linux-kernel - Re: [PATCH] media: dt-bindings: ov8856: add missing second link frequency in example

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Message-ID: <ZW8Mz3OWE1ELlFRC@kekkonen.localdomain>
Date:   Tue, 5 Dec 2023 11:43:11 +0000
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: dt-bindings: ov8856: add missing second link
 frequency in example

On Tue, Dec 05, 2023 at 11:01:41AM +0000, Sakari Ailus wrote:
> Hi Krzysztof,
> 
> Thanks for the patch.
> 
> On Tue, Dec 05, 2023 at 09:48:35AM +0100, Krzysztof Kozlowski wrote:
> > Bindings and Linux driver require two link frequencies, so correct the
> > example:
> > 
> >   ov8856.example.dtb: camera@10: port:endpoint:link-frequencies:0: [360000000] is too short
> > 
> > Fixes: 066a94e28a23 ("media: dt-bindings: media: Use graph and video-interfaces schemas")
> > Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> > ---
> >  Documentation/devicetree/bindings/media/i2c/ov8856.yaml | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/media/i2c/ov8856.yaml b/Documentation/devicetree/bindings/media/i2c/ov8856.yaml
> > index 57f5e48fd8e0..bd1a55d767e7 100644
> > --- a/Documentation/devicetree/bindings/media/i2c/ov8856.yaml
> > +++ b/Documentation/devicetree/bindings/media/i2c/ov8856.yaml
> > @@ -126,7 +126,7 @@ examples:
> >                  wcam_out: endpoint {
> >                      remote-endpoint = <&mipi_in_wcam>;
> >                      data-lanes = <1 2 3 4>;
> > -                    link-frequencies = /bits/ 64 <360000000>;
> > +                    link-frequencies = /bits/ 64 <360000000 180000000>;
> 
> There indeed seems to be a problem with the example as far as the bindings
> are concerned but the primary issue seems to be in the bindings. Both of
> these frequencies have significance from driver point of view only while
> the device itself supports a (wider) range.
> 
> How about removing maxItems and items from the bindings instead?

There's also a similar issue with lanes: 1, 2 and 4 are supported.

-- 
Sakari Ailus