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

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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: Lucas Stach <dev@lynxeye.de>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210510190400.105162-1-l.stach@pengutronix.de
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Lucas Stach 2021-05-10 21:03:58 +02:00 committed by Ulf Hansson
parent 130206a615
commit 4d895de350
1 changed files with 5 additions and 0 deletions
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5
Documentation/devicetree/bindings/mmc/mmc-controller.yaml
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@ -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