linux-kernel - Re: [PATCH v2 1/2] hwmon: (pwm-fan) add option to leave fan on shutdown

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Message-ID: <CAC5umyjtCaYPjtgDnJ69c87w825MFSHgm92JA1kWORwP4Hdjww@mail.gmail.com>
Date: Wed, 30 Oct 2024 23:55:07 +0900
From: Akinobu Mita <akinobu.mita@...il.com>
To: Billy Tsai <billy_tsai@...eedtech.com>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, 
	"linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>, 
	"devicetree@...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>
Subject: Re: [PATCH v2 1/2] hwmon: (pwm-fan) add option to leave fan on shutdown

2024年10月29日(火) 11:35 Billy Tsai <billy_tsai@...eedtech.com>:
>
> > This adds an optional property "retain-state-shutdown" as requested by
> > Billy Tsai.
>
> > Billy said:
> >  "Our platform is BMC that will use a PWM-FAN driver to control the fan
> >  on the managed host. In our case, we do not want to stop the fan when
> >  the BMC is reboot, which may cause the temperature of the managed host
> >  not to be lowered."
>
> I confirmed that it works properly.
>
> Reviewed-by: Billy Tsai <billy_tsai@...eedtech.com>
> Tested-by: Billy Tsai <billy_tsai@...eedtech.com>

Thank you very much for testing.
However, I plan to change this option to device attribute
(/sys/class/hwmon/hwmonX/retain-state-shutdown) instead of the device tree.