On Sunday 18 Sep 2016 13:01:16 Laurent Pinchart wrote: > On Thursday 08 Sep 2016 14:17:48 Maxime Ripard wrote: > > Some boards have an entirely passive RGB to VGA bridge, based on either > > DACs or 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 <robh@xxxxxxxxxx> > > Signed-off-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx> > > --- > > > > .../bindings/display/bridge/rgb-to-vga-bridge.txt | 52 +++++ > > drivers/gpu/drm/bridge/Kconfig | 6 + > > drivers/gpu/drm/bridge/Makefile | 1 + > > drivers/gpu/drm/bridge/rgb-to-vga.c | 232 ++++++++++++++++ > > 4 files changed, 291 insertions(+) > > create mode 100644 > > > > Documentation/devicetree/bindings/display/bridge/rgb-to-vga-bridge.txt > > create mode 100644 drivers/gpu/drm/bridge/rgb-to-vga.c > > > > diff --git > > a/Documentation/devicetree/bindings/display/bridge/rgb-to-vga-bridge.txt > > b/Documentation/devicetree/bindings/display/bridge/rgb-to-vga-bridge.txt > > new file mode 100644 > > index 000000000000..83a053fb51a0 > > --- /dev/null > > +++ > > b/Documentation/devicetree/bindings/display/bridge/rgb-to-vga-bridge.txt > > @@ -0,0 +1,52 @@ > > +Passive RGB to VGA bridge > > +------------------------- > > + > > +This binding is aimed for entirely passive RGB to VGA bridges that do not > > +require any configuration. > > Couldn't it also support active RGB to VGA bridges that don't require any > configuration ? It would seem a bit pointless to define a separate DT > binding for them. I'm thinking in particular about the ADV7123 (http://www.analog.com/media/en/technical-documentation/data-sheets/ADV7123.pdf) that already has a DT binding. Would it be feasible to combine the two, and support both devices with a single driver ? > > +Required properties: > > + > > +- compatible: Must be "rgb-to-vga-bridge" > > + > > +Required nodes: > > + > > +This device has two video ports. Their connections are modeled 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 = "rgb-to-vga-bridge"; > > + #address-cells = <1>; > > + #size-cells = <0>; > > + > > + ports { > > + #address-cells = <1>; > > + #size-cells = <0>; > > + > > + port@0 { > > + #address-cells = <1>; > > + #size-cells = <0>; > > + reg = <0>; > > + > > + vga_bridge_in: endpoint { > > + remote-endpoint = <&tcon0_out_vga>; > > + }; > > + }; > > + > > + port@1 { > > + #address-cells = <1>; > > + #size-cells = <0>; > > + reg = <1>; > > + > > + vga_bridge_out: endpoint { > > + remote-endpoint = <&vga_con_in>; > > + }; > > + }; > > + }; > > +}; -- Regards, Laurent Pinchart _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
