OWL_Tx_CTL
writel(OWL_Tx_CTL_PD, owl_clkevt_base + OWL_Tx_CTL);
writel(0, base + OWL_Tx_CTL);
u32 ctl = readl(base + OWL_Tx_CTL);
writel(ctl, base + OWL_Tx_CTL);
writel(OWL_Tx_CTL_INTEN, base + OWL_Tx_CTL);