On Thu, Dec 7, 2017 at 5:59 AM, Rob Herring <robh@xxxxxxxxxx> wrote: > 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> Reviewed-by: Chen-Yu Tsai <wens@xxxxxxxx> -- 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
