Re: [PATCH 1/2] dt-bindings: usb: snps,dwc3: Allow power-domains property

From: Felipe Balbi <balbi@kernel.org>
To: Rob Herring <robh@kernel.org>
Cc: Heiko Stuebner <heiko@sntech.de>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Thinh Nguyen <Thinh.Nguyen@synopsys.com>,
	linux-rockchip@lists.infradead.org,
	Johan Jonker <jbx6244@gmail.com>,
	linux-arm-kernel@lists.infradead.org, linux-usb@vger.kernel.org,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: usb: snps,dwc3: Allow power-domains property
Date: Fri, 23 Dec 2022 12:31:01 +0200	[thread overview]
Message-ID: <878riy9ztm.fsf@balbi.sh> (raw)
In-Reply-To: <CAL_JsqKgGWN93QJ=V34=X3hC2bgdcd3vwO0Mne-8z8HOfVDz-g@mail.gmail.com>

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Hi,

Rob Herring <robh@kernel.org> writes:
>> > The Rockchip RK3399 DWC3 node has 'power-domain' property which isn't
>> > allowed by the schema:
>> >
>> > usb@fe900000: Unevaluated properties are not allowed ('power-domains' was unexpected)
>> >
>> > Allow DWC3 nodes to have a single power-domains entry. We could instead
>> > move the power-domains property to the parent wrapper node, but the
>> > could be an ABI break (Linux shouldn't care). Also, we don't want to
>> > encourage the pattern of wrapper nodes just to define resources such as
>> > clocks, resets, power-domains, etc. when not necessary.
>> >
>> > Signed-off-by: Rob Herring <robh@kernel.org>
>> > ---
>> >  Documentation/devicetree/bindings/usb/snps,dwc3.yaml | 3 +++
>> >  1 file changed, 3 insertions(+)
>> >
>> > diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
>> > index 6d78048c4613..bcefd1c2410a 100644
>> > --- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
>> > +++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
>> > @@ -91,6 +91,9 @@ properties:
>> >          - usb2-phy
>> >          - usb3-phy
>> >
>> > +  power-domains:
>> > +    maxItems: 1
>>
>> AFAICT this can be incorrect. Also, you could have Cc the dwc3
>> maintainer to get comments.
>
> When we have a user with more and know what each one is, then we can
> extend it. All the other users (upstream), put 'power-domains' in the

Won't that be an ABI break at that point? You'll change the maximum
number of power-domains.

> wrapper node. But this is what we need now for RK3399.
>
> I used get_maintainers.pl. If that's the wrong output, fix it please.

@Thinh, perhaps you should add dwc3 binding file to the list of
maintained files for you?

-- 
balbi

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