CREG_CTRL
sbus_writel(CREG_CTRL_TWAKEUP, bp->creg + CREG_CTRL);
sbus_writel(CREG_CTRL_RESET, cregs + CREG_CTRL);
u32 tmp = sbus_readl(cregs + CREG_CTRL);
sbus_writel(CREG_CTRL_TWAKEUP, qep->qcregs + CREG_CTRL);