ALTR_I2C_ISR
u32 int_en = readl(idev->base + ALTR_I2C_ISR);
writel(int_en | mask, idev->base + ALTR_I2C_ISR);
idev->isr_status = readl(idev->base + ALTR_I2C_ISR) & idev->isr_mask;