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dt-bindings: mmc: Add small binding note on level shifters 

The VQMMC is often provided by a level shifter, so drop a small note
in the bindings that this can be the case and how that is done.
It is helpful information since this is pretty common.

Cc: devicetree@vger.kernel.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20220417144223.649201-1-linus.walleij@linaro.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Linus Walleij 2022-04-17 16:42:23 +02:00 committed by Ulf Hansson
parent f7ad75041b
commit de6e855b28
1 changed files with 4 additions and 1 deletions
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5
Documentation/devicetree/bindings/mmc/mmc-controller.yaml
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@ -298,7 +298,10 @@ properties:
vqmmc-supply:
description:
Supply for the bus IO line power
Supply for the bus IO line power, such as a level shifter.
If the level shifter is controlled by a GPIO line, this shall
be modeled as a "regulator-fixed" with a GPIO line for
switching the level shifter on/off.
mmc-pwrseq:
$ref: /schemas/types.yaml#/definitions/phandle