Re: [PATCH 1/2] media: dt-bindings: media: camss: Restrict bus-type property
From: Luca Weiss
Date: Fri Dec 13 2024 - 04:39:21 EST
On Fri Dec 13, 2024 at 10:34 AM CET, Krzysztof Kozlowski wrote:
> On Mon, Dec 09, 2024 at 01:01:05PM +0100, Luca Weiss wrote:
> > The CSIPHY of Qualcomm SoCs support both D-PHY and C-PHY standards for
> > CSI-2, but not any others so restrict the bus-type property describing
> > this to the supported values.
> >
> > The only exception here is MSM8916 which only supports D-PHY. C-PHY was
> > introduced with newer SoCs.
> >
> > Do note, that currently the Linux driver only supports D-PHY.
> >
> > Signed-off-by: Luca Weiss <luca.weiss@xxxxxxxxxxxxx>
> > ---
> > .../bindings/media/qcom,msm8916-camss.yaml | 8 ++++++
> > .../bindings/media/qcom,msm8953-camss.yaml | 15 +++++++++++
> > .../bindings/media/qcom,msm8996-camss.yaml | 20 +++++++++++++++
> > .../bindings/media/qcom,sc8280xp-camss.yaml | 20 +++++++++++++++
> > .../bindings/media/qcom,sdm660-camss.yaml | 20 +++++++++++++++
> > .../bindings/media/qcom,sdm845-camss.yaml | 20 +++++++++++++++
> > .../bindings/media/qcom,sm8250-camss.yaml | 30 ++++++++++++++++++++++
> > 7 files changed, 133 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/media/qcom,msm8916-camss.yaml b/Documentation/devicetree/bindings/media/qcom,msm8916-camss.yaml
> > index 9cc0a968a401836814560c1af3ee84d946500b4f..3de2a3d2b5b761106975aab65ff614b2ef579ef5 100644
> > --- a/Documentation/devicetree/bindings/media/qcom,msm8916-camss.yaml
> > +++ b/Documentation/devicetree/bindings/media/qcom,msm8916-camss.yaml
> > @@ -94,6 +94,10 @@ properties:
> > minItems: 1
> > maxItems: 4
> >
> > + bus-type:
> > + enum:
> > + - 4 # MEDIA_BUS_TYPE_CSI2_DPHY
> > +
> > required:
> > - data-lanes
> >
> > @@ -113,6 +117,10 @@ properties:
> > minItems: 1
> > maxItems: 4
> >
> > + bus-type:
> > + enum:
> > + - 4 # MEDIA_BUS_TYPE_CSI2_DPHY
> > +
> > required:
> > - data-lanes
> >
> > diff --git a/Documentation/devicetree/bindings/media/qcom,msm8953-camss.yaml b/Documentation/devicetree/bindings/media/qcom,msm8953-camss.yaml
> > index 8856fba385b1123d748199b46c5009c97700ad9b..6d776b0ca71140c0816b246dbaf41ef376205bba 100644
> > --- a/Documentation/devicetree/bindings/media/qcom,msm8953-camss.yaml
> > +++ b/Documentation/devicetree/bindings/media/qcom,msm8953-camss.yaml
> > @@ -112,6 +112,11 @@ properties:
> > minItems: 1
> > maxItems: 4
> >
> > + bus-type:
> > + enum:
> > + - 1 # MEDIA_BUS_TYPE_CSI2_CPHY
>
> Just 1
>
> > + - 4 # MEDIA_BUS_TYPE_CSI2_DPHY
>
> Just 4
>
> The type and meaning is already stated by video-interfaces and the
> binding headers.
This is actually something I find rather curious why this is not done
more obvious, e.g. there's basically no link that a '4' is
MEDIA_BUS_TYPE_CSI2_DPHY from dt-bindings/media/video-interfaces.h
video-interfaces.yaml only states "- 4 # MIPI CSI-2 D-PHY" and it's then
the users excercise to find MEDIA_BUS_TYPE_CSI2_DPHY for that.
Regards
Luca
>
> Anyway:
>
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
>
> Best regards,
> Krzysztof