SM501_GPIO_DATA_LOW
result = smc501_readl(smgpio->regbase + SM501_GPIO_DATA_LOW);
val = smc501_readl(regs + SM501_GPIO_DATA_LOW) & ~bit;
val = smc501_readl(regs + SM501_GPIO_DATA_LOW);
smc501_writel(val, regs + SM501_GPIO_DATA_LOW);
chip->regbase = gpio->regs + SM501_GPIO_DATA_LOW;