[PATCH v5] net: ethernet: nb8800: support fixed-link DT node

[Sebastian Frias <sf84@laposte.net>]

Under some circumstances, for example when connecting
to a switch:

https://stackoverflow.com/questions/31046172/device-tree-for-phy-less-connection-to-a-dsa-switch

the ethernet port will not be connected to a PHY.
In that case a "fixed-link" DT node can be used to replace it.

This patch adds support for the "fixed-link" node to the
nb8800 driver.

Signed-off-by: Sebastian Frias <sf84@laposte.net>
---
  drivers/net/ethernet/aurora/nb8800.c | 14 +++++++++++++-
  1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/aurora/nb8800.c 
b/drivers/net/ethernet/aurora/nb8800.c
index ecc4a33..e1fb071 100644
--- a/drivers/net/ethernet/aurora/nb8800.c
+++ b/drivers/net/ethernet/aurora/nb8800.c
@@ -1460,7 +1460,19 @@ static int nb8800_probe(struct platform_device *pdev)
  		goto err_disable_clk;
  	}

-	priv->phy_node = of_parse_phandle(pdev->dev.of_node, "phy-handle", 0);
+	if (of_phy_is_fixed_link(pdev->dev.of_node)) {
+		ret = of_phy_register_fixed_link(pdev->dev.of_node);
+		if (ret < 0) {
+			dev_err(&pdev->dev, "bad fixed-link spec\n");
+			goto err_free_bus;
+		}
+		priv->phy_node = of_node_get(pdev->dev.of_node);
+	}
+
+	if (!priv->phy_node)
+		priv->phy_node = of_parse_phandle(pdev->dev.of_node,
+						  "phy-handle", 0);
+
  	if (!priv->phy_node) {
  		dev_err(&pdev->dev, "no PHY specified\n");
  		ret = -ENODEV;
-- 
2.1.4