Hi Geert, On Sun, May 12, 2019 at 10:58:54AM +0200, Geert Uytterhoeven wrote: > On Sat, May 11, 2019 at 11:07 PM Laurent Pinchart wrote: > > The THC63LVD1024 LVDS decoder can operate in two modes, single-link or > > dual-link. In dual-link mode both input ports are used to carry even- > > and odd-numbered pixels separately. Document this in the DT bindings, > > along with the related rules governing port and usage. > > > > Signed-off-by: Laurent Pinchart <laurent.pinchart+rene...@ideasonboard.com> > > Reviewed-by: Jacopo Mondi <jacopo+rene...@jmondi.org> > > --- > > .../bindings/display/bridge/thine,thc63lvd1024.txt | 6 ++++++ > > 1 file changed, 6 insertions(+) > > > > diff --git > > a/Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.txt > > b/Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.txt > > index 37f0c04d5a28..d17d1e5820d7 100644 > > --- > > a/Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.txt > > +++ > > b/Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.txt > > @@ -28,6 +28,12 @@ Optional video port nodes: > > - port@1: Second LVDS input port > > - port@3: Second digital CMOS/TTL parallel output > > > > +The device can operate in single-link mode or dual-link mode. In > > single-link > > +mode, all pixels are received on port@0, and port@1 shall not contain any > > +endpoint. In dual-link mode, even-numbered pixels are received on port@0 > > and > > +odd-numbered pixels on port@1, and both port@0 and port@1 shall contain > > +endpoints. > > This describes single/dual input. > Does single/dual output need to be described, too?
Jacopo asked the same question on v1 :-) Dual-output should be described as well, but as I have no hardware setup where to test that, I decided to leave it out of the DT bindings to start with, as it's generally a bad idea to specify untested DT bindings (as in having no end-to-end implementation). I don't think it will be a big deal though, there is already a port for the second output, it should just be a matter of connecting it. > BTW, I see the second input/output set is optional, wile the first set > is required. Could it happen the hardware is wired for the second > set only? Not to my knowledge. In dual-in, dual-out the two input/output pairs are not independent, the two inputs are used together to create a higher bandwidth link, and the odd- and even-pixels are then sent to separate routes. -- Regards, Laurent Pinchart
