Am Freitag, den 28.02.2014, 15:59 +0000 schrieb Russell King - ARM
Linux:
> On Fri, Feb 28, 2014 at 02:20:10PM +0200, Tomi Valkeinen wrote:
> > Add DT binding documentation for DVI Connector.
> >
> > Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
> > Reviewed-by: Archit Taneja <archit@xxxxxx>
> > ---
> > .../devicetree/bindings/video/dvi-connector.txt | 26 ++++++++++++++++++++++
> > 1 file changed, 26 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/video/dvi-connector.txt
> >
> > diff --git a/Documentation/devicetree/bindings/video/dvi-connector.txt b/Documentation/devicetree/bindings/video/dvi-connector.txt
> > new file mode 100644
> > index 000000000000..6a0aff866c78
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/video/dvi-connector.txt
> > @@ -0,0 +1,26 @@
> > +DVI Connector
> > +==============
> > +
> > +Required properties:
> > +- compatible: "dvi-connector"
> > +
> > +Optional properties:
> > +- label: a symbolic name for the connector
> > +- i2c-bus: phandle to the i2c bus that is connected to DVI DDC
> > +
> > +Required nodes:
> > +- Video port for DVI input
> > +
> > +Example
> > +-------
> > +
> > +dvi0: connector@0 {
> > + compatible = "dvi-connector";
> > + label = "dvi";
> > +
> > + i2c-bus = <&i2c3>;
> > +
> > + dvi_connector_in: endpoint {
> > + remote-endpoint = <&tfp410_out>;
> > + };
> > +};
>
> This looks far too simplistic. There are different classes of DVI
> connector - there is:
>
> DVI A - analogue only
> DVI D - digital only (single and dual link)
> DVI I - both (single and dual digital link)
>
> DRM at least makes a distinction between these three classes, and this
> disctinction is part of the user API. How would a display system know
> which kind of DVI connector is wired up on the board from this DT
> description?
Maybe this could be inferred from the sources connected to it. For
example a i.MX5 board with the SoC internal TV Encoder and an external
SiI902x HDMI encoder connected to the same DVI I connector:
ipu {
port@2 {
ipu_di0_disp0: endpoint {
remote-endpoint = <&sii902x_in>;
};
};
port@3 {
ipu_di1_tve: endpoint {
remote-endpoint = <&tve_in>;
};
};
};
&sii902x {
compatible = "si,sii9022";
port@0 {
sii902x_in: endpoint {
remote-endpoint = <&ipu_di0>;
};
};
port@1 {
sii902x_out: endpoint {
remote-endpoint = <&dvi_d_in>;
};
};
};
&tve {
compatible = "fsl,imx53-tve";
port@0 {
tve_in: endpoint {
remote-endpoint = <&ipu_di1>;
};
};
port@1 {
tve_out: endpoint {
remote-endpoint = <&dvi_a_in>;
};
};
};
dvi-connector {
compatible = "dvi-connector";
ddc-i2c-bus = <&i2c3>;
port {
dvi_d_in: endpoint@0 {
remote-endpoint = <&sii902x_out>;
};
dvi_a_in: endpoint@1 {
remote-endpoint = <&tve_out>;
};
};
};
It should be possible to let the connector know that those two endpoints
are connected to a TMDS source and to a VGA source, respectively.
regards
Philipp
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