Commit 359ed24a authored by Fei Shao's avatar Fei Shao Committed by Jiri Kosina
Browse files

dt-bindings: input: goodix: Add "goodix,no-reset-during-suspend" property 



We observed that on Chromebook device Steelix, if Goodix GT7375P
touchscreen is powered in suspend (because, for example, it connects to
an always-on regulator) and with the reset GPIO asserted, it will
introduce about 14mW power leakage.

To address that, we add this property to skip reset during suspend.
If it's set, the driver will stop asserting the reset GPIO during
power-down. Refer to the comments in the driver for details.

Signed-off-by: default avatarFei Shao <fshao@chromium.org>
Suggested-by: default avatarJeff LaBundy <jeff@labundy.com>
Reviewed-by: default avatarDouglas Anderson <dianders@chromium.org>
Reviewed-by: default avatarMatthias Brugger <matthias.bgg@gmail.com>
Reviewed-by: default avatarJeff LaBundy <jeff@labundy.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent fa56e0e4

Documentation/devicetree/bindings/input/goodix,gt7375p.yaml

+9 −0
Original line number Diff line number Diff line
@@ -43,6 +43,15 @@ properties: 
      itself as long as it allows the main board to make signals compatible

      with what the touchscreen is expecting for its IO rails.



  goodix,no-reset-during-suspend:

    description:

      Set this to true to enforce the driver to not assert the reset GPIO

      during suspend.

      Due to potential touchscreen hardware flaw, back-powering could happen in

      suspend if the power supply is on and with active-low reset GPIO asserted.

      This property is used to avoid the back-powering issue.

    type: boolean



required:

  - compatible

  - reg