default or selected kernelversion does not have config value CONFIG_AD2S1210_GPIO_OUTPUT.
Result is shown for kernelversion 5.6.18

set gpio pins to set resolution

configname: CONFIG_AD2S1210_GPIO_OUTPUT

Resolution Control
└─>set gpio pins to set resolution
In linux kernel since version 2.6.38 (release Date: 2011-03-14)  
RES0 and RES1 pins are controlled by GPIOs, setting GPIO pins to
set the resolution.