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For BF537_FAMILY, when offset != 1, the mask is 1. Thus add proper mask for comparing pfunc with function. Also has small refactor for better readability. In portmux_setup(), it looks odd having "pmux &= ~(3 << 1);" while in current code we do pmux |= (function << offset);. Signed-off-by: Axel Lin <axel.lin@ingics.com> Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>