From: Nicolas Boichat <drinkcat@xxxxxxxxxxxx> Add bindings for Generic GPIO mux driver. Signed-off-by: Nicolas Boichat <drinkcat@xxxxxxxxxxxx> Signed-off-by: Pin-yen Lin <treapking@xxxxxxxxxxxx> --- Rob mentioned that this series can probably use the common MUX bindings. Those bindings are designed for MUX consumers that requests a certain MUX configuration, while this driver is reading a GPIO pin controlled by the other parts of the system (in our use case, it's the embedded controller firmware). Changes in v3: - Removed ddc-i2c-bus in the bindings Changes in v2: - Referenced existing dt-binding schemas from graph.yaml - Added ddc-i2c-bus into the bindings .../bindings/display/bridge/gpio-mux.yaml | 90 +++++++++++++++++++ 1 file changed, 90 insertions(+) create mode 100644 Documentation/devicetree/bindings/display/bridge/gpio-mux.yaml diff --git a/Documentation/devicetree/bindings/display/bridge/gpio-mux.yaml b/Documentation/devicetree/bindings/display/bridge/gpio-mux.yaml new file mode 100644 index 000000000000..e6b82ea2f45c --- /dev/null +++ b/Documentation/devicetree/bindings/display/bridge/gpio-mux.yaml @@ -0,0 +1,90 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/display/bridge/gpio-mux.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Generic display mux (1 input, 2 outputs) + +maintainers: + - Nicolas Boichat <drinkcat@xxxxxxxxxxxx> + +description: | + This bindings describes a simple display (e.g. HDMI) mux, that has 1 + input, and 2 outputs. The mux status is controlled by hardware, and + its status is read back using a GPIO. + +properties: + compatible: + const: gpio-display-mux + + detect-gpios: + maxItems: 1 + description: GPIO that indicates the active output + + ports: + $ref: /schemas/graph.yaml#/properties/ports + + properties: + port@0: + $ref: /schemas/graph.yaml#/properties/port + description: | + Video port for input. + + port@1: + $ref: /schemas/graph.yaml#/properties/port + description: | + 2 video ports for output. + The reg value in the endpoints matches the GPIO status: when + GPIO is asserted, endpoint with reg value <1> is selected. + + required: + - port@0 + - port@1 + +required: + - compatible + - detect-gpios + - ports + +unevaluatedProperties: false + +examples: + - | + #include <dt-bindings/gpio/gpio.h> + hdmi_mux: hdmi_mux { + compatible = "gpio-display-mux"; + detect-gpios = <&pio 36 GPIO_ACTIVE_HIGH>; + pinctrl-names = "default"; + pinctrl-0 = <&hdmi_mux_pins>; + + ports { + #address-cells = <1>; + #size-cells = <0>; + + port@0 { /* input */ + reg = <0>; + + hdmi_mux_in: endpoint { + remote-endpoint = <&hdmi0_out>; + }; + }; + + port@1 { /* output */ + reg = <1>; + + #address-cells = <1>; + #size-cells = <0>; + + hdmi_mux_out_anx: endpoint@0 { + reg = <0>; + remote-endpoint = <&dp_bridge_in>; + }; + + hdmi_mux_out_hdmi: endpoint@1 { + reg = <1>; + remote-endpoint = <&hdmi_connector_in>; + }; + }; + }; + }; -- 2.39.2.637.g21b0678d19-goog
