linux-kernel - Re: [PATCH v6 2/7] dt-bindings: thermal: add YAML schema for sun8i-thermal driver bindings

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Date:   Wed, 27 Nov 2019 19:07:43 +0100
From:   Ondřej Jirman <megous@...ous.com>
To:     Maxime Ripard <mripard@...nel.org>
Cc:     Vasily Khoruzhick <anarsoul@...il.com>,
        Yangtao Li <tiny.windzz@...il.com>,
        Zhang Rui <rui.zhang@...el.com>,
        Eduardo Valentin <edubezval@...il.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@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 2/7] dt-bindings: thermal: add YAML schema for
 sun8i-thermal driver bindings

Hi,

On Wed, Nov 27, 2019 at 06:44:34PM +0100, Maxime Ripard wrote:
> Hi,
> 
> On Tue, Nov 26, 2019 at 09:29:30PM -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     | 103 ++++++++++++++++++
> >  1 file changed, 103 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..e622f0a4be90
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/thermal/allwinner,sun8i-a83t-ths.yaml
> > @@ -0,0 +1,103 @@
> > +# 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:
> > +    oneOf:
> > +      - const: allwinner,sun8i-a83t-ths
> > +      - const: allwinner,sun8i-h3-ths
> > +      - const: allwinner,sun8i-r40-ths
> > +      - const: allwinner,sun50i-a64-ths
> > +      - const: allwinner,sun50i-h5-ths
> > +      - const: allwinner,sun50i-h6-ths
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  interrupts:
> > +    maxItems: 1
> > +
> > +  resets:
> > +    maxItems: 1
> > +
> > +  clocks:
> > +    minItems: 1
> > +    maxItems: 2
> > +
> > +  clock-names:
> > +    anyOf:
> > +      - items:
> > +        - const: bus
> > +        - const: mod
> > +      - items:
> > +        - const: bus
> 
> This can be:
> 
> clock-names:
>   minItems: 1

Additionally, minItems should be 0, since A83T doesn't have bus clock/reset. And
then there should be a special case for A83T too with min/maxItems = 0 for both
resets and clocks.

regards,
	o.

>   maxItems: 2
>   items:
>     - const: bus
>     - const: mod
> 
> And the length should be checked based on the compatible value, with
> something like
> 
> if:
>   properties:
>     compatible:
>       contains:
>         const: allwinner,sun50i-h6-ths
> 
> then:
>   properties:
>     clocks:
>       maxItems: 1
> 
>     clock-names:
>       maxItems: 1
> 
> else:
>   properties:
>     clocks:
>       maxItems: 2
> 
>     clock-names:
>       maxItems: 2
> 
> > +
> > +  '#thermal-sensor-cells':
> > +    enum: [ 0, 1 ]
> > +    description: |
> > +      Definition depends on soc version:
> > +
> > +      For "allwinner,sun8i-h3-ths",
> > +      value must be 0.
> > +      For all other compatibles
> > +      value must be 1.
> 
> This should be checked using an if as well.
> 
> > +
> > +  nvmem-cells:
> > +    maxItems: 1
> > +    items:
> > +      - description: Calibration data for thermal sensors
> 
> You can drop the items and just move the description up one level,
> under nvmem-cells
> 
> > +
> > +  nvmem-cell-names:
> > +    items:
> > +      - const: calibration
> 
> Ditto for the const
> 
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - interrupts
> > +  - '#thermal-sensor-cells'
> 
> Whether clocks, clock-names and resets are thereshould be check using
> an if statement as well.
> 
> > +
> > +examples:
> > +  - |
> > +    ths_a83t: ths@...4000 {
> 
> You don't need the label at all, and the node name should be
> temperature-sensor according to the DT spec, not ths. This applies to
> all you examples.
> 
> > +         compatible = "allwinner,sun8i-a83t-ths";
> > +         reg = <0x01f04000 0x100>;
> > +         interrupts = <0 31 0>;
> > +         nvmem-cells = <&ths_calibration>;
> > +         nvmem-cell-names = "calibration";
> > +         #thermal-sensor-cells = <1>;
> > +    };
> 
> New line.
> 
> Thanks!
> Maxime