Some video bridges will not have GPIOs to control reset, etc. Allow these
to be optional.

Signed-off-by: Simon Glass <sjg@chromium.org>

This chip provides an eDP to LVDS bridge which is useful for SoCs that don't
support LVDS displays (or it would waste scarce pins). There is no setup
required by this chip, other than to adjust power-down and reset pins, and
those are managed by the uclass.

Signed-off-by: Simon Glass <sjg@chromium.org>

This chip provides an eDP to LVDS bridge which is useful for SoCs that don't
support LVDS displays (or it would waste scarce pins). The setup is included
in the device tree.

Signed-off-by: Simon Glass <sjg@chromium.org>

We haven't quite got pinctrl ready to apply to mainline. We don't want to
GPIO pull-up/down support to the driver model GPIO layer either. So work
around this for now.

We can address this when pinctrl is complete.

Signed-off-by: Simon Glass <sjg@chromium.org>

A video bridge typically converts video from one format to another, e.g.
DisplayPort to LVDS. Add driver model support for these with a simple
interface to control activation and backlight. The uclass supports GPIO
control of power and reset lines.

Signed-off-by: Simon Glass <sjg@chromium.org>