linux-kernel - Re: [PATCH] dt-bindings: mxsfb: Exclude i.MX8MQ from power-domains requirement

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Date:   Fri, 11 Aug 2023 05:47:03 +0200
From:   Marek Vasut <marex@...x.de>
To:     Conor Dooley <conor@...nel.org>,
        Guido Günther <guido.gunther@...i.sm>
Cc:     David Heidelberg <david@...t.cz>, Stefan Agner <stefan@...er.ch>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Liu Ying <victor.liu@....com>, kernel@...i.sm,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Rob Herring <robh@...nel.org>, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: mxsfb: Exclude i.MX8MQ from power-domains
 requirement

On 8/10/23 21:30, Conor Dooley wrote:
> On Wed, Aug 02, 2023 at 11:51:17AM +0200, Guido Günther wrote:
>> Hi,
>> On Sun, Jul 30, 2023 at 09:41:20PM +0300, David Heidelberg wrote:
>>> i.MX8MQ uses as secondary compatible fsl,imx6sx-lcdif, which triggers
>>> requirement of power-domains, thou it's not required.
>>>
>>> Fixes: f62678a77d58 ("dt-bindings: mxsfb: Document i.MX8M/i.MX6SX/i.MX6SL power-domains property")
>>>
>>> Signed-off-by: David Heidelberg <david@...t.cz>
>>> ---
>>>   .../devicetree/bindings/display/fsl,lcdif.yaml        | 11 +++++++++--
>>>   1 file changed, 9 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/Documentation/devicetree/bindings/display/fsl,lcdif.yaml b/Documentation/devicetree/bindings/display/fsl,lcdif.yaml
>>> index fc11ab5fc465..2d868276b0f9 100644
>>> --- a/Documentation/devicetree/bindings/display/fsl,lcdif.yaml
>>> +++ b/Documentation/devicetree/bindings/display/fsl,lcdif.yaml
>>> @@ -129,8 +129,15 @@ allOf:
>>>                 - fsl,imx8mp-lcdif
>>>                 - fsl,imx93-lcdif
>>>       then:
>>> -      required:
>>> -        - power-domains
>>> +      if:
>>> +        properties:
>>> +          compatible:
>>> +            not:
>>> +              contains:
>>> +                const: fsl,imx8mq-lcdif
>>> +      then:
>>> +        required:
>>> +          - power-domains
>>
>> We currently enable the mipi power domain for the mipi dphy and nwl
>> bridge only but not for LCDIF itself assuming it's not needed (as there's
>> other outputs LCDIF can drive). I *think* this is correct but maybe
>> Marek or Liu can confirm?
> 
> I'm happy to Ack this, but I've been sitting on it waiting to see if
> Marek or Liu popped up..

I don't see anything which would resemble power domains like on 
MX8MM/N/P on the MQ MXSFB, there are such domains for the VPU and DCSS, 
but not MXSFB. So

Reviewed-by: Marek Vasut <marex@...x.de>