From mboxrd@z Thu Jan 1 00:00:00 1970 From: maxime.ripard@free-electrons.com (Maxime Ripard) Date: Tue, 13 Dec 2016 16:42:10 +0100 Subject: [PATCH v9 3/3] iio: adc: add support for Allwinner SoCs ADC In-Reply-To: <20161213143332.24988-4-quentin.schulz@free-electrons.com> References: <20161213143332.24988-1-quentin.schulz@free-electrons.com> <20161213143332.24988-4-quentin.schulz@free-electrons.com> Message-ID: <20161213154210.qg5udk6shzj6zyph@lukather> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 > Acked-by: Maxime Ripard 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 -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 801 bytes Desc: not available URL: