[PATCH] ARM: Add hwmon driver for LRADC found on Allwinner A13/A20 SoCs

[Ruslan Zalata <rz@fabmicro.ru>]

Hi Guenter.

sun4i-gpadc-iio.c uses built-in four-channel ADC that is dedicated to 
RTP (resistive touch panel). It also can be used as a general purpose 
10-bit ADC, but it's a different piece of hardware inside SoC along with 
LRADC.

---
Regards,
Ruslan.

Fabmicro, LLC.

On 2022-04-28 02:07, Guenter Roeck wrote:
> On 4/27/22 13:23, Jernej Škrabec wrote:
>> Hi Ruslan!
>> 
>> Dne sreda, 27. april 2022 ob 21:25:12 CEST je Ruslan Zalata 
>> napisal(a):
>>> Some Allwinner SoCs like A13, A20 or T2 are equipped with two-channel
>>> low rate (6 bit) ADC that is often used for extra keys. There's a 
>>> driver
>>> for that already implementing standard input device, but it has these
>>> limitations: 1) it cannot be used for general ADC data equisition, 
>>> and
>>> 2) it uses only one LRADC channel of two available.
>>> 
>>> This driver provides basic hwmon interface to both channels of LRADC 
>>> on
>>> such Allwinner SoCs.
>>> 
>>> Signed-off-by: Ruslan Zalata <rz@fabmicro.ru>
>> 
>> Before even going to check actual driver, please read 
>> https://www.kernel.org/
>> doc/html/latest/process/submitting-patches.html in detail.
>> 
>> Just few basic things to fix first:
>> 1. subject doesn't conform to rules
>> 2. send patch to maintainers and mailing lists (use 
>> scripts/get_maintainer.pl)
> 
> I only got the copy sent directly to me. Anyway, how is this different 
> to
> the driver in drivers/iio/adc/sun4i-gpadc-iio.c ?
> 
> Guenter