linux-kernel - [PATCH v4 06/14] dt-bindings: display: bridge: Add i.MX8qm/qxp display pixel link binding

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Date:   Thu, 18 Feb 2021 11:41:47 +0800
From:   Liu Ying <victor.liu@....com>
To:     dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org
Cc:     airlied@...ux.ie, daniel@...ll.ch, robh+dt@...nel.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com, mchehab@...nel.org,
        a.hajda@...sung.com, narmstrong@...libre.com,
        Laurent.pinchart@...asonboard.com, jonas@...boo.se,
        jernej.skrabec@...l.net, kishon@...com, vkoul@...nel.org
Subject: [PATCH v4 06/14] dt-bindings: display: bridge: Add i.MX8qm/qxp display pixel link binding

This patch adds bindings for i.MX8qm/qxp display pixel link.

Reviewed-by: Rob Herring <robh@...nel.org>
Signed-off-by: Liu Ying <victor.liu@....com>
---
v3->v4:
* No change.

v2->v3:
* Add Rob's R-b tag.

v1->v2:
* Use graph schema. (Laurent)
* Require all four pixel link output ports. (Laurent)
* Mention pixel link is accessed via SCU firmware. (Rob)

 .../display/bridge/fsl,imx8qxp-pixel-link.yaml     | 106 +++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-pixel-link.yaml

diff --git a/Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-pixel-link.yaml b/Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-pixel-link.yaml
new file mode 100644
index 00000000..3af67cc
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-pixel-link.yaml
@@ -0,0 +1,106 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/bridge/fsl,imx8qxp-pixel-link.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale i.MX8qm/qxp Display Pixel Link
+
+maintainers:
+  - Liu Ying <victor.liu@....com>
+
+description: |
+  The Freescale i.MX8qm/qxp Display Pixel Link(DPL) forms a standard
+  asynchronous linkage between pixel sources(display controller or
+  camera module) and pixel consumers(imaging or displays).
+  It consists of two distinct functions, a pixel transfer function and a
+  control interface.  Multiple pixel channels can exist per one control channel.
+  This binding documentation is only for pixel links whose pixel sources are
+  display controllers.
+
+  The i.MX8qm/qxp Display Pixel Link is accessed via System Controller Unit(SCU)
+  firmware.
+
+properties:
+  compatible:
+    enum:
+      - fsl,imx8qm-dc-pixel-link
+      - fsl,imx8qxp-dc-pixel-link
+
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    properties:
+      port@0:
+        $ref: /schemas/graph.yaml#/properties/port
+        description: The pixel link input port node from upstream video source.
+
+    patternProperties:
+      "^port@[1-4]$":
+        $ref: /schemas/graph.yaml#/properties/port
+        description: The pixel link output port node to downstream bridge.
+
+    required:
+      - port@0
+      - port@1
+      - port@2
+      - port@3
+      - port@4
+
+required:
+  - compatible
+  - ports
+
+additionalProperties: false
+
+examples:
+  - |
+    dc0-pixel-link0 {
+        compatible = "fsl,imx8qxp-dc-pixel-link";
+
+        ports {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            /* from dc0 pixel combiner channel0 */
+            port@0 {
+                reg = <0>;
+
+                dc0_pixel_link0_dc0_pixel_combiner_ch0: endpoint {
+                    remote-endpoint = <&dc0_pixel_combiner_ch0_dc0_pixel_link0>;
+                };
+            };
+
+            /* to PXL2DPIs in MIPI/LVDS combo subsystems */
+            port@1 {
+                #address-cells = <1>;
+                #size-cells = <0>;
+                reg = <1>;
+
+                dc0_pixel_link0_mipi_lvds_0_pxl2dpi: endpoint@0 {
+                    reg = <0>;
+                    remote-endpoint = <&mipi_lvds_0_pxl2dpi_dc0_pixel_link0>;
+                };
+
+                dc0_pixel_link0_mipi_lvds_1_pxl2dpi: endpoint@1 {
+                    reg = <1>;
+                    remote-endpoint = <&mipi_lvds_1_pxl2dpi_dc0_pixel_link0>;
+                };
+            };
+
+            /* unused */
+            port@2 {
+                reg = <2>;
+            };
+
+            /* unused */
+            port@3 {
+                reg = <3>;
+            };
+
+            /* to imaging subsystem */
+            port@4 {
+                reg = <4>;
+            };
+        };
+    };
-- 
2.7.4