commit b0017987ca8a50f7a681f1f7936c3af2d1b6a2e2
author Michal Simek <michal.simek@xilinx.com> Wed Mar 30 11:07:53 2022 +0200
committer Michal Simek <michal.simek@xilinx.com> Tue Apr 05 15:13:13 2022 +0200
tree 2f138e09ddbcb987387ee0f5205a50ddc87fffd6
parent 6ab01ca1044633f7e2fdc0631b8719b3994bba61

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

drivers/net/zynq_gem.c

diff --git a/drivers/net/zynq_gem.c b/drivers/net/zynq_gem.c
index 3118d14..168aabb 100644
--- 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 @@
 	/* 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 @@
 		}
 	}
 
-	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 @@
 		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",