linux-kernel - Re: [PATCH v2 07/15] Documentation: ABI: testing: mt6370: Add ADC sysfs guideline

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Message-ID: <20220618164820.2eeb8ae8@jic23-huawei>
Date:   Sat, 18 Jun 2022 16:48:20 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     ChiaEn Wu <peterwu.pub@...il.com>
Cc:     lars@...afoo.de, matthias.bgg@...il.com, lee.jones@...aro.org,
        daniel.thompson@...aro.org, jingoohan1@...il.com, pavel@....cz,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        linux-iio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-fbdev@...r.kernel.org,
        szunichen@...il.com, ChiaEn Wu <chiaen_wu@...htek.com>
Subject: Re: [PATCH v2 07/15] Documentation: ABI: testing: mt6370: Add ADC
 sysfs guideline

On Mon, 13 Jun 2022 19:11:38 +0800
ChiaEn Wu <peterwu.pub@...il.com> wrote:

> From: ChiaEn Wu <chiaen_wu@...htek.com>
> 
> Add ABI documentation for mt6370 non-standard ADC sysfs interfaces.
> 
> Signed-off-by: ChiaEn Wu <chiaen_wu@...htek.com>
> ---
>  .../ABI/testing/sysfs-bus-iio-adc-mt6370      | 36 +++++++++++++++++++
>  1 file changed, 36 insertions(+)
>  create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-adc-mt6370
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-iio-adc-mt6370 b/Documentation/ABI/testing/sysfs-bus-iio-adc-mt6370
> new file mode 100644
> index 000000000000..039b3381176a
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-bus-iio-adc-mt6370
> @@ -0,0 +1,36 @@
> +What:		/sys/bus/iio/devices/iio:deviceX/in_voltage0_raw

Unfortunately the kernel documentation build scripts do no support duplicating
standard ABI for particular devices so as to provide more information.
Hence you can't have anything in this file.


> +KernelVersion:	5.18
> +Contact:	chiaen_wu@...htek.com
> +Description:
> +		Indicated MT6370 VBUS ADC with lower accuracy(+-75mA)
Curious though, voltage with a mA accuracy range?
This scale should be presented directly to userspace anyway so no need
for this doc.

> +		higher measure range(1~22V)
> +		Calculating with scale returns voltage in uV

No. All channels return in mV. That's the ABI requirement as
in sysfs-bus-iio and we cannot vary if for particular drivers.  If we did
no generic tooling would work.

> +
> +What:		/sys/bus/iio/devices/iio:deviceX/in_voltage1_raw
> +KernelVersion:	5.18
> +Contact:	chiaen_wu@...htek.com
> +Description:
> +		Indicated MT6370 VBUS ADC with higher accuracy(+-30mA)
> +		lower measure range(1~9.76V)
> +		Calculating with scale offset returns voltage in uV
> +
> +What:		/sys/bus/iio/devices/iio:deviceX/in_voltage4_raw
> +KernelVersion:	5.18
> +Contact:	chiaen_wu@...htek.com
> +Description:
> +		Indicated MT6370 TS_BAT ADC
> +		Calculating with scale returns voltage in uV
> +
> +What:		/sys/bus/iio/devices/iio:deviceX/in_voltage7_raw
> +KernelVersion:	5.18
> +Contact:	chiaen_wu@...htek.com
> +Description:
> +		Indicated MT6370 CHG_VDDP ADC
> +		Calculating with scale returns voltage in mV
> +
> +What:		/sys/bus/iio/devices/iio:deviceX/in_temp8_raw
> +KernelVersion:	5.18
> +Contact:	chiaen_wu@...htek.com
> +Description:
> +		Indicated MT6370 IC junction temperature
> +		Calculating with scale and offset returns temperature in degree