Re: [PATCH v1 2/2] media: dt-bindings: media: camss: Document clock-lanes property

[Robert Foss]

On Mon, 1 Nov 2021 at 21:30, Rob Herring <robh@xxxxxxxxxx> wrote:
>
> On Mon, Oct 25, 2021 at 12:33:22PM +0200, Robert Foss wrote:
> > The clock-lanes property corresponds to a hardware register field
> > that is required to be set, in order to enable the CSI clock signal.
> >
> > The physical lane of the clock signal is not programmable, but only
> > togglable On or Off, which what BIT(7) of the
> > CSIPHY_3PH_CMN_CSI_COMMON_CTRLn(5) register controls.
> >
> > Signed-off-by: Robert Foss <robert.foss@xxxxxxxxxx>
> > ---
> >  .../devicetree/bindings/media/qcom,msm8996-camss.yaml        | 5 +++++
> >  .../devicetree/bindings/media/qcom,sdm660-camss.yaml         | 5 +++++
> >  .../devicetree/bindings/media/qcom,sdm845-camss.yaml         | 5 +++++
> >  3 files changed, 15 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/media/qcom,msm8996-camss.yaml b/Documentation/devicetree/bindings/media/qcom,msm8996-camss.yaml
> > index 38be41e932f0..d4da1fad12cf 100644
> > --- a/Documentation/devicetree/bindings/media/qcom,msm8996-camss.yaml
> > +++ b/Documentation/devicetree/bindings/media/qcom,msm8996-camss.yaml
> > @@ -106,6 +106,11 @@ properties:
> >
> >              properties:
> >                clock-lanes:
> > +                description:
> > +                  The index of the clock-lane is not programmable by
> > +                  the hardware, but is required to define a CSI port.
> > +                  Lane 7 reflects the hardware register field that enables
> > +                  the clock lane.
>
> If it is fixed, then it should not be required. Fix the required part.
>
> >                  items:
> >                    - const: 7
>
> I don't know how we let that in, but this should be the lane number.
> Each binding can't be making up its own interpretation.

If the clock lane number isn't programmable, can clock-lanes be omitted?