LKML Archive on lore.kernel.org
 help / color / Atom feed
From: Rob Herring <robh@kernel.org>
To: Stephen Boyd <sboyd@kernel.org>
Cc: devicetree@vger.kernel.org,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Michael Turquette <mturquette@baylibre.com>,
	linux-clk <linux-clk@vger.kernel.org>
Subject: Re: [PATCH] dt-bindings: clock: Convert fixed-clock binding to json-schema
Date: Fri, 11 Jan 2019 14:49:04 -0600
Message-ID: <CAL_JsqJFyC3AXwbd8PoJS1wZ5BSokAPcFi=4FF2DQ6yFi0XwCw@mail.gmail.com> (raw)
In-Reply-To: <154723284041.169631.6622751321828044091@swboyd.mtv.corp.google.com>

On Fri, Jan 11, 2019 at 12:54 PM Stephen Boyd <sboyd@kernel.org> wrote:
>
> Quoting Rob Herring (2019-01-11 10:27:48)
> > On Fri, Jan 11, 2019 at 11:44 AM Stephen Boyd <sboyd@kernel.org> wrote:
> > >
> > > Quoting Rob Herring (2019-01-10 14:19:01)
> > > > Convert the fixed-clock binding to DT schema format using json-schema.
> > > >
> > >
> > > Any pointer to the full schema?
> >
> > https://github.com/robherring/yaml-bindings/blob/master/schemas/
> >
> > And the clock schema in particular:
> > https://github.com/robherring/yaml-bindings/blob/master/schemas/clock.yaml
>
> Awesome. Thanks for the pointers! Is the clock schema posted to the list
> somewhere?

No. Happy to post things, but I'm struggling to find anyone that cares.

> > > > Cc: Michael Turquette <mturquette@baylibre.com>
> > > > Cc: Stephen Boyd <sboyd@kernel.org>
> > > > Cc: linux-clk@vger.kernel.org
> > > > Signed-off-by: Rob Herring <robh@kernel.org>
> > > [...]
> > > > diff --git a/Documentation/devicetree/bindings/clock/fixed-clock.yaml b/Documentation/devicetree/bindings/clock/fixed-clock.yaml
> > > > new file mode 100644
> > > > index 000000000000..8b5628463b90
> > > > --- /dev/null
> > > > +++ b/Documentation/devicetree/bindings/clock/fixed-clock.yaml
> > > > @@ -0,0 +1,44 @@
> > > > +# SPDX-License-Identifier: GPL-2.0
> > > > +%YAML 1.2
> > > > +---
> > > > +$id: http://devicetree.org/schemas/clock/fixed-clock.yaml#
> > > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > > +
> > > > +title: Binding for simple fixed-rate clock sources.
> > >
> > > Why does title have a full stop?
> >
> > Because it was there in the original. My script to extract just takes
> > the first line of alphanumeric text.
>
> Ok. I think it would be good to treat them like commit subjects that
> don't have the full stop either, so if the script is able to drop the
> full stop it would be great.

I can just write a meta-schema to enforce that. :)

> > > > +
> > > > +maintainers:
> > > > +  - Michael Turquette <mturquette@baylibre.com>
> > > > +  - Stephen Boyd <sboyd@kernel.org>
> > > > +
> > > > +properties:
> > > > +  compatible:
> > > > +    const: fixed-clock
> > > > +
> > > > +  "#clock-cells":
> > > > +    const: 0
> > > > +
> > > > +  clock-frequency: true
> > >
> > > Why doesn't this need the $ref: /schemas/types.yaml#/... thing?
> >
> > You might want to read bindings/example-schema.yaml which tries to
> > explain some of this.
> >
> > Standard properties are already defined in the core schemas. So we
> > only have to say "we use this property" and any binding specific
> > constraints. In this case, there aren't any other constraints. It is
> > also needed to be listed here to mark it required and to satisfy
> > 'additionalProperties: false'.
>
> Hmm ok. I suppose I'll have to hold that information in my mind when
> reviewing bindings. Is there any tooling or some script that I can run
> on json-schema bindings to verify they're correct? Or to find something
> redundant like this where a standard property is redefined? Grep would
> work for the redundant problem I suppose.

Yes, the meta-schema enforces this at least to the extent there is a
meta-schema defined for a standard property. Even if not something for
a specific property, we limit things to a subset of json-schema
keywords. Also, you also can't define something contradicting a core
schema (e.g. { reg: { type: string } }), but that wouldn't be found
until you check actual DTs.

The meta-schema check is run with:
make dt_binding_check

This is all documented in Documentation/devicetree/writing-schema.md.

Rob

  reply index

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-10 22:19 Rob Herring
2019-01-11 17:44 ` Stephen Boyd
2019-01-11 18:27   ` Rob Herring
2019-01-11 18:54     ` Stephen Boyd
2019-01-11 20:49       ` Rob Herring [this message]
2019-01-11 22:42         ` Stephen Boyd
2019-01-11 23:09           ` Rob Herring
2019-01-24 22:50             ` Stephen Boyd

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='CAL_JsqJFyC3AXwbd8PoJS1wZ5BSokAPcFi=4FF2DQ6yFi0XwCw@mail.gmail.com' \
    --to=robh@kernel.org \
    --cc=devicetree@vger.kernel.org \
    --cc=linux-clk@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mturquette@baylibre.com \
    --cc=sboyd@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

LKML Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/lkml/0 lkml/git/0.git
	git clone --mirror https://lore.kernel.org/lkml/1 lkml/git/1.git
	git clone --mirror https://lore.kernel.org/lkml/2 lkml/git/2.git
	git clone --mirror https://lore.kernel.org/lkml/3 lkml/git/3.git
	git clone --mirror https://lore.kernel.org/lkml/4 lkml/git/4.git
	git clone --mirror https://lore.kernel.org/lkml/5 lkml/git/5.git
	git clone --mirror https://lore.kernel.org/lkml/6 lkml/git/6.git
	git clone --mirror https://lore.kernel.org/lkml/7 lkml/git/7.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ https://lore.kernel.org/lkml \
		linux-kernel@vger.kernel.org linux-kernel@archiver.kernel.org
	public-inbox-index lkml


Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kernel


AGPL code for this site: git clone https://public-inbox.org/ public-inbox