net: xilinx: axi_emac: Use shared MDIO bus support for axi emac driver

CONFIG_DM_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. Move ethernet
print info statement from plat function to probe function, as phyaddr is
not enumerated when CONFIG_DM_ETH_PHY is enabled.

Signed-off-by: T Karthik Reddy <t.karthik.reddy@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
Acked-by: Ashok Reddy Soma <ashok.reddy.soma@xilinx.com>
Link: https://lore.kernel.org/r/ecfec78234233fefdc172c141c207b2d78ef70c5.1652181968.git.michal.simek@amd.com

diff --git a/drivers/net/xilinx_axi_emac.c b/drivers/net/xilinx_axi_emac.c
index a471573..04277b1 100644 (file)
--- a/drivers/net/xilinx_axi_emac.c
+++ b/drivers/net/xilinx_axi_emac.c
@@ -19,6 +19,7 @@
 #include <miiphy.h>
 #include <wait_bit.h>
 #include <linux/delay.h>
+#include <eth_phy.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -295,6 +296,9 @@ static int axiemac_phy_init(struct udevice *dev)
        /* Set default MDIO divisor */
        writel(XAE_MDIO_DIV_DFT | XAE_MDIO_MC_MDIOEN_MASK, &regs->mdio_mc);
 
+       if (IS_ENABLED(CONFIG_DM_ETH_PHY))
+               priv->phyaddr = eth_phy_get_addr(dev);
+
        if (priv->phyaddr == -1) {
                /* Detect the PHY address */
                for (i = 31; i >= 0; i--) {
@@ -778,18 +782,29 @@ static int axi_emac_probe(struct udevice *dev)
                priv->phy_of_handle = plat->phy_of_handle;
                priv->interface = pdata->phy_interface;
 
-               priv->bus = mdio_alloc();
-               priv->bus->read = axiemac_miiphy_read;
-               priv->bus->write = axiemac_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)
-                       return ret;
+               if (!priv->bus) {
+                       priv->bus = mdio_alloc();
+                       priv->bus->read = axiemac_miiphy_read;
+                       priv->bus->write = axiemac_miiphy_write;
+                       priv->bus->priv = priv;
+
+                       ret = mdio_register_seq(priv->bus, dev_seq(dev));
+                       if (ret)
+                               return ret;
+               }
+
+               if (IS_ENABLED(CONFIG_DM_ETH_PHY))
+                       eth_phy_set_mdio_bus(dev, priv->bus);
 
                axiemac_phy_init(dev);
        }
 
+       printf("AXI EMAC: %lx, phyaddr %d, interface %s\n", (ulong)pdata->iobase,
+              priv->phyaddr, phy_string_for_interface(pdata->phy_interface));
+
        return 0;
 }
 
@@ -844,8 +859,10 @@ static int axi_emac_of_to_plat(struct udevice *dev)
                offset = fdtdec_lookup_phandle(gd->fdt_blob, node,
                                               "phy-handle");
                if (offset > 0) {
-                       plat->phyaddr = fdtdec_get_int(gd->fdt_blob, offset,
-                                                      "reg", -1);
+                       if (!(IS_ENABLED(CONFIG_DM_ETH_PHY)))
+                               plat->phyaddr = fdtdec_get_int(gd->fdt_blob,
+                                                              offset,
+                                                              "reg", -1);
                        plat->phy_of_handle = offset;
                }
 
@@ -857,9 +874,6 @@ static int axi_emac_of_to_plat(struct udevice *dev)
                                                     "xlnx,eth-hasnobuf");
        }
 
-       printf("AXI EMAC: %lx, phyaddr %d, interface %s\n", (ulong)pdata->iobase,
-              plat->phyaddr, phy_string_for_interface(pdata->phy_interface));
-
        return 0;
 }