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dt-bindings: usb: generic-ehci: Document power-domains property

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It is quite common for a generic EHCI block to be embedded in an SoC in
its own power domain.  Hence allow the DTS writer to describe the
controller's position in the power hierarchy, by documenting the
optional presence of a "power-domains" property.

This gets rid of "make dtbs_check" warnings like:

    arch/arm64/boot/dts/renesas/r8a774a1-hihope-rzg2m.dt.yaml: usb@ee080100: 'power-domains' does not match any of the regexes: 'pinctrl-[0-9]+'

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Geert Uytterhoeven 2020-03-26 17:38:05 +01:00 committed by Rob Herring
parent 8f3d9f3542
commit f98d7c3abc
1 changed files with 3 additions and 0 deletions
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Documentation/devicetree/bindings/usb/generic-ehci.yaml
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@ -36,6 +36,9 @@ properties:
- if a USB DRD channel: first clock should be host and second
one should be peripheral
power-domains:
maxItems: 1
big-endian:
$ref: /schemas/types.yaml#/definitions/flag
description: