dt-bindings: display: renesas: Add R-Car Gen3 HDMI TX DT bindings

The Renesas R-Car Gen3 SoCs use a Synopsys DWC HDMI TX encoder IP. Add
corresponding device tree bindings based on the DWC HDMI TX bindings
model.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Rob Herring <robh@kernel.org>

2 files changed, 76 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/display/bridge/renesas,dw-hdmi.txt b/Documentation/devicetree/bindings/display/bridge/renesas,dw-hdmi.txt
new file mode 100644
index 000000000000..f6b3f36d422b
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/bridge/renesas,dw-hdmi.txt
@@ -0,0 +1,75 @@
+Renesas Gen3 DWC HDMI TX Encoder
+================================
+
+The HDMI transmitter is a Synopsys DesignWare HDMI 1.4 TX controller IP
+with a companion PHY IP.
+
+These DT bindings follow the Synopsys DWC HDMI TX bindings defined in
+Documentation/devicetree/bindings/display/bridge/dw_hdmi.txt with the
+following device-specific properties.
+
+
+Required properties:
+
+- compatible : Shall contain one or more of
+  - "renesas,r8a7795-hdmi" for R8A7795 (R-Car H3) compatible HDMI TX
+  - "renesas,rcar-gen3-hdmi" for the generic R-Car Gen3 compatible HDMI TX
+
+    When compatible with generic versions, nodes must list the SoC-specific
+    version corresponding to the platform first, followed by the
+    family-specific version.
+
+- reg: See dw_hdmi.txt.
+- interrupts: HDMI interrupt number
+- clocks: See dw_hdmi.txt.
+- clock-names: Shall contain "iahb" and "isfr" as defined in dw_hdmi.txt.
+- ports: See dw_hdmi.txt. The DWC HDMI shall have one port numbered 0
+  corresponding to the video input of the controller and one port numbered 1
+  corresponding to its HDMI output. Each port shall have a single endpoint.
+
+Optional properties:
+
+- power-domains: Shall reference the power domain that contains the DWC HDMI,
+  if any.
+
+
+Example:
+
+        hdmi0: hdmi0@fead0000 {
+                compatible = "renesas,r8a7795-dw-hdmi";
+                reg = <0 0xfead0000 0 0x10000>;
+                interrupts = <0 389 IRQ_TYPE_LEVEL_HIGH>;
+                clocks = <&cpg CPG_CORE R8A7795_CLK_S0D4>, <&cpg CPG_MOD 729>;
+                clock-names = "iahb", "isfr";
+                power-domains = <&sysc R8A7795_PD_ALWAYS_ON>;
+                status = "disabled";
+
+                ports {
+                        #address-cells = <1>;
+                        #size-cells = <0>;
+                        port@0 {
+                                reg = <0>;
+                                dw_hdmi0_in: endpoint {
+                                        remote-endpoint = <&du_out_hdmi0>;
+                                };
+                        };
+                        port@1 {
+                                reg = <1>;
+                                rcar_dw_hdmi0_out: endpoint {
+                                        remote-endpoint = <&hdmi0_con>;
+                                };
+                        };
+                };
+        };
+
+        hdmi0-out {
+                compatible = "hdmi-connector";
+                label = "HDMI0 OUT";
+                type = "a";
+
+                port {
+                        hdmi0_con: endpoint {
+                                remote-endpoint = <&rcar_dw_hdmi0_out>;
+                        };
+                };
+        };
diff --git a/MAINTAINERS b/MAINTAINERS
index fa8479e1799a..bac1a88cdd4a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4383,6 +4383,7 @@ S:	Supported
 F:      drivers/gpu/drm/rcar-du/
 F:      drivers/gpu/drm/shmobile/
 F:      include/linux/platform_data/shmob_drm.h
+F:      Documentation/devicetree/bindings/display/bridge/renesas,dw-hdmi.txt
 F:      Documentation/devicetree/bindings/display/renesas,du.txt
 
 DRM DRIVER FOR QXL VIRTUAL GPU