ixCG_CLKPIN_CNTL
orig = data = RREG32_SMC(ixCG_CLKPIN_CNTL);
WREG32_SMC(ixCG_CLKPIN_CNTL, data);
if (RREG32_SMC(ixCG_CLKPIN_CNTL) & CG_CLKPIN_CNTL__XTALIN_DIVIDE_MASK)
tmp = RREG32_SMC(ixCG_CLKPIN_CNTL);