linux-kernel - Re: [PATCH v4 1/1] iio: mtk-auxadc: fix case IIO_CHAN_INFO_PROCESSED

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Message-ID: <CAJMQK-hDN3xOTU0gcmDWaOKRwPk_h0E7=6nok45mrU3RvgbcHw@mail.gmail.com>
Date:   Mon, 1 Nov 2021 00:49:26 +0800
From:   Hsin-Yi Wang <hsinyi@...omium.org>
To:     Hui-Liu Liu <hui.liu@...iatek.com>
Cc:     robh+dt@...nel.org, lars@...afoo.de, pmeerw@...erw.net,
        srv_heupstream@...iatek.com, zhiyong.tao@...iatek.com,
        chun-hung.wu@...iatek.com, yingjoe.chen@...iatek.com,
        seiya.wang@...iatek.com, ben.tseng@...iatek.com,
        matthias.bgg@...il.com, s.hauer@...gutronix.de,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-iio@...r.kernel.org,
        linux-mediatek@...ts.infradead.org,
        Jonathan Cameron <jic23@...nel.org>
Subject: Re: [PATCH v4 1/1] iio: mtk-auxadc: fix case IIO_CHAN_INFO_PROCESSED

On Sun, Sep 26, 2021 at 7:26 PM Jonathan Cameron <jic23@...nel.org> wrote:
>
> On Sun, 26 Sep 2021 15:30:28 +0800
> Hui-Liu Liu <hui.liu@...iatek.com> wrote:
>
> > From: Hui Liu <hui.liu@...iatek.com>
> >
> > The previous driver does't apply the necessary scaling to take the
> > voltage range into account.
> > We change readback value from raw data to input voltage to fix case
> > IIO_CHAN_INFO_PROCESSED.
> >
> > Fixes: ace4cdfe67be ("iio: adc: mt2701: Add Mediatek auxadc driver for mt2701.")
> > Signed-off-by: Hui Liu <hui.liu@...iatek.com>
>
Hi Hui Liu,

After this patch, mt8183 tboard thermal sensor[1] is getting incorrect value:
Before the patch:
/sys/class/thermal/thermal_zone0/temp:41488 (cpu)
/sys/class/thermal/thermal_zone7/temp:35433 (tboard)
/sys/class/thermal/thermal_zone8/temp:33709 (tboard)

After the patch:
/sys/class/thermal/thermal_zone0/temp:40365 (cpu)
/sys/class/thermal/thermal_zone7/temp:69781 (tboard)
/sys/class/thermal/thermal_zone8/temp:69014 (tboard)

[1] https://elixir.bootlin.com/linux/v5.15-rc7/source/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi#L862

>
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> Linux-mediatek mailing list
> Linux-mediatek@...ts.infradead.org
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