[PATCH] net: Phy: Add PHY lookup support on MDIO bus in case of ACPI probe

[Vikas Singh]

Auto-probe of c45 devices with extended scanning in xgmac_mdio works
well but fails to update device "fwnode" while registering PHYs on
MDIO bus.
This patch is based on https://www.spinics.net/lists/netdev/msg662173.html

This change will update the "fwnode" while PHYs get registered and allow
lookup for registered PHYs on MDIO bus from other drivers while probing.

Signed-off-by: Vikas Singh <vikas.si...@puresoftware.com>
---
 drivers/net/phy/mdio_bus.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 46b3370..7275eff 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -447,8 +447,25 @@ static void of_mdiobus_link_mdiodev(struct mii_bus *bus,
        struct device *dev = &mdiodev->dev;
        struct device_node *child;
 
-       if (dev->of_node || !bus->dev.of_node)
+       if (dev->of_node || !bus->dev.of_node) {
+               /* Checking for acpi node, before returning */
+               struct fwnode_handle *fwnode;
+
+               /* Set the device firmware node to look for child nodes */
+               bus->dev.fwnode = bus->parent->fwnode;
+
+               device_for_each_child_node(&bus->dev, fwnode) {
+                       int addr;
+
+                       if (fwnode_property_read_u32(fwnode, "reg", &addr))
+                               continue;
+                       if (addr == mdiodev->addr) {
+                               dev->fwnode = fwnode;
+                               break;
+                       }
+               }
                return;
+       }
 
        for_each_available_child_of_node(bus->dev.of_node, child) {
                int addr;
-- 
2.7.4