linux-kernel - Re: [PATCH v7 2/7] dt-bindings: thermal: add YAML schema for sun8i-thermal driver bindings

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Date:   Thu, 19 Dec 2019 10:12:42 +0100
From:   Maxime Ripard <mripard@...nel.org>
To:     Vasily Khoruzhick <anarsoul@...il.com>
Cc:     Yangtao Li <tiny.windzz@...il.com>,
        Zhang Rui <rui.zhang@...el.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Kucheria <amit.kucheria@...durent.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Chen-Yu Tsai <wens@...e.org>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        arm-linux <linux-arm-kernel@...ts.infradead.org>,
        Ondřej Jirman <megous@...ous.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 2/7] dt-bindings: thermal: add YAML schema for
 sun8i-thermal driver bindings

On Wed, Dec 18, 2019 at 02:27:00PM -0800, Vasily Khoruzhick wrote:
> On Wed, Dec 18, 2019 at 2:00 PM Maxime Ripard <mripard@...nel.org> wrote:
> > On Tue, Dec 17, 2019 at 08:21:16PM -0800, Vasily Khoruzhick wrote:
> > > From: Yangtao Li <tiny.windzz@...il.com>
> > >
> > > sun8i-thermal driver supports thermal sensor in wide range of Allwinner
> > > SoCs. Add YAML schema for its bindings.
> > >
> > > Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
> > > Signed-off-by: Vasily Khoruzhick <anarsoul@...il.com>
> > > ---
> > >  .../thermal/allwinner,sun8i-a83t-ths.yaml     | 146 ++++++++++++++++++
> > >  1 file changed, 146 insertions(+)
> > >  create mode 100644 Documentation/devicetree/bindings/thermal/allwinner,sun8i-a83t-ths.yaml
> > >
> > > diff --git a/Documentation/devicetree/bindings/thermal/allwinner,sun8i-a83t-ths.yaml b/Documentation/devicetree/bindings/thermal/allwinner,sun8i-a83t-ths.yaml
> > > new file mode 100644
> > > index 000000000000..8768c2450633
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/thermal/allwinner,sun8i-a83t-ths.yaml
> > > @@ -0,0 +1,146 @@
> > > +# SPDX-License-Identifier: GPL-2.0
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/thermal/allwinner,sun8i-a83t-ths.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: Allwinner SUN8I Thermal Controller Device Tree Bindings
> > > +
> > > +maintainers:
> > > +  - Yangtao Li <tiny.windzz@...il.com>
> > > +
> > > +properties:
> > > +  compatible:
> > > +    enum:
> > > +      - allwinner,sun8i-a83t-ths
> > > +      - allwinner,sun8i-h3-ths
> > > +      - allwinner,sun8i-r40-ths
> > > +      - allwinner,sun50i-a64-ths
> > > +      - allwinner,sun50i-h5-ths
> > > +      - allwinner,sun50i-h6-ths
> > > +
> > > +  reg:
> > > +    maxItems: 1
> > > +
> > > +  interrupts:
> > > +    maxItems: 1
> > > +
> > > +  resets:
> > > +    maxItems: 1
> > > +
> > > +  nvmem-cells:
> > > +    maxItems: 1
> > > +    description: Calibration data for thermal sensors
> > > +
> > > +  nvmem-cell-names:
> > > +    const: calibration
> > > +
> > > +allOf:
> > > +  - if:
> > > +      properties:
> > > +        compatible:
> > > +          contains:
> > > +            const: allwinner,sun50i-h6-ths
> > > +
> > > +    then:
> > > +      properties:
> > > +        clocks:
> > > +          minItems: 1
> > > +          maxItems: 1
> >
> > When minItems and maxItems are equal, you can only set one, the other
> > will be filled automatically.
>
> Is it documented anywhere? I have a feeling like I'm shooting in the
> dark. So far I've read Documentation/devicetree/writing-schema.rst,
> Documentation/devicetree/bindings/example-schema.yaml and few other
> schemas for inspiration but yet I don't have solid understanding how
> it's supposed to be written. Examples are pretty scarce and figuring
> out why certain construction doesn't work is pretty tricky.

It's somewhat documented with
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/example-schema.yaml#n80
and
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/example-schema.yaml#n102

But I guess it wasn't clear enough? Feel free to update it to
something that would be better

Maxime

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