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SubjectRe: [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@gmail.com> wrote:

> From: ChiaEn Wu <chiaen_wu@richtek.com>
>
> Add ABI documentation for mt6370 non-standard ADC sysfs interfaces.
>
> Signed-off-by: ChiaEn Wu <chiaen_wu@richtek.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@richtek.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@richtek.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@richtek.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@richtek.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@richtek.com
> +Description:
> + Indicated MT6370 IC junction temperature
> + Calculating with scale and offset returns temperature in degree

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