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

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Date:   Fri, 13 Jan 2023 12:17:36 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Keguang Zhang <keguang.zhang@...il.com>, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     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

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.

> 
> 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)?

> +
> +maintainers:
> +  - Keguang Zhang <keguang.zhang@...il.com>
> +
> +properties:

compatible is a first property.

> +  "#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.

> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +required:
> +  - "#clock-cells"
> +  - compatible
> +  - clocks
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    clocks {

No, not really related to the binding.

> +        #address-cells = <1>;
> +        #size-cells = <1>;
> +        ranges;
> +
> +        xtal: xtal {

Incorrect in this context. Missing unit address.

> +            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

> +            compatible = "loongson,ls1b-clk-pll";
> +            #clock-cells = <0>;
> +            clocks = <&xtal>;
> +            reg = <0x1fe78030 0x4>;

compatible is first property, then reg, then the rest.

> +        };
> +
> +        cpu_clk: cpu_clk@...78034 {

No underscores in node names. Anyway this should be gone - make a proper
clock controller.


Best regards,
Krzysztof