stmmac: create of compatible mdio bus for stmmac driver
The DSA driver needs to be passed a reference to an mdio bus. Typically
the mac is configured to use a fixed link but the mdio bus still needs
to be registered so that it con configure the switch.
This patch follows the same process as the altera tse ethernet driver for
creation of the mdio bus.
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Phil Reid <preid@electromag.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/Documentation/devicetree/bindings/net/stmmac.txt b/Documentation/devicetree/bindings/net/stmmac.txt
index f34fc3c..fd5ddf8 100644
--- a/Documentation/devicetree/bindings/net/stmmac.txt
+++ b/Documentation/devicetree/bindings/net/stmmac.txt
@@ -47,6 +47,7 @@
- snps,burst_len: The AXI burst lenth value of the AXI BUS MODE register.
- tx-fifo-depth: See ethernet.txt file in the same directory
- rx-fifo-depth: See ethernet.txt file in the same directory
+- mdio: with compatible = "snps,dwmac-mdio", create and register mdio bus.
Examples:
@@ -65,4 +66,11 @@
tx-fifo-depth = <16384>;
clocks = <&clock>;
clock-names = "stmmaceth";
+ mdio0 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ compatible = "snps,dwmac-mdio";
+ phy1: ethernet-phy@0 {
+ };
+ };
};
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
index bba670c..16c85cc 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
@@ -29,7 +29,7 @@
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
-
+#include <linux/of_mdio.h>
#include <asm/io.h>
#include "stmmac.h"
@@ -200,10 +200,29 @@
struct stmmac_priv *priv = netdev_priv(ndev);
struct stmmac_mdio_bus_data *mdio_bus_data = priv->plat->mdio_bus_data;
int addr, found;
+ struct device_node *mdio_node = NULL;
+ struct device_node *child_node = NULL;
if (!mdio_bus_data)
return 0;
+ if (IS_ENABLED(CONFIG_OF)) {
+ for_each_child_of_node(priv->device->of_node, child_node) {
+ if (of_device_is_compatible(child_node,
+ "snps,dwmac-mdio")) {
+ mdio_node = child_node;
+ break;
+ }
+ }
+
+ if (mdio_node) {
+ netdev_dbg(ndev, "FOUND MDIO subnode\n");
+ } else {
+ netdev_err(ndev, "NO MDIO subnode\n");
+ return 0;
+ }
+ }
+
new_bus = mdiobus_alloc();
if (new_bus == NULL)
return -ENOMEM;
@@ -231,7 +250,8 @@
new_bus->irq = irqlist;
new_bus->phy_mask = mdio_bus_data->phy_mask;
new_bus->parent = priv->device;
- err = mdiobus_register(new_bus);
+
+ err = of_mdiobus_register(new_bus, mdio_node);
if (err != 0) {
pr_err("%s: Cannot register as MDIO bus\n", new_bus->name);
goto bus_register_fail;
@@ -284,7 +304,7 @@
}
}
- if (!found) {
+ if (!found && !mdio_node) {
pr_warn("%s: No PHY found\n", ndev->name);
mdiobus_unregister(new_bus);
mdiobus_free(new_bus);
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index d02691b..6a52fa1 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -146,7 +146,7 @@
if (of_property_read_u32(np, "snps,phy-addr", &plat->phy_addr) == 0)
dev_warn(&pdev->dev, "snps,phy-addr property is deprecated\n");
- if (plat->phy_node || plat->phy_bus_name)
+ if ((plat->phy_node && !of_phy_is_fixed_link(np)) || plat->phy_bus_name)
plat->mdio_bus_data = NULL;
else
plat->mdio_bus_data =