linux-kernel - Re: [PATCH v6 2/9] dt-bindings: soc: imx-blk-ctrl: add i.MX91 blk-ctrl compatible

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Message-ID: <aFq7WJ3Fqe9p0EhA@lizhi-Precision-Tower-5810>
Date: Tue, 24 Jun 2025 10:51:04 -0400
From: Frank Li <Frank.li@....com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Joy Zou <joy.zou@....com>, robh@...nel.org, krzk+dt@...nel.org,
	conor+dt@...nel.org, shawnguo@...nel.org, s.hauer@...gutronix.de,
	catalin.marinas@....com, will@...nel.org, andrew+netdev@...n.ch,
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, mcoquelin.stm32@...il.com,
	alexandre.torgue@...s.st.com, ulf.hansson@...aro.org,
	richardcochran@...il.com, kernel@...gutronix.de, festevam@...il.com,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
	linux-pm@...r.kernel.or, ye.li@....com, ping.bai@....com,
	aisheng.dong@....com
Subject: Re: [PATCH v6 2/9] dt-bindings: soc: imx-blk-ctrl: add i.MX91
 blk-ctrl compatible

On Tue, Jun 24, 2025 at 09:28:43AM +0200, Krzysztof Kozlowski wrote:
> On Mon, Jun 23, 2025 at 05:57:25PM +0800, Joy Zou wrote:
> > Add new compatible string "fsl,imx91-media-blk-ctrl" for i.MX91,
> > which has different input clocks compared to i.MX93. Update the
> > clock-names list and handle it in the if-else branch accordingly.
> >
> > Keep the same restriction for the existed compatible strings.
> >
> > Signed-off-by: Joy Zou <joy.zou@....com>
> > ---
> > Changes for v5:
> > 1. modify the imx93-blk-ctrl binding for imx91 support.
>
> This is just vague. Anything can be "modify". Why are you doing this?
> What are you doing here?
>
> > ---
> >  .../soc/imx/fsl,imx93-media-blk-ctrl.yaml     | 55 +++++++++++++++----
> >  1 file changed, 43 insertions(+), 12 deletions(-)
> >
> > diff --git a/Documentation/devicetree/bindings/soc/imx/fsl,imx93-media-blk-ctrl.yaml b/Documentation/devicetree/bindings/soc/imx/fsl,imx93-media-blk-ctrl.yaml
> > index b3554e7f9e76..db5ee65f8eb8 100644
> > --- a/Documentation/devicetree/bindings/soc/imx/fsl,imx93-media-blk-ctrl.yaml
> > +++ b/Documentation/devicetree/bindings/soc/imx/fsl,imx93-media-blk-ctrl.yaml
> > @@ -18,7 +18,9 @@ description:
> >  properties:
> >    compatible:
> >      items:
> > -      - const: fsl,imx93-media-blk-ctrl
> > +      - enum:
> > +          - fsl,imx91-media-blk-ctrl
> > +          - fsl,imx93-media-blk-ctrl
> >        - const: syscon
> >
> >    reg:
> > @@ -31,21 +33,50 @@ properties:
> >      maxItems: 1
> >
> >    clocks:
> > +    minItems: 8
> >      maxItems: 10
> >
> >    clock-names:
> > -    items:
> > -      - const: apb
> > -      - const: axi
> > -      - const: nic
> > -      - const: disp
> > -      - const: cam
> > -      - const: pxp
> > -      - const: lcdif
> > -      - const: isi
> > -      - const: csi
> > -      - const: dsi
> > +    minItems: 8
> > +    maxItems: 10
> >
> > +allOf:
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            const: fsl,imx93-media-blk-ctrl
> > +    then:
> > +      properties:
>
> Missing constraints for clocks
>
> > +        clock-names:
> > +          items:
> > +            - const: apb
> > +            - const: axi
> > +            - const: nic
> > +            - const: disp
> > +            - const: cam
> > +            - const: pxp
> > +            - const: lcdif
> > +            - const: isi
> > +            - const: csi
> > +            - const: dsi
>
> Keep list in comon part.
>
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            const: fsl,imx91-media-blk-ctrl
>
> This should be before if: for imx93. 91 < 93
>
> > +    then:
> > +      properties:
>
> Why imx91 now has 10 clocks?
>
> v6 and this has basic issues. The quality of NXP patches decreases :/
>
> > +        clock-names:
> > +          items:
> > +            - const: apb
> > +            - const: axi
> > +            - const: nic
> > +            - const: disp
> > +            - const: cam
> > +            - const: lcdif
> > +            - const: isi
> > +            - const: csi
>
> No, look at other bindings how they share clock lists.

Sorry, this method is what I suggested. becuase there are pxp between cam
and lcdif, can't use simple minItems/maxItems to limit list.

If put two lists at top, clock-names list have to dupliate at both top and
if-else branch.

If there are better solution, please point me which file have good method
to share two totally difference list.

Frank


>
> Best regards,
> Krzysztof
>