On Sun, Aug 01, 2021 at 02:28:47PM +0200, Stefan Wahren wrote:

The Raspberry Pi boards with BCM283x needs control of the power domains
to get display components running. So add this as an optional property
in order to avoid such DT schema warnings:

hdmi@7e902000: 'power-domains' does not match any of the regexes: ...

You're adding it because it is in use but failed to be documented, not 
to avoid warnings. The warning is just the symptom of that.

Signed-off-by: Stefan Wahren <redacted>
---
 Documentation/devicetree/bindings/display/brcm,bcm2835-dsi0.yaml | 3 +++
 Documentation/devicetree/bindings/display/brcm,bcm2835-hdmi.yaml | 3 +++
 Documentation/devicetree/bindings/display/brcm,bcm2835-v3d.yaml  | 3 +++
 Documentation/devicetree/bindings/display/brcm,bcm2835-vec.yaml  | 3 +++
 4 files changed, 12 insertions(+)

In any case,

Acked-by: Rob Herring <robh@kernel.org>