linux-kernel - Re: [PATCH v2 2/2] ARM: dts: kirkwood: Add Ctera C-200 V1 board

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Date:   Tue, 1 Mar 2022 23:04:48 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Paweł Dembicki <paweldembicki@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Olof Johansson <olof@...om.net>, soc@...nel.org,
        Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Corentin Labbe <clabbe@...libre.com>,
        Oleksij Rempel <linux@...pel-privat.de>,
        Hao Fang <fanghao11@...wei.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, linux-kernel@...r.kernel.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 2/2] ARM: dts: kirkwood: Add Ctera C-200 V1 board

On Tue, Mar 1, 2022 at 9:32 PM Paweł Dembicki <paweldembicki@...il.com> wrote:

> It has a fan controlled by the lm63: PWM controller.

Aha it is one of those combo things, sorry for my ignorance.

>  But the fan blows
> only on disks, board temperature won't change even when PWM = 100%.
> It should be controlled by hdd temperature.

We have a way to even monitor the temperature of individual hard disks
these days and I create a thermal zone and use it here to control a fan
in this DTS:
arch/arm/boot/dts/gemini-dlink-dir-685.dts

Yours,
Linus Walleij