linux-kernel - Re: [PATCH 1/3] media: dt-bindings: nxp,imx8-isi: Add i.MX95 ISI compatible string

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Message-ID: <aP/F3joJ0RnL0G1z@lizhi-Precision-Tower-5810>
Date: Mon, 27 Oct 2025 15:19:58 -0400
From: Frank Li <Frank.li@....com>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: Guoniu Zhou <guoniu.zhou@....nxp.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, linux-media@...r.kernel.org,
	devicetree@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Guoniu Zhou <guoniu.zhou@....com>
Subject: Re: [PATCH 1/3] media: dt-bindings: nxp,imx8-isi: Add i.MX95 ISI
 compatible string

On Mon, Oct 27, 2025 at 12:04:38AM +0200, Laurent Pinchart wrote:
> On Fri, Oct 24, 2025 at 09:34:14AM -0400, Frank Li wrote:
> > On Fri, Oct 24, 2025 at 05:46:52PM +0800, Guoniu Zhou wrote:
> > > From: Guoniu Zhou <guoniu.zhou@....com>
> > >
> > > The ISI module on i.MX95 supports up to eight channels and four link
> > > sources to obtain the image data for processing in its pipelines. It
> > > can process up to eight image sources at the same time.
> > >
> > > Signed-off-by: Guoniu Zhou <guoniu.zhou@....com>
> > > ---
> > >  .../devicetree/bindings/media/nxp,imx8-isi.yaml    | 26 +++++++++++++++++++++-
> > >  1 file changed, 25 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/Documentation/devicetree/bindings/media/nxp,imx8-isi.yaml b/Documentation/devicetree/bindings/media/nxp,imx8-isi.yaml
> > > index f43b91984f0152fbbcf80db3b3bbad7e8ad6c11e..eaab98ecf343a2cd3620f7469c016c3955d37406 100644
> > > --- a/Documentation/devicetree/bindings/media/nxp,imx8-isi.yaml
> > > +++ b/Documentation/devicetree/bindings/media/nxp,imx8-isi.yaml
> > > @@ -23,6 +23,7 @@ properties:
> > >        - fsl,imx8mp-isi
> > >        - fsl,imx8ulp-isi
> > >        - fsl,imx93-isi
> > > +      - fsl,imx95-isi
> > >
> > >    reg:
> > >      maxItems: 1
> > > @@ -49,7 +50,7 @@ properties:
> > >    interrupts:
> > >      description: Processing pipeline interrupts, one per pipeline
> > >      minItems: 1
> > > -    maxItems: 2
> > > +    maxItems: 8
> > >
> > >    power-domains:
> > >      maxItems: 1
> > > @@ -109,6 +110,29 @@ allOf:
> > >              - port@0
> > >              - port@1
> > >
> > > +  - if:
> > > +      properties:
> > > +        compatible:
> > > +          contains:
> > > +            const: fsl,imx95-isi
> > > +    then:
> > > +      properties:
> > > +        interrupts:
> > > +          maxItems: 8
> >
> > should minItems: 8 because you already limit maxItems at top;
>
> As far as I understand, when no "items" are specified, minItems defaults
> to 1, and maxItems defaults to minItems (if specified) or 0 (if minItems
> is not specified). This is implemented in dtschema/lib.py of
> https://github.com/devicetree-org/dt-schema.git.
>
> Then, in dtschema/fixups.py, if only one of minItems or maxItems is
> specified, the other one is set to the same value. I believe relying on
> this is frowned upon by the DT maintainers.
>
> We could specify minItems only here, as the top-level constraint will
> ensure we don't go over 8. That's not very future-proof though, so I
> think specifying both minItems and maxItems would be best. Confirmation
> from a DT maintainer would be appreciated.

I pretty sure I am correct. please below thread, I met many similar cases
before.
https://lore.kernel.org/imx/72c29785-eb7a-4cc8-a74c-3aad50129a23@kernel.org/

Frank

>
> The fsl,imx8mp-isi block above should then be fixed. It currently only
> has maxItems set, minItems should be set to 2 as well.
>
> > > +        ports:
> > > +          properties:
> > > +            port@0:
> > > +              description: Pixel Link Slave 0
> > > +            port@1:
> > > +              description: Pixel Link Slave 1
> > > +            port@2:
> > > +              description: MIPI CSI-2 RX 0
> > > +            port@3:
> > > +              description: MIPI CSI-2 RX 1
> > > +          required:
> > > +            - port@2
> > > +            - port@3
> > > +
> >
> >      else
> >        properties:
> >          interrupts:
> >            maxItem: 2
> >
> > to keep the same restriction for existed compatible string.
>
> We already specify the number of interrupts in two separate conditional
> blocks above, with any else statement (for all but fsl,imx8mp-isi first,
> and then for fsl,imx8mp-isi). Both specify maxItems, so I think we're
> fine.
>
> > >  additionalProperties: false
> > >
> > >  examples:
>
> --
> Regards,
>
> Laurent Pinchart