PGS
rcu_pwr_gating_cntl |= PCV(p_c) | PGS(1) | PWR_GATING_EN;
rcu_pwr_gating_cntl |= PCV(p_c) | PGS(4) | PWR_GATING_EN;
rcu_pwr_gating_cntl |= PGS(5) | PWR_GATING_EN;