linux-kernel - Re: [PATCH 2/6] dt-bindings: clock: Bindings for Meson T7 clock controller

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Message-ID: <CAJX_Q+2Gm6mr_2cbhCh7a_bOw09W2PBxyOAvasGCrPTdcruczQ@mail.gmail.com>
Date:   Sun, 18 Jun 2023 18:39:17 +0100
From:   Lucas Tanure <tanure@...ux.com>
To:     Conor Dooley <conor@...nel.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Jerome Brunet <jbrunet@...libre.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Kevin Hilman <khilman@...libre.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nick <nick@...das.com>, Artem <art@...das.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-amlogic@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH 2/6] dt-bindings: clock: Bindings for Meson T7 clock controller

On Thu, Jun 15, 2023 at 10:41 PM Conor Dooley <conor@...nel.org> wrote:
>
> Hey Lucas,
>
> On Thu, Jun 15, 2023 at 07:29:34PM +0100, Lucas Tanure wrote:
> > Add documentation for T7 the clock controller.
>
> Other than the bot's complaint, few comments for ya.
>
> > Signed-off-by: Lucas Tanure <tanure@...ux.com>
> > ---
> >  .../bindings/clock/amlogic,mesont7.yaml       |  69 +++
> >  include/dt-bindings/clock/mesont7-clkc.h      | 487 ++++++++++++++++++
> >  2 files changed, 556 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/clock/amlogic,mesont7.yaml
> >  create mode 100644 include/dt-bindings/clock/mesont7-clkc.h
> >
> > diff --git a/Documentation/devicetree/bindings/clock/amlogic,mesont7.yaml b/Documentation/devicetree/bindings/clock/amlogic,mesont7.yaml
> > new file mode 100644
> > index 000000000000..18e7cca0c0e1
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/clock/amlogic,mesont7.yaml
>
> The filename should match the compatible - please test the bindings,
> dt_binding_check will complain.
>
> > @@ -0,0 +1,69 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/clock/amlogic,mesont7-clk.yaml#
>
> and this should match the filename
>
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Amlogic Meson T7 Clock Controller
> > +
> > +maintainers:
> > +  - Lucas Tanure <tanure@...ux.com>
> > +
> > +description: |
> > +  The Amlogic Meson T7 clock controller generates and supplies clock to
> > +  various peripherals within the SoC.
> > +
> > +  This binding uses common clock bindings
> > +  [1] Documentation/devicetree/bindings/clock/clock-bindings.txt
>
> This doesn't add anything as you're adding a yaml binding. I'd drop it
> (and the | from description: since you would no longer have formatting
> to preserve).
>
> > +
> > +properties:
> > +  compatible:
> > +    const: amlogic,t7-clkc
> > +
> > +  reg:
> > +    items:
> > +      - description: basic registers
>
> What does "basic registers" mean? I think you should be more specific in
> your description.
>
> > +      - description: pll registers
> > +      - description: cpu_clk registers
> > +
> > +  reg-names:
> > +    items:
> > +      - const: basic
> > +      - const: pll
> > +      - const: cpu_clk
> > +
> > +  clocks:
> > +    maxItems: 1
> > +
> > +  clock-names:
> > +    const: xtal
> > +
> > +  '#clock-cells':
> > +    const: 1
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - reg-names
> > +  - clocks
> > +  - clock-names
> > +  - '#clock-cells'
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  # Clock controller node:
> > +  - |
> > +    clkc: clock-controller {
>
> The comment above and the node name here can be dropped.
> You do however need to change "clock-controller" to
> "clock-controller@<addr>".
>
> > +        compatible = "amlogic,t7-clkc";
> > +        #clock-cells = <1>;
> > +        reg = <0x0 0x0000 0x00 0x49c>,
> > +              <0x0 0x8000 0x00 0x320>,
> > +              <0x0 0xe040 0x00 0x0bc>;
>
> Drop the 0x0 stuff from here.
>
> > +        reg-names = "basic", "pll", "cpu_clk";
> > +        clocks = <&xtal>;
> > +        clock-names = "xtal";
> > +        status = "okay";
>
> status can be dropped, okay is the default.
>
> Cheers,
> Conor.
>
I will drop this patch for now, wait for the S4 clock driver to be
upstreamed, and use that as a base.