[PATCH] net: macb: add phy-handle support for the macb

[Kedareswara rao Appana]

This patch adds support for the 'phy-handle' binding which allows for a
system to specifically select a phy which can be attached via any MDIO
bus available in the system.

Signed-off-by: Kedareswara rao Appana <appa...@xilinx.com>
---
 Documentation/devicetree/bindings/net/macb.txt |  3 +++
 drivers/net/ethernet/cadence/macb.c            | 11 +++++++++--
 drivers/net/ethernet/cadence/macb.h            |  1 +
 3 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/macb.txt 
b/Documentation/devicetree/bindings/net/macb.txt
index b5a42df..3cfff7c 100644
--- a/Documentation/devicetree/bindings/net/macb.txt
+++ b/Documentation/devicetree/bindings/net/macb.txt
@@ -23,6 +23,9 @@ Required properties:
        Optional elements: 'tx_clk'
 - clocks: Phandles to input clocks.
 
+Optional properties:
+- phy-handle   : See ethernet.txt file in the same directory.
+
 Optional properties for PHY child node:
 - reset-gpios : Should specify the gpio for phy reset
 - magic-packet : If present, indicates that the hardware supports waking
diff --git a/drivers/net/ethernet/cadence/macb.c 
b/drivers/net/ethernet/cadence/macb.c
index 6b797e3..4ddd45d 100644
--- a/drivers/net/ethernet/cadence/macb.c
+++ b/drivers/net/ethernet/cadence/macb.c
@@ -421,7 +421,7 @@ static int macb_mii_probe(struct net_device *dev)
 static int macb_mii_init(struct macb *bp)
 {
        struct macb_platform_data *pdata;
-       struct device_node *np;
+       struct device_node *np, *np1;
        int err = -ENXIO, i;
 
        /* Enable management port */
@@ -445,7 +445,13 @@ static int macb_mii_init(struct macb *bp)
        dev_set_drvdata(&bp->dev->dev, bp->mii_bus);
 
        np = bp->pdev->dev.of_node;
-       if (np) {
+       np1 = of_get_parent(bp->phy_node);
+       if (np1) {
+               of_node_put(np1);
+               err = of_mdiobus_register(bp->mii_bus, np1);
+               if (err)
+                       goto err_out_unregister_bus;
+       } else if (np) {
                /* try dt phy registration */
                err = of_mdiobus_register(bp->mii_bus, np);
 
@@ -3016,6 +3022,7 @@ static int macb_probe(struct platform_device *pdev)
        } else {
                bp->phy_interface = err;
        }
+       bp->phy_node = of_parse_phandle(np, "phy-handle", 0);
 
        /* IP specific init */
        err = init(pdev);
diff --git a/drivers/net/ethernet/cadence/macb.h 
b/drivers/net/ethernet/cadence/macb.h
index aa3aeec..83d1617 100644
--- a/drivers/net/ethernet/cadence/macb.h
+++ b/drivers/net/ethernet/cadence/macb.h
@@ -855,6 +855,7 @@ struct macb {
        unsigned int            jumbo_max_len;
 
        u32                     wol;
+       struct device_node      *phy_node;
 };
 
 static inline bool macb_is_gem(struct macb *bp)
-- 
2.1.2