CEC_RW_REG
while (readl_relaxed(ao_cec->base + CEC_RW_REG) & CEC_RW_BUS_BUSY) {
writel_relaxed(reg, ao_cec->base + CEC_RW_REG);
readl_relaxed(ao_cec->base + CEC_RW_REG));
writel_relaxed(reg, ao_cec->base + CEC_RW_REG);