linux-kernel - Re: [PATCH v4 1/6] dt-bindings: clock: meson: add A1 PLL clock controller bindings

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Date:   Wed, 18 Dec 2019 13:57:48 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Jian Hu <jian.hu@...ogic.com>
Cc:     Jerome Brunet <jbrunet@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Rob Herring <robh@...nel.org>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Qiufang Dai <qiufang.dai@...ogic.com>,
        Jianxin Pan <jianxin.pan@...ogic.com>,
        Victor Wan <victor.wan@...ogic.com>,
        Chandle Zou <chandle.zou@...ogic.com>,
        linux-clk@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v4 1/6] dt-bindings: clock: meson: add A1 PLL clock
 controller bindings

On Wed, Dec 18, 2019 at 04:00:20PM +0800, Jian Hu wrote:
> Hi Maxime
>
> Thanks for your review
>
> On 2019/12/13 18:38, Maxime Ripard wrote:
> > Hi,
> >
> > On Fri, Dec 06, 2019 at 03:40:47PM +0800, Jian Hu wrote:
> > > Add the documentation to support Amlogic A1 PLL clock driver,
> > > and add A1 PLL clock controller bindings.
> > >
> > > Signed-off-by: Jian Hu <jian.hu@...ogic.com>
> > > ---
> > >   .../bindings/clock/amlogic,a1-pll-clkc.yaml   | 59 +++++++++++++++++++
> > >   include/dt-bindings/clock/a1-pll-clkc.h       | 16 +++++
> > >   2 files changed, 75 insertions(+)
> > >   create mode 100644 Documentation/devicetree/bindings/clock/amlogic,a1-pll-clkc.yaml
> > >   create mode 100644 include/dt-bindings/clock/a1-pll-clkc.h
> > >
> > > diff --git a/Documentation/devicetree/bindings/clock/amlogic,a1-pll-clkc.yaml b/Documentation/devicetree/bindings/clock/amlogic,a1-pll-clkc.yaml
> > > new file mode 100644
> > > index 000000000000..7feeef5abf1b
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/clock/amlogic,a1-pll-clkc.yaml
> > > @@ -0,0 +1,59 @@
> > > +/* SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
> > > +/*
> > > + * Copyright (c) 2019 Amlogic, Inc. All rights reserved.
> > > + */
> > > +%YAML 1.2
> > > +---
> > > +$id: "http://devicetree.org/schemas/clock/amlogic,a1-pll-clkc.yaml#"
> > > +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> > > +
> > > +title: Amlogic Meson A/C serials PLL Clock Control Unit Device Tree Bindings
> > > +
> > > +maintainers:
> > > +  - Neil Armstrong <narmstrong@...libre.com>
> > > +  - Jerome Brunet <jbrunet@...libre.com>
> > > +  - Jian Hu <jian.hu@...n.hu.com>
> > > +
> > > +properties:
> > > +  compatible:
> > > +    - enum:
> > > +        - amlogic,a1-pll-clkc
> >
> > I'm not sure this works, compatible shouldn't contain a list.
> >
> I refered to
> Documentation/devicetree/bindings/clock/allwinner,sun4i-a10-ccu.yaml.
>
> I have used 'dt-doc-validate' tools to check, it will report something wrong
> below.
>
> properties:compatible: [{'enum': ['amlogic,a1-pll-clkc']}] is not of type
> 'object', 'boolean'
>
> Refer to
> https://github.com/robherring/dt-schema/blob/master/example-schema.yaml
>
> I will change it like this:
>
> properties:
>   compatible:
>     oneOf:
>       - enum:
>          - amlogic,a1-pll-clkc
>
> And It has been passed by 'dt-doc-validate' tools.
>
> Is it right?

You can simply do

properties:
  compatible:
    const: amlogic,a1-pll-clkc

> > You can write this like:
> > compatible:
> >    const: amlogic,a1-pll-clkc
> >
> > > +  "#clock-cells":
> > > +    const: 1
> > > +
> > > +  reg:
> > > +    maxItems: 1
> > > +
> > > +clocks:
> > > +  minItems: 2
> > > +  maxItems: 2
> >
> > This is redundant, it will be added automatically by the tools ...
> If I remove the minItems, it will pass by dt-doc-validate.
>
> Would please tell how to use dt-schema to generate automatically it?

You don't have to do anything, it's just done at the tools runtime.

Maxime

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