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dt-bindings: display: Add hpd-gpios to panel-common bindings 

In the cases where there is no connector in a system there's no great
place to put "hpd-gpios".  As per discussion [1] the best place to put
it is in the panel.  Add this to the device tree bindings.

[1] https://lore.kernel.org/r/20200417180819.GE5861@pendragon.ideasonboard.com

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200507143354.v5.2.I1976736b400a3b30e46efa47782248b86b3bc627@changeid
This commit is contained in:
Douglas Anderson 2020-05-07 14:34:56 -07:00 committed by Sam Ravnborg
parent cfe40d0223
commit d252830652
1 changed files with 6 additions and 0 deletions
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6
Documentation/devicetree/bindings/display/panel/panel-common.yaml
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@ -96,6 +96,12 @@ properties:
(hot plug detect) signal, but the signal isn't hooked up so we should (hot plug detect) signal, but the signal isn't hooked up so we should
hardcode the max delay from the panel spec when powering up the panel. hardcode the max delay from the panel spec when powering up the panel.
hpd-gpios:
maxItems: 1
description:
If Hot Plug Detect (HPD) is connected to a GPIO in the system rather
than a dedicated HPD pin the pin can be specified here.
# Control I/Os # Control I/Os
# Many display panels can be controlled through pins driven by GPIOs. The nature # Many display panels can be controlled through pins driven by GPIOs. The nature