pmu_set
.active = pmu_active, .regset_get = pmu_get, .set = pmu_set
static bool is_pmu_set(struct ath_hw *ah, u32 pmu_reg, int pmu_set)
while (pmu_set != REG_READ(ah, pmu_reg)) {
REG_WRITE(ah, pmu_reg, pmu_set);