linux-kernel - Re: [PATCH v2 2/2] dt-bindings: hwmon: pwm-fan: add retain-state-shutdown property

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Message-ID: <CAC5umyitFp7oGR-eYXMVaS8bY1AGe3QwEuSPoEz3DxWwH=dUsA@mail.gmail.com>
Date: Mon, 28 Oct 2024 21:42:06 +0900
From: Akinobu Mita <akinobu.mita@...il.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org, 
	devicetree@...r.kernel.org, Jean Delvare <jdelvare@...e.com>, 
	Guenter Roeck <linux@...ck-us.net>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Billy Tsai <billy_tsai@...eedtech.com>
Subject: Re: [PATCH v2 2/2] dt-bindings: hwmon: pwm-fan: add
 retain-state-shutdown property

2024年10月28日(月) 5:38 Krzysztof Kozlowski <krzk@...nel.org>:
>
> On Sat, Oct 26, 2024 at 05:05:35PM +0900, Akinobu Mita wrote:
> > Document new retain-state-shutdown property.
> >
> > Cc: Jean Delvare <jdelvare@...e.com>
> > Cc: Guenter Roeck <linux@...ck-us.net>
> > Cc: Rob Herring <robh@...nel.org>
> > Cc: Krzysztof Kozlowski <krzk+dt@...nel.org>
> > Cc: Conor Dooley <conor+dt@...nel.org>
> > Cc: Billy Tsai <billy_tsai@...eedtech.com>
> > Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
> > ---
> >  Documentation/devicetree/bindings/hwmon/pwm-fan.yaml | 4 ++++
> >  1 file changed, 4 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/hwmon/pwm-fan.yaml b/Documentation/devicetree/bindings/hwmon/pwm-fan.yaml
> > index 4e5abf7580cc..86a069969e29 100644
> > --- a/Documentation/devicetree/bindings/hwmon/pwm-fan.yaml
> > +++ b/Documentation/devicetree/bindings/hwmon/pwm-fan.yaml
> > @@ -40,6 +40,10 @@ properties:
> >      maximum: 4
> >      default: 2
> >
> > +  retain-state-shutdown:
> > +    description: Retain the state of the PWM on shutdown.
>
> You described the desired Linux feature or behavior, not the actual
> hardware. The bindings are about the latter, so instead you need to
> rephrase the property and its description to match actual hardware
> capabilities/features/configuration etc.

Is this description okay?
(Reused the description of retain-state-shutdown in leds-gpio.yaml)

description:
  Retain the state of the PWM on shutdown. Useful in BMC systems, for
  example, when the BMC is rebooted while the host remains up, the fan
  will not stop.