[PATCH v4 02/13] net: add of_find_eth_device_by_node() function

[Oleksij Rempel <o.rempel@pengutronix.de>]

For DSA support we need to find MAC node by phandle from the switch port
node. So, provide of_find_eth_device_by_node() to solve this task.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 include/net.h |  1 +
 net/eth.c     | 16 ++++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/include/net.h b/include/net.h
index ca9b6cd61e..8013f79c2e 100644
--- a/include/net.h
+++ b/include/net.h
@@ -97,6 +97,7 @@ int eth_open(struct eth_device *edev);
 void eth_close(struct eth_device *edev);
 int eth_send(struct eth_device *edev, void *packet, int length);	   /* Send a packet		*/
 int eth_rx(void);			/* Check for received packets	*/
+struct eth_device *of_find_eth_device_by_node(struct device_node *np);
 
 /* associate a MAC address to a ethernet device. Should be called by
  * board code for boards which store their MAC address at some unusual
diff --git a/net/eth.c b/net/eth.c
index 762c5dfb8a..e9e53341f3 100644
--- a/net/eth.c
+++ b/net/eth.c
@@ -506,6 +506,22 @@ void led_trigger_network(enum led_trigger trigger)
 	led_trigger(LED_TRIGGER_NET_TXRX, TRIGGER_FLASH);
 }
 
+struct eth_device *of_find_eth_device_by_node(struct device_node *np)
+{
+	struct eth_device *edev;
+	int ret;
+
+	ret = of_device_ensure_probed(np);
+	if (ret)
+		return NULL;
+
+	list_for_each_entry(edev, &netdev_list, list)
+		if (edev->parent->device_node == np)
+			return edev;
+	return NULL;
+}
+EXPORT_SYMBOL(of_find_eth_device_by_node);
+
 static int of_populate_ethaddr(void)
 {
 	char str[sizeof("xx:xx:xx:xx:xx:xx")];
-- 
2.30.2


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