??? I2S data from GPIO matrix signal ???

[mbalci]

Hello ,
enum adc_i2s_source_t

Code: Select all

    Values:

    ADC_I2S_DATA_SRC_IO_SIG = 0

        I2S data from GPIO matrix signal

What is the meaning of I2S data from GPIO matrix signal ? in adc.h file ?
What is it for ? Which register's which bit is it?