net: zynq_gem: Use shared MDIO bus support for zynqmp

CONFIG_ETH_PHY enables support to utilize generic ethernet phy
framework. Though if ethernet PHY node is in other ethernet node, it
will use shared MDIO to access the PHY of other ethernet.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: T Karthik Reddy <t.karthik.reddy@xilinx.com>
Link: https://lore.kernel.org/r/337b1a38ba36cde1951739af62fb3d2736d97f53.1648631275.git.michal.simek@xilinx.com

diff --git a/drivers/net/zynq_gem.c b/drivers/net/zynq_gem.c
index 3118d1472669e9e10f35b08ac6772329d278817a..168aabbdd0063d52a5f7099ef51684d8a25c795f 100644 (file)
--- a/drivers/net/zynq_gem.c
+++ b/drivers/net/zynq_gem.c
@@ -33,6 +33,7 @@
 #include <linux/bitops.h>
 #include <linux/err.h>
 #include <linux/errno.h>
+#include <eth_phy.h>
 
 /* Bit/mask specification */
 #define ZYNQ_GEM_PHYMNTNC_OP_MASK      0x40020000 /* operation mask bits */
@@ -321,6 +322,9 @@ static int zynq_phy_init(struct udevice *dev)
        /* Enable only MDIO bus */
        writel(ZYNQ_GEM_NWCTRL_MDEN_MASK, &regs_mdio->nwctrl);
 
+       if (IS_ENABLED(CONFIG_DM_ETH_PHY))
+               priv->phyaddr = eth_phy_get_addr(dev);
+
        priv->phydev = phy_connect(priv->bus, priv->phyaddr, dev,
                                   priv->interface);
        if (!priv->phydev)
@@ -771,14 +775,22 @@ static int zynq_gem_probe(struct udevice *dev)
                }
        }
 
-       priv->bus = mdio_alloc();
-       priv->bus->read = zynq_gem_miiphy_read;
-       priv->bus->write = zynq_gem_miiphy_write;
-       priv->bus->priv = priv;
+       if (IS_ENABLED(CONFIG_DM_ETH_PHY))
+               priv->bus = eth_phy_get_mdio_bus(dev);
 
-       ret = mdio_register_seq(priv->bus, dev_seq(dev));
-       if (ret)
-               goto err2;
+       if (!priv->bus) {
+               priv->bus = mdio_alloc();
+               priv->bus->read = zynq_gem_miiphy_read;
+               priv->bus->write = zynq_gem_miiphy_write;
+               priv->bus->priv = priv;
+
+               ret = mdio_register_seq(priv->bus, dev_seq(dev));
+               if (ret)
+                       goto err2;
+       }
+
+       if (IS_ENABLED(CONFIG_DM_ETH_PHY))
+               eth_phy_set_mdio_bus(dev, priv->bus);
 
        ret = zynq_phy_init(dev);
        if (ret)
@@ -841,8 +853,10 @@ static int zynq_gem_of_to_plat(struct udevice *dev)
                ofnode parent;
 
                debug("phy-handle does exist %s\n", dev->name);
-               priv->phyaddr = ofnode_read_u32_default(phandle_args.node,
-                                                       "reg", -1);
+               if (!(IS_ENABLED(CONFIG_DM_ETH_PHY)))
+                       priv->phyaddr = ofnode_read_u32_default
+                                       (phandle_args.node, "reg", -1);
+
                priv->phy_of_node = phandle_args.node;
                priv->max_speed = ofnode_read_u32_default(phandle_args.node,
                                                          "max-speed",