GLOBAL_CONTROL
writel(0x1, idev->base + GLOBAL_CONTROL);
writel(GLOBAL_MST_EN | GLOBAL_SLV_EN, idev->base + GLOBAL_CONTROL);
writel(GLOBAL_MST_EN, idev->base + GLOBAL_CONTROL);
ret = reg_write(priv, REG_GLOBAL, GLOBAL_CONTROL,