclk", "px_clk";
+          phys = <&mipi_dphy>;
+          phy-names = "dphy";
+
+          ports {
+              #address-cells = <1>;
+              #size-cells = <0>;
+
+              /* VPU VENC Input */
+              mipi_dsi_venc_port: port@0 {
+                  reg = <0>;
+
+                  mipi_dsi_in: endpoint {
+                       remote-endpoint = <&dpi_out>;
+                  };
+              };
+
+              /* DSI Output */
+              mipi_dsi_panel_port: port@1 {
+                  reg = <1>;
+
+                  mipi_out_panel: endpoint {
+                      remote-endpoint = <&mipi_in_panel>;
+                  };
+              };
+          };
+    };
-- 
2.25.1