default or selected kernelversion does not have config value CONFIG_AD2S1210_GPIO_INPUT.
Result is shown for kernelversion 5.6.18

read resolution from gpio pins

configname: CONFIG_AD2S1210_GPIO_INPUT

Resolution Control
└─>read resolution from gpio pins
In linux kernel since version 2.6.38 (release Date: 2011-03-14)  
GPIO pins are sampling RES0 and RES1 pins, read the resolution
settings from the GPIO pins.