EMC_BGBIAS_CTL0
val = readl(emc->regs + EMC_BGBIAS_CTL0);
writel(val2, emc->regs + EMC_BGBIAS_CTL0);
writel(val, emc->regs + EMC_BGBIAS_CTL0);
readl(emc->regs + EMC_BGBIAS_CTL0) !=
emc->regs + EMC_BGBIAS_CTL0);