Could DragonBoard 410C GPIO0 output 2.4MHZ clock?

Hello,
I’m trying to output the clock between 2MHZ~3MHZ on GPIO0(UART0-TX) with Debian 17.04. But I could only get 1.19MHZ 3.2MHZ by modify DMIC_B1_CTL_DMIC0_CLK_SEL_DIVx in msm8916-wcd-digital.c. I cannot get the clock between 2MHZ and 3MHZ, could somebody help me?