ALTR_I2C_CTRL
u32 tmp = readl(idev->base + ALTR_I2C_CTRL);
writel(tmp & ~ALTR_I2C_CTRL_EN, idev->base + ALTR_I2C_CTRL);
u32 tmp = readl(idev->base + ALTR_I2C_CTRL);
writel(tmp | ALTR_I2C_CTRL_EN, idev->base + ALTR_I2C_CTRL);
writel(tmp, idev->base + ALTR_I2C_CTRL);