dt-bindings: dp-connector: add binding for DisplayPort connector
Add binding for DisplayPort connector. A few notes:
* Similar to hdmi-connector, it has hpd-gpios as an optional property,
as the HPD could also be handled by, e.g., the DP bridge.
* dp-pwr-supply, which provides 3.3V on DP_PWR pin, is optional, as it
is not strictly required: standard DP cables do not even have the pin
connected.
* Connector type. Full size and mini connectors are identical except for
the connector size and form, so I believe there is no functional need
for this property. But similar to 'label' property, it might be used
to present information about the connector to the userspace.
* No eDP. There's really no "eDP connector", as it's always a custom
made connection between the DP and the DP panel, although the eDP spec
does offer a few suggested pin setups. So possibly there is no need for
edp-connector binding, but even if there is, I don't want to guess what
it could look like, and could it be part of the dp-connector binding.
* No DP++. I'm not familiar with DP++. DP++ might need an i2c bus added
to the bindings.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20201130112919.241054-2-tomi.valkeinen@ti.com
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