Commit 4d895de3 authored by Lucas Stach's avatar Lucas Stach Committed by Ulf Hansson
Browse files

dt-bindings: mmc: add no-mmc-hs400 flag 



HS400 requires a data strobe line in addition to the usual MMC signal
lines. If a board design neglects to wire up this signal, HS400 mode is
not available, even if both the controller and the eMMC are claiming to
support this mode. Add a DT flag to allow boards to disable the HS400
support in this case.

Signed-off-by: default avatarLucas Stach <dev@lynxeye.de>
Acked-by: default avatarRob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210510190400.105162-1-l.stach@pengutronix.de


Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 130206a6

Documentation/devicetree/bindings/mmc/mmc-controller.yaml

+5 −0
Original line number Diff line number Diff line
@@ -220,6 +220,11 @@ properties: 
    description:

      eMMC HS400 enhanced strobe mode is supported



  no-mmc-hs400:

    $ref: /schemas/types.yaml#/definitions/flag

    description:

      All eMMC HS400 modes are not supported.



  dsr:

    description:

      Value the card Driver Stage Register (DSR) should be programmed