linux-kernel - Re: [PATCH v2 1/4] dt-bindings: clock: Add simple-clock-controller

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Message-ID: <c6571a6d-bf55-14b3-102d-814af6763be7@linaro.org>
Date:   Sun, 16 Apr 2023 19:38:38 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     David Yang <mmyangfl@...il.com>, linux-clk@...r.kernel.org
Cc:     devicetree@...r.kernel.org,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Subject: Re: [PATCH v2 1/4] dt-bindings: clock: Add simple-clock-controller

On 16/04/2023 19:32, David Yang wrote:
> Add DT bindings documentation for simple-clock-controller, mutex
> controller for clocks.
> 
> Signed-off-by: David Yang <mmyangfl@...il.com>
> ---
>  .../clock/simple-clock-controller.yaml        | 50 +++++++++++++++++++

Where is the changelog?

>  1 file changed, 50 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/simple-clock-controller.yaml
> 
> diff --git a/Documentation/devicetree/bindings/clock/simple-clock-controller.yaml b/Documentation/devicetree/bindings/clock/simple-clock-controller.yaml
> new file mode 100644
> index 000000000000..17835aeddb1d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/simple-clock-controller.yaml
> @@ -0,0 +1,50 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/simple-clock-controller.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Simple clock controller
> +
> +maintainers:
> +  - David Yang <mmyangfl@...il.com>
> +
> +description: |
> +  Driver (lock provider) for real clocks.

Drop driver references. Typo: clock, not lock.

What is a real clock? What is an unreal clock?

> +
> +  Usually one register controls more than one clocks. This controller avoids
> +  write conflicts by imposing a write lock, so that two operations on the same
> +  register will not happen at the same time.

Interesting. How the clock controller imposes write locks? Aren't you
now mixing drivers and hardware?


> +
> +properties:
> +  compatible:
> +    items:
> +      - oneOf:
> +          - const: simple-clock-controller
> +          - const: simple-clock-reset-controller

Why two?

> +      - const: syscon
> +      - const: simple-mfd

Why do you need syscon and simple-mfd?

> +
> +  reg:
> +    maxItems: 1
> +
> +  '#reset-cells':
> +    const: 2
> +
> +patternProperties:
> +  "clock@.*":

Use consistent quotes.

Anyway, I don't understand what is happening here and why such changes.
Nothing is explained...


Best regards,
Krzysztof