linux-kernel - Re: [PATCH v2 03/15] dt-bindings: clock: Document qcom,gcc-ipq8064 binding

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Date:   Fri, 21 Jan 2022 13:22:30 -0600
From:   Rob Herring <robh@...nel.org>
To:     Ansuel Smith <ansuelsmth@...il.com>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Taniya Das <tdas@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 03/15] dt-bindings: clock: Document qcom,gcc-ipq8064 binding

On Fri, Jan 21, 2022 at 1:07 PM Ansuel Smith <ansuelsmth@...il.com> wrote:
>
> On Thu, Jan 20, 2022 at 08:04:03PM -0600, Rob Herring wrote:
> > On Fri, Jan 21, 2022 at 12:20:16AM +0100, Ansuel Smith wrote:
> > > Document qcom,gcc-ipq8064 binding needed to declare pxo and cxo source
> > > clocks. The gcc node is also used by the tsens driver, already documented,
> > > to get the calib nvmem cells and the base reg from gcc.
> > >
> > > Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
> > > ---
> > >  .../bindings/clock/qcom,gcc-ipq8064.yaml      | 70 +++++++++++++++++++
> > >  1 file changed, 70 insertions(+)
> > >  create mode 100644 Documentation/devicetree/bindings/clock/qcom,gcc-ipq8064.yaml
> > >
> > > diff --git a/Documentation/devicetree/bindings/clock/qcom,gcc-ipq8064.yaml b/Documentation/devicetree/bindings/clock/qcom,gcc-ipq8064.yaml
> > > new file mode 100644
> > > index 000000000000..abc76a46b2ca
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/clock/qcom,gcc-ipq8064.yaml
> > > @@ -0,0 +1,70 @@
> > > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/clock/qcom,gcc-ipq8064.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: Qualcomm Global Clock & Reset Controller Binding for IPQ8064
> > > +
> > > +allOf:
> > > +  - $ref: qcom,gcc.yaml#
> > > +
> > > +maintainers:
> > > +  - Ansuel Smith <ansuelsmth@...il.com>
> > > +
> > > +description: |
> > > +  Qualcomm global clock control module which supports the clocks, resets and
> > > +  power domains on IPQ8064.
> > > +
> > > +  See also:
> > > +  - dt-bindings/clock/qcom,gcc-ipq806x.h
> > > +  - dt-bindings/reset/qcom,gcc-ipq806x.h
> > > +
> > > +properties:
> >
> > This schema will never be applied because there is not a compatible
> > property to use for matching. The base/common schema is the one that
> > shouldn't have a compatible and then the specific schemas like this
> > one do.
> >
>
> Just to make things clear. To fix things up, what changes should I do?
> - I should remove the compatible from the base schema qcom,gcc.yaml
> - Add the compatible to this schema
> - Create another schema that includes all the others compatible?

Yes.

>
> Can I instead:
> - Create a qcom,gcc-common.yaml schema
> - Modify the qcom,gcc.yaml schema to ref the common one and drop the
>   other binding.
> - Fix this schema with the missing compatible?

That's fine. That's just a difference in filenames, right?

> Tell me how I should proceed since it looks to me that all the
> Documentation for the gcc driver looks a bit mess and full of
> duplicated stuff.

I think it was originally one document, but had too many if/then
schemas. Or maybe that was another QCom schema. There's no hard rule
on whether to split or not. It's a judgment call.

Rob