David Venhoff
cfcea9ee67
Based off b80915eb99
and compacted into a single commit so that it will fit on the uni git server
92 lines
2.2 KiB
Plaintext
92 lines
2.2 KiB
Plaintext
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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