[PATCH 5/5] net: stmmac: Use acpi_mdiobus_register() for ACPI based system

[Kai-Heng Feng]

Child nodes of stmmac ACPI node may have additional properties that the
PHY layer can use.

To achieve that, use acpi_mdiobus_register() to find PHY nodes
references via "phy-handle", so the properties of PHY nodes can be used
by the PHY layer.

Signed-off-by: Kai-Heng Feng <kai.heng.feng at canonical.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
index a5d150c5f3d8c..37cebd8f2ec5c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
@@ -10,6 +10,8 @@
   Maintainer: Giuseppe Cavallaro <peppe.cavallaro at st.com>
 *******************************************************************************/
 
+#include <linux/acpi.h>
+#include <linux/acpi_mdio.h>
 #include <linux/gpio/consumer.h>
 #include <linux/io.h>
 #include <linux/iopoll.h>
@@ -445,6 +447,7 @@ int stmmac_mdio_register(struct net_device *ndev)
 	struct stmmac_mdio_bus_data *mdio_bus_data = priv->plat->mdio_bus_data;
 	struct device_node *mdio_node = priv->plat->mdio_node;
 	struct device *dev = ndev->dev.parent;
+	struct fwnode_handle *fwnode = dev->fwnode;
 	int addr, found, max_addr;
 
 	if (!mdio_bus_data)
@@ -488,7 +491,10 @@ int stmmac_mdio_register(struct net_device *ndev)
 	new_bus->phy_mask = mdio_bus_data->phy_mask;
 	new_bus->parent = priv->device;
 
-	err = of_mdiobus_register(new_bus, mdio_node);
+	if (is_acpi_node(fwnode))
+		err = acpi_mdiobus_register(new_bus, fwnode);
+	else
+		err = of_mdiobus_register(new_bus, mdio_node);
 	if (err != 0) {
 		dev_err(dev, "Cannot register the MDIO bus\n");
 		goto bus_register_fail;
-- 
2.34.1