linux-kernel - Re: [PATCH v4 1/2] dt-bindings: hwmon: pwm-fan: Document default-pwm property

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Message-ID: <59991eb8-4052-47e3-b379-a49264093a9e@roeck-us.net>
Date: Sun, 5 Jan 2025 09:22:05 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Rob Herring <robh@...nel.org>, Peter Korsgaard <peter@...sgaard.com>
Cc: devicetree@...r.kernel.org, linux-hwmon@...r.kernel.org,
 Jean Delvare <jdelvare@...e.com>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 1/2] dt-bindings: hwmon: pwm-fan: Document default-pwm
 property

On 1/3/25 11:58, Rob Herring wrote:

> 
> But RPM is ultimately what you care about and is the fan parameter
> that's universal yet independent of the underlying control. RPM is what
> determines noise and power consumption.
> 

I forgot to add: I would argue that airflow restrictions play a substantial
role for both power consumption and noise, especially when trying to achieve
a specific fan speed. For power consumption, I don't even see how rpm would
play a substantial role in the first place since power consumption depends
on pwm, not on the resulting rpm (or airflow).

Guenter