SM501_IRQ_MASK
smc501_writel(0, sm->regs + SM501_IRQ_MASK);
sm501_modify_reg(sm->dev, SM501_IRQ_MASK, 1 << 12, 0);
sm501_modify_reg(sm->dev, SM501_IRQ_MASK, 1 << 13, 0);
sm501_modify_reg(dev->parent, SM501_IRQ_MASK, 1 << 6, 0);
sm501_modify_reg(pdev->dev.parent, SM501_IRQ_MASK, 0, 1 << 6);