linux-kernel - Re: [PATCH 5/5] dt-bindings: pwm: sun20i: Add options to select a clock source and DIV

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Date: Fri, 31 May 2024 16:43:34 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Hironori KIKUCHI <kikuchan98@...il.com>, linux-kernel@...r.kernel.org
Cc: Uwe Kleine-König <ukleinek@...nel.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
 Jernej Skrabec <jernej.skrabec@...il.com>,
 Samuel Holland <samuel@...lland.org>,
 Aleksandr Shubin <privatesub2@...il.com>, Cheo Fusi
 <fusibrandon13@...il.com>, linux-pwm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH 5/5] dt-bindings: pwm: sun20i: Add options to select a
 clock source and DIV_M

On 31/05/2024 16:11, Hironori KIKUCHI wrote:
> This patch adds new options to select a clock source and DIV_M register
> value for each coupled PWM channels.

Please do not use "This commit/patch/change", but imperative mood. See
longer explanation here:
https://elixir.bootlin.com/linux/v5.17.1/source/Documentation/process/submitting-patches.rst#L95

Bindings are before their users. This should not be last patch, because
this implies there is no user.

This applies to all variants? Or the one you add? Confused...

> 
> Signed-off-by: Hironori KIKUCHI <kikuchan98@...il.com>
> ---
>  .../bindings/pwm/allwinner,sun20i-pwm.yaml    | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/pwm/allwinner,sun20i-pwm.yaml b/Documentation/devicetree/bindings/pwm/allwinner,sun20i-pwm.yaml
> index b9b6d7e7c87..436a1d344ab 100644
> --- a/Documentation/devicetree/bindings/pwm/allwinner,sun20i-pwm.yaml
> +++ b/Documentation/devicetree/bindings/pwm/allwinner,sun20i-pwm.yaml
> @@ -45,6 +45,25 @@ properties:
>      description: The number of PWM channels configured for this instance
>      enum: [6, 9]
>  
> +  allwinner,pwm-pair-clock-sources:
> +    description: The clock source names for each PWM pair
> +    items:
> +      enum: [hosc, apb]
> +    minItems: 1
> +    maxItems: 8

Missing type... and add 8 of such items to your example to make it complete.

> +
> +  allwinner,pwm-pair-clock-prescales:
> +    description: The prescale (DIV_M register) values for each PWM pair
> +    $ref: /schemas/types.yaml#/definitions/uint32-matrix
> +    items:
> +      items:
> +        minimum: 0
> +        maximum: 8
> +      minItems: 1
> +      maxItems: 1
> +    minItems: 1
> +    maxItems: 8

This does not look like matrix but array.

Why clock DIV cannot be deduced from typical PWM attributes + clock
frequency?

Best regards,
Krzysztof