On Mon, May 17, 2021 at 10:09 PM Douglas Anderson <dianders@xxxxxxxxxxxx> wrote: > Historically "simple" eDP panels have been handled by panel-simple > which is a basic platform_device. In the device tree, the panel node > was at the top level and not connected to anything else. > > Let's change it so that, instead, panels can be represented as being > children of the "DP AUX bus". Essentially we're saying that the > hierarchy that we're going to represent is the "control" connections > between devices. The DP AUX bus is a control bus provided by an eDP > controller (the parent) and consumed by a device like a panel (the > child). > > The primary incentive here is to cleanly provide the panel driver the > ability to communicate over the AUX bus while handling lifetime issues > properly. The panel driver may want the AUX bus for controlling the > backlight or querying the panel's EDID. > > The idea for this bus's design was hashed out over IRC [1]. > > [1] https://people.freedesktop.org/~cbrill/dri-log/?channel=dri-devel&date=2021-05-11 > > Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> > Cc: Lyude Paul <lyude@xxxxxxxxxx> > Cc: Rajeev Nandan <rajeevny@xxxxxxxxxxxxxx> > Suggested-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> > Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx> I like the concept and the general idea behind this, clean and helpful design. Acked-by: Linus Walleij <linus.walleij@xxxxxxxxxx> Yours, Linus Walleij
