FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/display/bridge/megachips-stdpxxxx-ge-b850v3-fw.txt

     Drivers for the second video output of the GE B850v3:
        STDP4028-ge-b850v3-fw bridges (LVDS-DP)
        STDP2690-ge-b850v3-fw bridges (DP-DP++)
     
     The video processing pipeline on the second output on the GE B850v3:
     
        Host -> LVDS|--(STDP4028)--|DP -> DP|--(STDP2690)--|DP++ -> Video output
     
     Each bridge has a dedicated flash containing firmware for supporting the custom
    design. The result is that, in this design, neither the STDP4028 nor the
    STDP2690 behave as the stock bridges would. The compatible strings include the
    suffix "-ge-b850v3-fw" to make it clear that the driver is for the bridges with
    the firmware specific for the GE B850v3.
    
    The hardware do not provide control over the video processing pipeline, as the
    two bridges behaves as a single one. The only interfaces exposed by the
    hardware are EDID, HPD, and interrupts.
    
    stdp4028-ge-b850v3-fw required properties:
      - compatible : "megachips,stdp4028-ge-b850v3-fw"
      - reg : I2C bus address
      - interrupts : one interrupt should be described here, as in
        <0 IRQ_TYPE_LEVEL_HIGH>
      - ports : One input port(reg = <0>) and one output port(reg = <1>)
    
    stdp2690-ge-b850v3-fw required properties:
        compatible : "megachips,stdp2690-ge-b850v3-fw"
      - reg : I2C bus address
      - ports : One input port(reg = <0>) and one output port(reg = <1>)
    
    Example:
    
    &mux2_i2c2 {
            clock-frequency = <100000>;
    
            stdp4028@73 {
                    compatible = "megachips,stdp4028-ge-b850v3-fw";
                    #address-cells = <1>;
                    #size-cells = <0>;
    
                    reg = <0x73>;
    
                    interrupt-parent = <&gpio2>;
                    interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
    
                    ports {
                            #address-cells = <1>;
                            #size-cells = <0>;
    
                            port@0 {
                                    reg = <0>;
                                    stdp4028_in: endpoint {
                                            remote-endpoint = <&lvds0_out>;
                                    };
                            };
                            port@1 {
                                    reg = <1>;
                                    stdp4028_out: endpoint {
                                            remote-endpoint = <&stdp2690_in>;
                                    };
                            };
                    };
            };
    
            stdp2690@72 {
                    compatible = "megachips,stdp2690-ge-b850v3-fw";
                    #address-cells = <1>;
                    #size-cells = <0>;
    
                    reg = <0x72>;
    
                    ports {
                            #address-cells = <1>;
                            #size-cells = <0>;
    
                            port@0 {
                                    reg = <0>;
                                    stdp2690_in: endpoint {
                                            remote-endpoint = <&stdp4028_out>;
                                    };
                            };
    
                            port@1 {
                                    reg = <1>;
                                    stdp2690_out: endpoint {
                                            /* Connector for external display */
                                    };
                            };
                    };
            };
    };

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