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+renesas@ideasonboard.com Reviewed-by: Jacopo Mondi jacopo+renesas@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.