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drm/bridge: Add RGB to VGA bridge support

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Some boards have an entirely passive RGB to VGA bridge, based on DACs
implemented by resistor ladders.

Those might or might not have an i2c bus routed to the VGA connector in
order to access the screen EDIDs.

Add a bridge that doesn't do anything but expose the modes available on the
screen, either based on the EDIDs if available, or based on the XGA
standards.

Acked-by: Rob Herring <[email protected]>
Reviewed-by: Sean Paul <[email protected]>
Tested-by: Laurent Pinchart <[email protected]>
Signed-off-by: Maxime Ripard <[email protected]>
Signed-off-by: Archit Taneja <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
This commit is contained in:
Maxime Ripard 2016-09-30 16:37:06 +02:00 • committed by Archit Taneja
commit 56fe8b6f49
4 changed files with 279 additions and 0 deletions
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48
Documentation/devicetree/bindings/display/bridge/dumb-vga-dac.txt Normal file
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Dumb RGB to VGA DAC bridge
---------------------------
This binding is aimed for dumb RGB to VGA DAC based bridges that do not require
any configuration.
Required properties:
- compatible: Must be "dumb-vga-dac"
Required nodes:
This device has two video ports. Their connections are modelled using the OF
graph bindings specified in Documentation/devicetree/bindings/graph.txt.
- Video port 0 for RGB input
- Video port 1 for VGA output
Example
-------
bridge {
compatible = "dumb-vga-dac";
#address-cells = <1>;
#size-cells = <0>;
ports {
#address-cells = <1>;
#size-cells = <0>;
port@0 {
reg = <0>;
vga_bridge_in: endpoint {
remote-endpoint = <&tcon0_out_vga>;
};
};
port@1 {
reg = <1>;
vga_bridge_out: endpoint {
remote-endpoint = <&vga_con_in>;
};
};
};
};