On Tue, Dec 05, 2017 at 04:10:16PM +0100, Maxime Ripard wrote: > The A83T has two video pipelines in parallel that looks quite similar to > the other SoCs. > > The video planes are handled through a controller called the mixer, and the > video signal is then passed to the timing controller (TCON). > > And while there is two instances of the mixers and TCONs, they have a > significant number of differences. The TCONs are quite easy to deal with, > one is supposed to generate TV (in the broader term, so including things > like HDMI) signals, the other one LCD (so RGB, LVDS, DSI) signals. And > while they are called TCON0 and TCON1 in the A83t datasheet, newer SoCs > call them TCON-TV and TCON-LCD, which seems more appropriate. > > However, the mixers differ mostly by their capabilities, with some features > being available only in the first one, or the number of planes they expose, > but also through their register layout. And while the capabilities could be > represented as properties, the register layout differences would need to > express all the registers offsets as properties, which is usually quite > bad. Especially since documentation on that hardware block is close to > non-existant and we don't even have the list of all those registers in the > first place. > > So let's call them mixer 0 and 1 in our compatibles, even though the name > is pretty bad... > > At the moment, we only have tested the code on a board that has a single > display output, so we're leaving the tcon-tv and mixer1 out. > > Signed-off-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx> > --- > Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt | 3 +++ > 1 file changed, 3 insertions(+) Reviewed-by: Rob Herring <robh@xxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
