linux-kernel - Re: [PATCH v10 1/3] dt-bindings: pwm: Add binding for Allwinner D1/T113-S3/R329 PWM controller

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Message-ID: <4ioz6f6efs2uhf5mitb4xhebqeryyz5ukple4fkn54wpqep3c4@4ktefld35c3s>
Date: Tue, 29 Oct 2024 09:56:08 +0100
From: Uwe Kleine-König <u.kleine-koenig@...libre.com>
To: Conor Dooley <conor.dooley@...rochip.com>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>
Cc: linux-kernel@...r.kernel.org, Aleksandr Shubin <privatesub2@...il.com>, 
	Chen-Yu Tsai <wens@...e.org>, Jernej Skrabec <jernej.skrabec@...il.com>, 
	Samuel Holland <samuel@...lland.org>, Paul Walmsley <paul.walmsley@...ive.com>, 
	Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
	Philipp Zabel <p.zabel@...gutronix.de>, 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, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v10 1/3] dt-bindings: pwm: Add binding for Allwinner
 D1/T113-S3/R329 PWM controller

Hello,

On Fri, Oct 11, 2024 at 01:27:32PM +0300, Aleksandr Shubin wrote:
> +  allwinner,pwm-channels:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: The number of PWM channels configured for this instance
> +    enum: [6, 9]

I wonder if the number of channels is a property common enough that we
can use "num-pwm-channels" here instead of a vendor specific property.
Or would you suggest a different name? gpio-controller nodes have
"ngpios", so maybe "npwms"?

A quick grep suggests we already have:

	fsl,pwm-number in mxs-pwm.yaml
	st,pwm-num-chan in pwm-st.txt
	snps,pwm-number in snps,dw-apb-timers-pwm2.yaml

As a follow up this could then be used by pwmchip_alloc() to determine
the number of channels if the passed npwm value is 0.

Best regards
Uwe

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