WCD934X_CDC_SIDETONE_IIR0_IIR_COEF_B2_CTL
b2_reg = WCD934X_CDC_SIDETONE_IIR0_IIR_COEF_B2_CTL + 16 * iir_idx;
int reg = WCD934X_CDC_SIDETONE_IIR0_IIR_COEF_B2_CTL + 16 * iir_idx;