linux-kernel - Re: [PATCH 1/2] dt-bindings: clock: Add reg-clock-controller

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Message-ID: <4dc69da7d894621817e74697fccf36a1.sboyd@kernel.org>
Date:   Mon, 17 Apr 2023 17:14:47 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Rob Herring <robh@...nel.org>, Yangfl <mmyangfl@...il.com>
Cc:     linux-clk@...r.kernel.org,
        Michael Turquette <mturquette@...libre.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: clock: Add reg-clock-controller

Quoting Yangfl (2023-04-17 14:39:23)
> Rob Herring <robh@...nel.org> 于2023年4月18日周二 04:49写道：
> >
> > On Sat, Apr 15, 2023 at 02:12:59AM +0800, David Yang wrote:
> > > Add DT bindings documentation for reg-clock-controller, collection of
> > > basic clocks common to many platforms.
> > >
> > > Signed-off-by: David Yang <mmyangfl@...il.com>
> > > ---
> > >  .../bindings/clock/reg-clock-controller.yaml  | 245 ++++++++++++++++++
> > >  1 file changed, 245 insertions(+)
> > >  create mode 100644 Documentation/devicetree/bindings/clock/reg-clock-controller.yaml
> > >
> > > diff --git a/Documentation/devicetree/bindings/clock/reg-clock-controller.yaml b/Documentation/devicetree/bindings/clock/reg-clock-controller.yaml
> > > new file mode 100644
> > > index 000000000000..a6a7e0b05821
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/clock/reg-clock-controller.yaml
> > > @@ -0,0 +1,245 @@
> > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/clock/reg-clock-controller.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: Simple straight-forward register-based clocks
> >
> > 'simple' means extended one property at a time with little foresight. In
> > the end, 'simple' bindings are never simple. s/simple/generic/ as well.
> >
> > When we first started the clock binding, we had exactly this. There's
> > still bindings for at least some of it. It turned out to be a bad
> > idea because it was difficult to get correct and complete. So this
> > binding is exactly what we don't want.
> >
> > Rob
> 
> Thanks. So in the next version v2, clock-controller are made merely
> container of clocks. The real jobs are done by sub clock nodes, so
> that clocks, with or without hardware-specific clock types
> "compatible", can be declared independently and individually as dt
> nodes, instead of hardware clock "controllers" with quite arbitrary
> clock identifiers listed under include/dt-bindings/clock/.

No. Write actual drivers and actual bindings for real devices.