netdev/phy/of: Handle IEEE802.3 clause 45 Ethernet PHYs in of_mdiobus_register()

Define two new "compatible" values for Ethernet
PHYs. "ethernet-phy-ieee802.3-c22" and "ethernet-phy-ieee802.3-c45"
are used to indicate a PHY uses the corresponding protocol.

If a PHY is "compatible" with "ethernet-phy-ieee802.3-c45", we
indicate this so that get_phy_device() can properly probe the device.

If get_phy_device() fails, it was probably due to failing the probe of
the PHY identifier registers.  Since we have the device tree telling
us the PHY exists, go ahead and add it anyhow with a phy_id of zero.
There may be a driver match based on the "compatible" property.

Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 23 insertions, 5 deletions

diff --git a/Documentation/devicetree/bindings/net/phy.txt b/Documentation/devicetree/bindings/net/phy.txt
index bb8c742eb8c5..7cd18fbfcf71 100644
--- a/Documentation/devicetree/bindings/net/phy.txt
+++ b/Documentation/devicetree/bindings/net/phy.txt
@@ -14,10 +14,20 @@ Required properties:
  - linux,phandle :  phandle for this node; likely referenced by an
    ethernet controller node.
 
+Optional Properties:
+
+- compatible: Compatible list, may contain
+  "ethernet-phy-ieee802.3-c22" or "ethernet-phy-ieee802.3-c45" for
+  PHYs that implement IEEE802.3 clause 22 or IEEE802.3 clause 45
+  specifications. If neither of these are specified, the default is to
+  assume clause 22. The compatible list may also contain other
+  elements.
+
 Example:
 
 ethernet-phy@0 {
-        linux,phandle = <2452000>
+        compatible = "ethernet-phy-ieee802.3-c22";
+        linux,phandle = <2452000>;
         interrupt-parent = <40000>;
         interrupts = <35 1>;
         reg = <0>;
diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
index 6c24cad322df..8e6c25f35040 100644
--- a/drivers/of/of_mdio.c
+++ b/drivers/of/of_mdio.c
@@ -57,6 +57,7 @@ int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
                 const __be32 *paddr;
                 u32 addr;
                 int len;
+                bool is_c45;
 
                 /* A PHY must have a reg property in the range [0-31] */
                 paddr = of_get_property(child, "reg", &len);
@@ -79,11 +80,18 @@ int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
                                 mdio->irq[addr] = PHY_POLL;
                 }
 
-                phy = get_phy_device(mdio, addr, false);
+                is_c45 = of_device_is_compatible(child,
+                                                 "ethernet-phy-ieee802.3-c45");
+                phy = get_phy_device(mdio, addr, is_c45);
+
                 if (!phy || IS_ERR(phy)) {
-                        dev_err(&mdio->dev, "error probing PHY at address %i\n",
-                                addr);
-                        continue;
+                        phy = phy_device_create(mdio, addr, 0, false, NULL);
+                        if (!phy || IS_ERR(phy)) {
+                                dev_err(&mdio->dev,
+                                        "error creating PHY at address %i\n",
+                                        addr);
+                                continue;
+                        }
                 }
 
                 /* Associate the OF node with the device structure so it