linux-kernel - Re: [PATCH 0/3] add support for Allwinner SoCs ADC

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Date:	Fri, 1 Jul 2016 11:45:23 +0200
From:	Quentin Schulz <quentin.schulz@...e-electrons.com>
To:	Chen-Yu Tsai <wens@...e.org>
Cc:	jdelvare@...e.com, Guenter Roeck <linux@...ck-us.net>,
	jic23@...nel.org, knaack.h@....de, lars@...afoo.de,
	pmeerw@...erw.net,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Lee Jones <lee.jones@...aro.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-hwmon@...r.kernel.org, linux-iio@...r.kernel.org,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Antoine Ténart <antoine.tenart@...e-electrons.com>
Subject: Re: [PATCH 0/3] add support for Allwinner SoCs ADC

On 29/06/2016 05:28, Chen-Yu Tsai wrote:
> Hi,
> 
> On Tue, Jun 28, 2016 at 4:45 PM, Quentin Schulz
> <quentin.schulz@...e-electrons.com> wrote:
>> The Allwinner SoCs all have an ADC that can also act as a touchscreen controller
>> and a thermal sensor. The first four channels can be used either for the ADC or
>> the touchscreen and the fifth channel is used for the thermal sensor. We
>> currently have a driver for the two latter functions in
>> drivers/input/touchscreen/sun4i-ts.c but we don't have access to the ADC feature
>> at all.
>>
>> This adds initial support for Allwinner SoCs ADC with all features. Yet, the
>> touchscreen is not implemented but will be added later. To switch between
>> touchscreen and ADC modes, you need to poke few bits in registers and
>> (de)activate an interrupt (pen-up).
>> A MFD is provided to let the input driver activate the pen-up interrupt through
>> virtual interrupt, poke few bits via regmap and read data from the ADC driver
>> while both (and iio_hwmon) are probed by the MFD.
> 
> I take it that we are going to replace the original sun4i-ts driver
> with this new mfd one, and various sub device drivers?
> 

Yes, that's the spirit.

[...]

> One thing about iio-hwmon is that it doesn't support hwmon labels.
> Any chance you could improve this, so we see the same names in userspace?

Should be an easy patch: reading datasheet_name from iio_chan_spec of
the iio_channel in iio_hwmon_probe, if none then fall back to current
naming convention.

I don't think it is linked to this serie of patches so I prefer to look
at it later.

Thanks!