Re: [PATCH net-next 08/11] ptp: ocp: Add sysfs attribute utc_tai_offset

+static ssize_t
+utc_tai_offset_show(struct device *dev,
+		    struct device_attribute *attr, char *buf)
+{
+	struct ptp_ocp *bp = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%d\n", bp->utc_tai_offset);
+}
+
+static ssize_t
+utc_tai_offset_store(struct device *dev,
+		     struct device_attribute *attr,
+		     const char *buf, size_t count)
+{
+	struct ptp_ocp *bp = dev_get_drvdata(dev);
+	unsigned long flags;
+	int err;
+	s32 val;
+
+	err = kstrtos32(buf, 0, &val);
+	if (err)
+		return err;
+
+	bp->utc_tai_offset = val;

+	spin_lock_irqsave(&bp->lock, flags);
+	iowrite32(val, &bp->irig_out->adj_sec);
+	iowrite32(val, &bp->dcf_out->adj_sec);
+	spin_unlock_irqrestore(&bp->lock, flags);
+
+	return count;
+}
+static DEVICE_ATTR_RW(utc_tai_offset);