linux-kernel - Re: [PATCH 08/15] dt-bindings: clock: Document ma35d1 clock controller bindings

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Date:   Thu, 16 Mar 2023 08:35:49 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Jacky Huang <ychuang570808@...il.com>, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, lee@...nel.org,
        mturquette@...libre.com, sboyd@...nel.org, p.zabel@...gutronix.de,
        gregkh@...uxfoundation.org, jirislaby@...nel.org
Cc:     devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
        schung@...oton.com, Jacky Huang <ychuang3@...oton.com>
Subject: Re: [PATCH 08/15] dt-bindings: clock: Document ma35d1 clock
 controller bindings

On 15/03/2023 08:28, Jacky Huang wrote:
> From: Jacky Huang <ychuang3@...oton.com>
> 
> Add documentation to describe nuvoton ma35d1 clock driver bindings.

Subject: drop second/last, redundant "bindings". The "dt-bindings"
prefix is already stating that these are bindings.

> 
> Signed-off-by: Jacky Huang <ychuang3@...oton.com>
> ---
>  .../bindings/clock/nuvoton,ma35d1-clk.yaml    | 83 +++++++++++++++++++
>  1 file changed, 83 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/nuvoton,ma35d1-clk.yaml
> 
> diff --git a/Documentation/devicetree/bindings/clock/nuvoton,ma35d1-clk.yaml b/Documentation/devicetree/bindings/clock/nuvoton,ma35d1-clk.yaml
> new file mode 100644
> index 000000000000..5c2dea071b38
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/nuvoton,ma35d1-clk.yaml
> @@ -0,0 +1,83 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/nuvoton,ma35d1-clk.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Nuvoton MA35D1 Clock Controller Module Binding
> +
> +maintainers:
> +  - Chi-Fang Li <cfli0@...oton.com>
> +  - Jacky Huang <ychuang3@...oton.com>
> +
> +description: |
> +  The MA35D1 clock controller generates clocks for the whole chip,
> +  including system clocks and all peripheral clocks.
> +
> +  See also:
> +    include/dt-bindings/clock/ma35d1-clk.h
> +
> +properties:
> +  compatible:
> +    items:
> +      - const: nuvoton,ma35d1-clk
> +      - const: syscon
> +
> +  reg:
> +    maxItems: 1
> +
> +  "#clock-cells":
> +    const: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  clock-names:
> +    const: clk_hxt

Drop clock-names. You do not need it for one clock.


> +
> +  assigned-clocks:
> +    maxItems: 5
> +
> +  assigned-clock-rates:
> +    maxItems: 5

Drop both properties, you do not need them in the binding.

> +
> +  nuvoton,pll-mode:
> +    description:
> +      A list of PLL operation mode corresponding to CAPLL, DDRPLL, APLL,
> +      EPLL, and VPLL in sequential. The operation mode value 0 is for
> +      integer mode, 1 is for fractional mode, and 2 is for spread
> +      spectrum mode.
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    maxItems: 5
> +    items:
> +      minimum: 0
> +      maximum: 2

Why exactly this is suitable for DT?

> +
> +  nuvoton,sys:
> +    description:
> +      Phandle to the system management controller.
> +    $ref: "/schemas/types.yaml#/definitions/phandle-array"

Drop quotes.

You need here constraints, look for existing examples.



Best regards,
Krzysztof