Aries boards have a GP2A light/proximity sensor attached over i2c-gpio.
As the chip outputs a current and the board has no current ADC, a
current shunt resistor and a voltage ADC are used.
Signed-off-by: Jonathan Bakker <xc-racer2@live.ca>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>