Re: [PATCH v6 3/4] dt-bindings: pwm: add IPQ6018 binding

[Rob Herring <robh+dt@kernel.org>]

On Sun, Jul 25, 2021 at 12:27 PM Bjorn Andersson
<bjorn.andersson@linaro.org> wrote:
>
> On Thu 22 Jul 05:01 CDT 2021, Baruch Siach wrote:
>
> > DT binding for the PWM block in Qualcomm IPQ6018 SoC.
> >
> > Signed-off-by: Baruch Siach <baruch@tkos.co.il>
> > ---
> > v6:
> >
> >   Device node is child of TCSR; remove phandle (Rob Herring)
> >
> >   Add assigned-clocks/assigned-clock-rates (Uwe Kleine-König)
> >
> > v5: Use qcom,pwm-regs for phandle instead of direct regs (Bjorn
> >     Andersson, Kathiravan T)
> >
> > v4: Update the binding example node as well (Rob Herring's bot)
> >
> > v3: s/qcom,pwm-ipq6018/qcom,ipq6018-pwm/ (Rob Herring)
> >
> > v2: Make #pwm-cells const (Rob Herring)
> > ---
> >  .../devicetree/bindings/pwm/ipq-pwm.yaml      | 69 +++++++++++++++++++
> >  1 file changed, 69 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/pwm/ipq-pwm.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/pwm/ipq-pwm.yaml b/Documentation/devicetree/bindings/pwm/ipq-pwm.yaml
> > new file mode 100644
> > index 000000000000..ee2bb03a1223
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/pwm/ipq-pwm.yaml
> > @@ -0,0 +1,69 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/pwm/ipq-pwm.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Qualcomm IPQ6018 PWM controller
> > +
> > +maintainers:
> > +  - Baruch Siach <baruch@tkos.co.il>
> > +
> > +properties:
> > +  "#pwm-cells":
> > +    const: 2
> > +
> > +  compatible:
> > +    const: qcom,ipq6018-pwm
> > +
> > +  offset:
> > +    description: |
>
> '|' maintains the formatting of the text, you don't need that.
>
> > +      Offset of PWM register in the TCSR block.
> > +    maxItems: 1
> > +
> > +  clocks:
> > +    maxItems: 1
> > +
> > +  clock-names:
> > +    const: core
>
> With a single clock, it's nice to skip the -names.
>
> > +
> > +  assigned-clocks:
> > +    maxItems: 1
> > +
> > +  assigned-clock-rates:
> > +    maxItems: 1
>
> These (assigned-*) are generic properties that may be used on a lot of
> nodes, should they really be part of the individual binding, Rob?

They are allowed on any node with 'clocks', so you don't need them.
However, if you know there's 1 entry only, then I'd keep that. Or was
'maxItems: 1' just copied because I see that alot.

Rob