linux-kernel - Re: [PATCH v3 2/2] Documentation: ABI: testing: mt6360: Add ADC sysfs guideline

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Date:   Sat, 29 Aug 2020 18:15:22 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Gene Chen <gene.chen.richtek@...il.com>
Cc:     matthias.bgg@...il.com, knaack.h@....de, lars@...afoo.de,
        pmeerw@...erw.net, linux-iio@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        gene_chen@...htek.com, Wilma.Wu@...iatek.com,
        shufan_lee@...htek.com, cy_huang@...htek.com,
        benjamin.chao@...iatek.com
Subject: Re: [PATCH v3 2/2] Documentation: ABI: testing: mt6360: Add ADC
 sysfs guideline

On Mon, 24 Aug 2020 17:06:25 +0800
Gene Chen <gene.chen.richtek@...il.com> wrote:

> From: Gene Chen <gene_chen@...htek.com>
> 
> Add ABI documentation for mt6360 ADC sysfs interfaces.

Please check this.  The actual filenames don't look correct
to me.

> 
> Signed-off-by: Gene Chen <gene_chen@...htek.com>
> ---
>  Documentation/ABI/testing/sysfs-bus-iio-adc-mt6360 | 83 ++++++++++++++++++++++
>  1 file changed, 83 insertions(+)
>  create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-adc-mt6360
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-iio-adc-mt6360 b/Documentation/ABI/testing/sysfs-bus-iio-adc-mt6360
> new file mode 100644
> index 0000000..9dab17e
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-bus-iio-adc-mt6360
> @@ -0,0 +1,83 @@
> +What:		/sys/bus/iio/devices/iio:deviceX/usbid_input
> +KernelVersion:	5.8.0
> +Contact:	gene_chen@...htek.com
> +Description:
> +		Indicated MT6360 USBID ADC
Can we give a bit of text saying what that is?

It's nice if people writing userspace software looking at this don't have
to go find the datasheet just to give a human readable description of the
channel.

> +		Reading returns current voltage in uV
drop _current_ as that's a bit confusing :)

Reading returns voltage in uV

> +
> +What:		/sys/bus/iio/devices/iio:deviceX/vbusdiv5_input
> +KernelVersion:	5.8.0
> +Contact:	gene_chen@...htek.com
> +Description:
> +		Indicated MT6360 VBUS ADC with high accuracy
> +		Reading returns current voltage in uV

Is this measuring output of a regulator which has taken vbus and divided
it by 5?  I'm rather confused.

> +
> +What:		/sys/bus/iio/devices/iio:deviceX/vbusdiv2_input
> +KernelVersion:	5.8.0
> +Contact:	gene_chen@...htek.com
> +Description:
> +		Indicated MT6360 VBUS ADC with low accuracy
> +		Reading returns current voltage in uV
> +
> +What:		/sys/bus/iio/devices/iio:deviceX/vsys_input
> +KernelVersion:	5.8.0
> +Contact:	gene_chen@...htek.com
> +Description:
> +		Indicated MT6360 VSYS ADC
> +		Reading returns current voltage in uV
> +
> +What:		/sys/bus/iio/devices/iio:deviceX/vbat_input
> +KernelVersion:	5.8.0
> +Contact:	gene_chen@...htek.com
> +Description:
> +		Indicated MT6360 VBAT ADC
> +		Reading returns current voltage in uV
> +
> +What:		/sys/bus/iio/devices/iio:deviceX/ibus_input
> +KernelVersion:	5.8.0
> +Contact:	gene_chen@...htek.com
> +Description:
> +		Indicated MT6360 IBUS ADC
> +		Reading returns current in uA
> +
> +What:		/sys/bus/iio/devices/iio:deviceX/ibat_input
> +KernelVersion:	5.8.0
> +Contact:	gene_chen@...htek.com
> +Description:
> +		Indicated MT6360 IBAT ADC
> +		Reading returns current in uA
> +
> +What:		/sys/bus/iio/devices/iio:deviceX/chg_vddp_input
> +KernelVersion:	5.8.0
> +Contact:	gene_chen@...htek.com
> +Description:
> +		Indicated MT6360 CHG_VDDP ADC
> +		Reading returns current voltage in uV
> +
> +What:		/sys/bus/iio/devices/iio:deviceX/temp_jc_input
> +KernelVersion:	5.8.0
> +Contact:	gene_chen@...htek.com
> +Description:
> +		Indicated MT6360 IC junction temperature
> +		Reading returns current temperature in degree
> +
> +What:		/sys/bus/iio/devices/iio:deviceX/vref_ts_input
> +KernelVersion:	5.8.0
> +Contact:	gene_chen@...htek.com
> +Description:
> +		Indicated MT6360 VREF_TS ADC
> +		Reading returns current voltage in uV
> +
> +What:		/sys/bus/iio/devices/iio:deviceX/ts_input
> +KernelVersion:	5.8.0
> +Contact:	gene_chen@...htek.com
> +Description:
> +		Indicated MT6360 TS ADC
> +		Reading returns current voltage in uV
> +
> +What:		/sys/bus/iio/devices/iio:deviceX/timestamp
> +KernelVersion:	5.8.0
> +Contact:	gene_chen@...htek.com
> +Description:
> +		Indicated MT6360 timestamp
> +		Reading returns current timestamp in ms