92 lines
2.2 KiB
Plaintext
92 lines
2.2 KiB
Plaintext
|
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 */
|
||
|
|
};
|
||
|
|
};
|
||
|
|
};
|
||
|
|
};
|
||
|
|
};
|