linux-kernel - Re: [PATCH 1/2] dt-bindings: clock: Add binding for Loongson-1 clock driver

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Message-ID: <CAJhJPsV5wC_fNgP9iSi1bUp+HFY=dgyh4-x0OueZ8fQO=p7r8w@mail.gmail.com>
Date:   Tue, 17 Jan 2023 18:31:29 +0800
From:   Kelvin Cheung <keguang.zhang@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Subject: Re: [PATCH 1/2] dt-bindings: clock: Add binding for Loongson-1 clock driver

Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> 于2023年1月13日周五 19:17写道：
>
> On 13/01/2023 12:07, Keguang Zhang wrote:
> > Add devicetree binding document for the Loongson-1 clock driver.
>
> Subject: drop second/last, redundant "bindings". The "dt-bindings"
> prefix is already stating that these are bindings.
>
> Subject: Drop driver, not related to hardware.

Wil do.
>
> >
> > Signed-off-by: Keguang Zhang <keguang.zhang@...il.com>
> > ---
> >  .../bindings/clock/loongson,ls1x-clk.yaml     | 81 +++++++++++++++++++
> >  1 file changed, 81 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/clock/loongson,ls1x-clk.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/clock/loongson,ls1x-clk.yaml b/Documentation/devicetree/bindings/clock/loongson,ls1x-clk.yaml
> > new file mode 100644
> > index 000000000000..4709c6757f1e
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/clock/loongson,ls1x-clk.yaml
> > @@ -0,0 +1,81 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/clock/loongson,ls1x-clk.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Loongson-1 Clock Controller
>
> Wasn't this already sent?
> https://lore.kernel.org/all/20190130194731.GA25716@bogus/
> Then this is a v4? Aren't you duplicating efforts (and reviewers efforts)?

Sorry. I didn't notice that patch.
This binding is totally different from that, which goes with the
following driver re-implementation.
>
> > +
> > +maintainers:
> > +  - Keguang Zhang <keguang.zhang@...il.com>
> > +
> > +properties:
>
> compatible is a first property.

Will do.
>
> > +  "#clock-cells":
> > +    const: 0
> > +
> > +  compatible:
> > +    enum:
> > +      - loongson,ls1b-clk-pll
> > +      - loongson,ls1b-clk-cpu
> > +      - loongson,ls1b-clk-ahb
> > +      - loongson,ls1c-clk-pll
> > +      - loongson,ls1c-clk-cpu
> > +      - loongson,ls1c-clk-ahb
>
> Are you registering single clocks? It looks like. No, make a proper
> clock controller.

This binding contains two types of clock, pll-clk and div-clk.
Should I split the binding to two bindings files?
>
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  clocks:
> > +    maxItems: 1
> > +
> > +required:
> > +  - "#clock-cells"
> > +  - compatible
> > +  - clocks
> > +  - reg
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    clocks {
>
> No, not really related to the binding.

Should I remove the "clocks" section?
>
> > +        #address-cells = <1>;
> > +        #size-cells = <1>;
> > +        ranges;
> > +
> > +        xtal: xtal {
>
> Incorrect in this context. Missing unit address.

XTAL doesn't have reg property.
>
> > +            compatible = "fixed-clock";
> > +            #clock-cells = <0>;
> > +            clock-frequency = <33000000>;
> > +        };
> > +
> > +        pll: pll@...78030 {
>
> Node names should be generic, so "clock-controller"
> https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation

Will change the node name.
>
> > +            compatible = "loongson,ls1b-clk-pll";
> > +            #clock-cells = <0>;
> > +            clocks = <&xtal>;
> > +            reg = <0x1fe78030 0x4>;
>
> compatible is first property, then reg, then the rest.

Will do.
>
> > +        };
> > +
> > +        cpu_clk: cpu_clk@...78034 {
>
> No underscores in node names. Anyway this should be gone - make a proper
> clock controller.

Will change the node name.
>
>
> Best regards,
> Krzysztof
>


-- 
Best regards,

Kelvin Cheung