[PATCH v4 1/2] dt-bindings: display: bridge: ldb: Implement simple Freescale i.MX8MP LDB bridge

[Marek Vasut]

The i.MX8MP contains two syscon registers which are responsible
for configuring the on-SoC DPI-to-LVDS serializer. Add DT binding
which represents this serializer as a bridge.

Acked-by: Sam Ravnborg <sam at ravnborg.org>
Signed-off-by: Marek Vasut <marex at denx.de>
Cc: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
Cc: Lucas Stach <l.stach at pengutronix.de>
Cc: Maxime Ripard <maxime at cerno.tech>
Cc: Peng Fan <peng.fan at nxp.com>
Cc: Rob Herring <robh+dt at kernel.org>
Cc: Robby Cai <robby.cai at nxp.com>
Cc: Robert Foss <robert.foss at linaro.org>
Cc: Sam Ravnborg <sam at ravnborg.org>
Cc: Thomas Zimmermann <tzimmermann at suse.de>
Cc: devicetree at vger.kernel.org
To: dri-devel at lists.freedesktop.org
---
V2: - Consistently use fsl,imx8mp-ldb as compatible
    - Drop items: from compatible:
    - Replace minItems with maxItems in clocks:
    - Drop quotes from clock-names const: ldb
    - Rename syscon to fsl,syscon
    - Use generic name of ldb-lvds in example
V3: - Add AB from Sam
    - Consistently use MX8MP
V4: - Rename to fsl-ldb all over the place
    - Put the LDB node under media block controller in the example
---
 .../bindings/display/bridge/fsl,ldb.yaml      | 92 +++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml

diff --git a/Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml b/Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml
new file mode 100644
index 000000000000..77f174eee424
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/bridge/fsl,ldb.yaml
@@ -0,0 +1,92 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/bridge/fsl,ldb.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale i.MX8MP DPI to LVDS bridge chip
+
+maintainers:
+  - Marek Vasut <marex at denx.de>
+
+description: |
+  The i.MX8MP mediamix contains two registers which are responsible
+  for configuring the on-SoC DPI-to-LVDS serializer. This describes
+  those registers as bridge within the DT.
+
+properties:
+  compatible:
+    const: fsl,imx8mp-ldb
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    const: ldb
+
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    properties:
+      port at 0:
+        $ref: /schemas/graph.yaml#/properties/port
+        description: Video port for DPI input.
+
+      port at 1:
+        $ref: /schemas/graph.yaml#/properties/port
+        description: Video port for LVDS Channel-A output (panel or bridge).
+
+      port at 2:
+        $ref: /schemas/graph.yaml#/properties/port
+        description: Video port for LVDS Channel-B output (panel or bridge).
+
+    required:
+      - port at 0
+      - port at 1
+
+required:
+  - compatible
+  - clocks
+  - ports
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/imx8mp-clock.h>
+
+    blk-ctrl {
+        bridge {
+            compatible = "fsl,imx8mp-ldb";
+            clocks = <&clk IMX8MP_CLK_MEDIA_LDB>;
+            clock-names = "ldb";
+
+            ports {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                port at 0 {
+                    reg = <0>;
+
+                    ldb_from_lcdif2: endpoint {
+                        remote-endpoint = <&lcdif2_to_ldb>;
+                    };
+                };
+
+                port at 1 {
+                    reg = <1>;
+
+                    ldb_lvds_ch0: endpoint {
+                        remote-endpoint = <&ldb_to_lvdsx4panel>;
+                    };
+                };
+
+                port at 2 {
+                    reg = <2>;
+
+                    ldb_lvds_ch1: endpoint {
+                    };
+                };
+            };
+        };
+    };
-- 
2.35.1