[PATCH v3 4/9] dt-bindings: display/bridge: add binding for TH1520 HDMI controller

Icenowy Zheng
2025-11-24T10:53:54Z

T-Head TH1520 SoC contains a Synopsys DesignWare HDMI controller paired
with DesignWare HDMI PHY, with an extra clock gate for HDMI pixel clock
and two reset controls.

Add a device tree binding to it.

Signed-off-by: Icenowy Zheng <uwu@icenowy.me>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
---
No changes in v3.

Changes in v2:
- Re-aligned multi-line clocks/resets in example.
- Added Krzysztof's R-b.

.../display/bridge/thead,th1520-dw-hdmi.yaml | 120 ++++++++++++++++++
1 file changed, 120 insertions(+)
create mode 100644 Documentation/devicetree/bindings/display/bridge/thead,th1520-dw-hdmi.yaml

diff --git a/Documentation/devicetree/bindings/display/bridge/thead,th1520-dw-hdmi.yaml b/Documentation/devicetree/bindings/display/bridge/thead,th1520-dw-hdmi.yaml
new file mode 100644
index 0000000000000..68fff885ce15b
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/bridge/thead,th1520-dw-hdmi.yaml
@@ -0,0 +1,120 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/bridge/thead,th1520-dw-hdmi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: T-Head TH1520 DesignWare HDMI TX Encoder
+
+maintainers:
+ - Icenowy Zheng <uwu@icenowy.me>
+
+description:
+ The HDMI transmitter is a Synopsys DesignWare HDMI TX controller
+ paired with a DesignWare HDMI Gen2 TX PHY.
+
+allOf:
+ - $ref: /schemas/display/bridge/synopsys,dw-hdmi.yaml#
+
+properties:
+ compatible:
+ enum:
+ - thead,th1520-dw-hdmi
+
+ reg-io-width:
+ const: 4
+
+ clocks:
+ maxItems: 4
+
+ clock-names:
+ items:
+ - const: iahb
+ - const: isfr
+ - const: cec
+ - const: pix
+
+ resets:
+ items:
+ - description: Main reset
+ - description: Configuration APB reset
+
+ reset-names:
+ items:
+ - const: main
+ - const: apb
+
+ ports:
+ $ref: /schemas/graph.yaml#/properties/ports
+
+ properties:
+ port@0:
+ $ref: /schemas/graph.yaml#/properties/port
+ description: Input port connected to DC8200 DPU "DP" output
+
+ port@1:
+ $ref: /schemas/graph.yaml#/properties/port
+ description: HDMI output port
+
+ required:
+ - port@0
+ - port@1
+
+required:
+ - compatible
+ - reg
+ - reg-io-width
+ - clocks
+ - clock-names
+ - resets
+ - reset-names
+ - interrupts
+ - ports
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/interrupt-controller/irq.h>
+ #include <dt-bindings/clock/thead,th1520-clk-ap.h>
+ #include <dt-bindings/reset/thead,th1520-reset.h>
+
+ soc {
+ #address-cells = <2>;
+ #size-cells = <2>;
+
+ hdmi@ffef540000 {
+ compatible = "thead,th1520-dw-hdmi";
+ reg = <0xff 0xef540000 0x0 0x40000>;
+ reg-io-width = <4>;
+ interrupts = <111 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&clk_vo CLK_HDMI_PCLK>,
+ <&clk_vo CLK_HDMI_SFR>,
+ <&clk_vo CLK_HDMI_CEC>,
+ <&clk_vo CLK_HDMI_PIXCLK>;
+ clock-names = "iahb", "isfr", "cec", "pix";
+ resets = <&rst_vo TH1520_RESET_ID_HDMI>,
+ <&rst_vo TH1520_RESET_ID_HDMI_APB>;
+ reset-names = "main", "apb";
+
+ ports {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ port@0 {
+ reg = <0>;
+
+ hdmi_in: endpoint {
+ remote-endpoint = <&dpu_out_dp1>;
+ };
+ };
+
+ port@1 {
+ reg = <1>;
+
+ hdmi_out_conn: endpoint {
+ remote-endpoint = <&hdmi_conn_in>;
+ };
+ };
+ };
+ };
+ };
--
2.52.0