[PATCH v2 2/4] netdev/phy/of: Handle IEEE802.3 clause 45 Ethernet PHYs in of_mdiobus_register()

[David Daney <ddaney.cavm@gmail.com>]

From: David Daney <david.daney@cavium.com>

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>
---
 Documentation/devicetree/bindings/net/phy.txt |   12 +++++++++++-
 drivers/of/of_mdio.c                          |   16 ++++++++++++----
 2 files changed, 23 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/phy.txt 
b/Documentation/devicetree/bindings/net/phy.txt
index bb8c742..7cd18fb 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 6c24cad..8e6c25f 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
-- 
1.7.2.3