linux-kernel - Re: [PATCH v9 3/3] iio: adc: add support for Allwinner SoCs ADC

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Date:   Tue, 13 Dec 2016 16:42:10 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Quentin Schulz <quentin.schulz@...e-electrons.com>
Cc:     linux@...linux.org.uk, wens@...e.org, jic23@...nel.org,
        knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net,
        lee.jones@...aro.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
        antoine.tenart@...e-electrons.com,
        thomas.petazzoni@...e-electrons.com
Subject: Re: [PATCH v9 3/3] iio: adc: add support for Allwinner SoCs ADC

On Tue, Dec 13, 2016 at 03:33:32PM +0100, Quentin Schulz wrote:
> The Allwinner SoCs all have an ADC that can also act as a touchscreen
> controller and a thermal sensor. This patch adds the ADC driver which is
> based on the MFD for the same SoCs ADC.
> 
> This also registers the thermal adc channel in the iio map array so
> iio_hwmon could use it without modifying the Device Tree. This registers
> the driver in the thermal framework.
> 
> The thermal sensor requires the IP to be in touchscreen mode to return
> correct values. Therefore, if the user is continuously reading the ADC
> channel(s), the thermal framework in which the thermal sensor is
> registered will switch the IP in touchscreen mode to get a temperature
> value and requires a delay of 100ms (because of the mode switching),
> then the ADC will switch back to ADC mode and requires also a delay of
> 100ms. If the ADC readings are critical to user and the SoC temperature
> is not, this driver is capable of not registering the thermal sensor in
> the thermal framework and thus, "quicken" the ADC readings.
> 
> This driver probes on three different platform_device_id to take into
> account slight differences (registers bit and temperature computation)
> between Allwinner SoCs ADCs.
> 
> Signed-off-by: Quentin Schulz <quentin.schulz@...e-electrons.com>
> Acked-by: Maxime Ripard <maxime.ripard@...e-electrons.com>

I already gave my Acked-by apparently, but I'll say it again :)

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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