linux-kernel - Re: [PATCH 1/1] dt-bindings: timer: Convert ingenic,tcu.txt to YAML

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Message-ID: <CAL_JsqL7b8mwtg3XyNS2fdA4fxaFdUpsfqTPx521pW5xqSPneg@mail.gmail.com>
Date:   Mon, 2 Mar 2020 13:07:20 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Mark Rutland <mark.rutland@....com>,
        周琰杰 <zhouyanjie@...yeetech.com>, od@...c.me,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 1/1] dt-bindings: timer: Convert ingenic,tcu.txt to YAML

On Mon, Mar 2, 2020 at 12:25 PM Paul Cercueil <paul@...pouillou.net> wrote:
>
> Hi Rob,
>
>
> Le lun., mars 2, 2020 at 11:06, Rob Herring <robh+dt@...nel.org> a
> écrit :
> > On Sun, Mar 1, 2020 at 11:47 AM Paul Cercueil <paul@...pouillou.net>
> > wrote:
> >>
> >
> > Well, this flew into linux-next quickly and breaks 'make
> > dt_binding_check'... Please drop, revert or fix quickly.
>
> For my defense I said to merge "provided Rob acks it" ;)
>
> >>  Convert the ingenic,tcu.txt file to YAML.
> >>
> >>  Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> >>  ---
> >>   .../devicetree/bindings/timer/ingenic,tcu.txt | 138 ----------
> >>   .../bindings/timer/ingenic,tcu.yaml           | 235
> >> ++++++++++++++++++
> >>   2 files changed, 235 insertions(+), 138 deletions(-)
> >>   delete mode 100644
> >> Documentation/devicetree/bindings/timer/ingenic,tcu.txt
> >>   create mode 100644
> >> Documentation/devicetree/bindings/timer/ingenic,tcu.yaml
> >
> >
> >>  diff --git
> >> a/Documentation/devicetree/bindings/timer/ingenic,tcu.yaml
> >> b/Documentation/devicetree/bindings/timer/ingenic,tcu.yaml
> >>  new file mode 100644
> >>  index 000000000000..1ded3b4762bb
> >>  --- /dev/null
> >>  +++ b/Documentation/devicetree/bindings/timer/ingenic,tcu.yaml
> >>  @@ -0,0 +1,235 @@
> >>  +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> >>  +%YAML 1.2
> >>  +---
> >>  +$id: http://devicetree.org/schemas/timer/ingenic,tcu.yaml#
> >>  +$schema: http://devicetree.org/meta-schemas/core.yaml#
> >>  +
> >>  +title: Ingenic SoCs Timer/Counter Unit (TCU) devicetree bindings
> >>  +
> >>  +description: |
> >>  +  For a description of the TCU hardware and drivers, have a look at
> >>  +  Documentation/mips/ingenic-tcu.rst.
> >>  +
> >>  +maintainers:
> >>  +  - Paul Cercueil <paul@...pouillou.net>
> >>  +
> >>  +properties:
> >>  +  $nodename:
> >>  +    pattern: "^timer@.*"
> >
> > '.*' is redundant.
> >
> >>  +
> >>  +  "#address-cells":
> >>  +    const: 1
> >>  +
> >>  +  "#size-cells":
> >>  +    const: 1
> >>  +
> >>  +  "#clock-cells":
> >>  +    const: 1
> >>  +
> >>  +  "#interrupt-cells":
> >>  +    const: 1
> >>  +
> >>  +  interrupt-controller: true
> >>  +
> >>  +  ranges: true
> >>  +
> >>  +  compatible:
> >>  +    items:
> >>  +      - enum:
> >>  +        - ingenic,jz4740-tcu
> >>  +        - ingenic,jz4725b-tcu
> >>  +        - ingenic,jz4770-tcu
> >>  +        - ingenic,x1000-tcu
> >>  +      - const: simple-mfd
> >
> > This breaks several examples in dt_binding_check because this schema
> > will be applied to every 'simple-mfd' node. You need a custom select
> > entry that excludes 'simple-mfd'. There should be several examples in
> > tree to copy.
>
> Why would it be applied to all 'single-mfd' nodes?

single-mfd?

The way the tool decides to apply a schema or not is my matching on
any of the compatible strings (or node name if no compatible
specified). You can override this with 'select'.

> Doesn't what I wrote
> specify that it needs one of ingenic,*-tcu _and_ simple-mfd?

Yes, but matching is on any of them. You need to add:

select:
  properties:
    compatible:
      contains:
        enum:
          - ingenic,jz4740-tcu
          - ingenic,jz4725b-tcu
          - ingenic,jz4770-tcu
          - ingenic,x1000-tcu
  required:
    - compatible

> I'm not sure I understand what you mean.
>
> I did grep for 'single-mfd' in all YAML files in Documentation/ and
> nothing really stands out.

I guess even without the typo it was harder to find an example than I thought.

Note that I think I'll make the tool exclude 'simple-mfd', but it will
take some time for users to update so you still need to fix this.

Rob