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