iio: adc: at91-sama5d2_adc: add support for suspend/resume functionality
Added support for suspend/resume functionality for the ADC IP in sama5d2 SoC. In order to enter Suspend to ram mode (backup + self refresh mode for memory), in which the ADC IP is no longer powered, we need to reset the pins to default state, for the scenario when they are also used for I2C bus to communicate with the PMIC. On resume, we need to reconfigure the ADC IP registers and reconfigure the trigger registers in the case when the suspend procedure is done while sysfs has the buffer and trigger enabled. In the case the suspend happens exactly during a software triggered conversion, the request will time out, because we reset and power down the ADC. Signed-off-by: NEugen Hristev <eugen.hristev@microchip.com> Signed-off-by: NJonathan Cameron <jic23@kernel.org>
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