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Date: Tue, 30 Jan 2024 14:34:13 -0600
From: Rob Herring <robh@kernel.org>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Cc: =?utf-8?B?UmFmYcWCIE1pxYJlY2tp?= <zajec5@gmail.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	devicetree@vger.kernel.org, linux-clk@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org,
	=?utf-8?B?UmFmYcWCIE1pxYJlY2tp?= <rafal@milecki.pl>,
	Russell King <linux@armlinux.org.uk>,
	Daniel Lezcano <daniel.lezcano@linaro.org>,
	Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH 2/3] dt-bindings: arm: mediatek: convert PCIESYS to the
 json-schema
Message-ID: <20240130203413.GA2290196-robh@kernel.org>
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On Tue, Jan 23, 2024 at 12:20:29PM +0100, AngeloGioacchino Del Regno wrote:
> Il 23/01/24 09:20, Rafał Miłecki ha scritto:
> > From: Rafał Miłecki <rafal@milecki.pl>
> > 
> > This helps validating DTS files. Introduced changes:
> > 1. Documented "reg" property
> > 2. Adjusted "reg" in example
> > 
> > Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
> > ---
> >   .../arm/mediatek/mediatek,mt7622-pciesys.yaml | 47 +++++++++++++++++++
> >   .../arm/mediatek/mediatek,pciesys.txt         | 25 ----------
> >   2 files changed, 47 insertions(+), 25 deletions(-)
> >   create mode 100644 Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7622-pciesys.yaml
> >   delete mode 100644 Documentation/devicetree/bindings/arm/mediatek/mediatek,pciesys.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7622-pciesys.yaml b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7622-pciesys.yaml
> > new file mode 100644
> > index 000000000000..7340a2512402
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7622-pciesys.yaml
> 
> I think that we should really move all those clock controller yaml files to their
> proper directory, which would be
> 
> Documentation/devicetree/bindings/clock/
> 
> ...because those are clock controllers anyway and the fact that they do also
> provide a reset controller doesn't really justify having them in arm/mediatek.
> 
> Besides, I would appreciate if you could also move mt8186/92/95 and eventual
> others that are there to clock/.

Yes, please move it.

> 
> > @@ -0,0 +1,47 @@
> > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/arm/mediatek/mediatek,mt7622-pciesys.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: MediaTek PCIESYS controller
> > +
> > +description:
> > +  The MediaTek PCIESYS controller provides various clocks to the system.
> > +
> > +maintainers:
> > +  - Matthias Brugger <matthias.bgg@gmail.com>
> > +
> > +properties:
> > +  compatible:
> > +    items:
> > +      - enum:
> > +          - mediatek,mt7622-pciesys
> > +          - mediatek,mt7629-pciesys
> > +      - const: syscon
> 
> I know that there's syscon all over the place and, even if I admit I didn't check,
> I am fairly sure that there's absolutely no reason to have syscon there, and that
> the syscon compatible never did anything for (most of, or all of) those clock
> controllers, at all.
> 
> I'm not sure - though - if removing syscon during the txt->yaml conversion is
> acceptable (yeah we'd be cheating a bit), but something makes me say it is, because
> the bindings couldn't validate before that one as well.

As long as you state why you are removing it in the commit msg.

> 
> Of course you'd have to remove the syscon compatible from the affected device trees
> as well as omitting it here.

You could also do 'minItems: 1' and 'deprecated' in the 2nd item.

> However, to be sure that we're doing the right thing here, I have to summon someone
> that can actually give a definitive answer to what I just said.....
> 
> Krzysztof, please? :-)