FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/display/arm,hdlcd.txt

     ARM HDLCD
     
     This is a display controller found on several development platforms produced
     by ARM Ltd and in more modern of its' Fast Models. The HDLCD is an RGB
     streamer that reads the data from a framebuffer and sends it to a single
     digital encoder (DVI or HDMI).
     
     Required properties:
       - compatible: "arm,hdlcd"
      - reg: Physical base address and length of the controller's registers.
      - interrupts: One interrupt used by the display controller to notify the
        interrupt controller when any of the interrupt sources programmed in
        the interrupt mask register have activated.
      - clocks: A list of phandle + clock-specifier pairs, one for each
        entry in 'clock-names'.
      - clock-names: A list of clock names. For HDLCD it should contain:
          - "pxlclk" for the clock feeding the output PLL of the controller.
    
    Required sub-nodes:
      - port: The HDLCD connection to an encoder chip. The connection is modeled
        using the OF graph bindings specified in
        Documentation/devicetree/bindings/graph.txt.
    
    Optional properties:
      - memory-region: phandle to a node describing memory (see
        Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt) to be
        used for the framebuffer; if not present, the framebuffer may be located
        anywhere in memory.
    
    
    Example:
    
    / {
            ...
    
            hdlcd@2b000000 {
                    compatible = "arm,hdlcd";
                    reg = <0 0x2b000000 0 0x1000>;
                    interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
                    clocks = <&oscclk5>;
                    clock-names = "pxlclk";
                    port {
                            hdlcd_output: endpoint@0 {
                                    remote-endpoint = <&hdmi_enc_input>;
                            };
                    };
            };
    
            /* HDMI encoder on I2C bus */
            i2c@7ffa0000 {
                    ....
                    hdmi-transmitter@70 {
                            compatible = ".....";
                            reg = <0x70>;
                            port@0 {
                                    hdmi_enc_input: endpoint {
                                            remote-endpoint = <&hdlcd_output>;
                                    };
    
                                    hdmi_enc_output: endpoint {
                                            remote-endpoint = <&hdmi_1_port>;
                                    };
                            };
                    };
    
            };
    
            hdmi1: connector@1 {
                    compatible = "hdmi-connector";
                    type = "a";
                    port {
                            hdmi_1_port: endpoint {
                                    remote-endpoint = <&hdmi_enc_output>;
                            };
                    };
            };
    
            ...
    };

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