QUP_ERROR_FLAGS
qup_err = readl(qup->base + QUP_ERROR_FLAGS);
writel(qup_err, qup->base + QUP_ERROR_FLAGS);
qup_err = readl_relaxed(controller->base + QUP_ERROR_FLAGS);
writel_relaxed(qup_err, controller->base + QUP_ERROR_FLAGS);