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Date: Sat, 12 Mar 2016 00:08:46 +0100
From: Andrew Lunn <andrew@...n.ch>
To: netdev <netdev@...r.kernel.org>,
Florian Fainelli <f.fainelli@...il.com>
Cc: Andrew Lunn <andrew@...n.ch>
Subject: [RFC PATCH net-next 2/2] phy: fixed-phy: Allow DT description of an MDIO bus and PHYs.
Not all MACs are connected to PHYs. They can for example be connected
to a switch. Using the fixed PHY properties with the MAC is possible,
but requires support in the MAC. It is however simpler to make use of
the phy-handle property to point to a PHY. To achieve this, the PHY
must be in the device tree.
Allow virtual MDIO busses to be represented in device tree, which
contains virtual fixed-phys.
Signed-off-by: Andrew Lunn <andrew@...n.ch>
---
.../devicetree/bindings/net/fixed-link.txt | 39 +++++++
drivers/net/phy/fixed_phy.c | 122 ++++++++++++++++++++-
2 files changed, 157 insertions(+), 4 deletions(-)
diff --git a/Documentation/devicetree/bindings/net/fixed-link.txt b/Documentation/devicetree/bindings/net/fixed-link.txt
index ec5d889fe3d8..2a22b92007fa 100644
--- a/Documentation/devicetree/bindings/net/fixed-link.txt
+++ b/Documentation/devicetree/bindings/net/fixed-link.txt
@@ -52,3 +52,42 @@ ethernet@1 {
};
...
};
+
+Fixed link PHYs on an MDIO bus
+------------------------------
+
+An alternative to using the fixed link properties in the MAC is to
+define an MDIO bus with a number of fixed link phys on it.
+
+Required properties:
+- compatible = ""linux,mdio-fixed-phy";
+- #address-cells = <1>;
+- #size-cells = <0>;
+
+Child nodes represent PHYs on this mdio bus. Standard properties for
+fixed links, 'speed', 'full-duplex', 'pause', 'asym-pause',
+'link-gpios', as defined above are used. Additionally a 'reg' property
+is required for the address of the PHY on the bus. This should be of
+value 0 to 31.
+
+Example
+-------
+
+mdio {
+ compatible = "linux,mdio-fixed-phy";
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ phy0: phy@0 {
+ reg = <0>;
+ speed = <1000>;
+ pause;
+ link-gpios = <&gpio0 12 GPIO_ACTIVE_HIGH>;
+ };
+
+ phy1: phy@8 {
+ reg = <8>;
+ speed = <100>;
+ full-duplex;
+ };
+};
diff --git a/drivers/net/phy/fixed_phy.c b/drivers/net/phy/fixed_phy.c
index fc07a8866020..4df2fcdcee68 100644
--- a/drivers/net/phy/fixed_phy.c
+++ b/drivers/net/phy/fixed_phy.c
@@ -22,6 +22,8 @@
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_mdio.h>
#include <linux/gpio.h>
#define MII_REGS_NUM 29
@@ -241,12 +243,12 @@ int fixed_phy_update_state(struct phy_device *phydev,
}
EXPORT_SYMBOL(fixed_phy_update_state);
-int fixed_phy_add(unsigned int irq, int phy_addr,
- struct fixed_phy_status *status,
- int link_gpio)
+int fixed_phy_add_fmb(struct fixed_mdio_bus *fmb,
+ unsigned int irq, int phy_addr,
+ struct fixed_phy_status *status,
+ int link_gpio)
{
int ret;
- struct fixed_mdio_bus *fmb = &platform_fmb;
struct fixed_phy *fp;
fp = kzalloc(sizeof(*fp), GFP_KERNEL);
@@ -283,6 +285,14 @@ err_regs:
kfree(fp);
return ret;
}
+
+int fixed_phy_add(unsigned int irq, int phy_addr,
+ struct fixed_phy_status *status,
+ int link_gpio)
+{
+ return fixed_phy_add_fmb(&platform_fmb, irq, phy_addr, status,
+ link_gpio);
+}
EXPORT_SYMBOL_GPL(fixed_phy_add);
static void fixed_phy_del(int phy_addr)
@@ -378,6 +388,103 @@ void fixed_phy_unregister(struct phy_device *phy)
}
EXPORT_SYMBOL_GPL(fixed_phy_unregister);
+static int mdio_fixed_phy_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct fixed_phy_status status;
+ struct fixed_mdio_bus *fmb;
+ struct device_node *child;
+ struct mii_bus *bus;
+ int phy_addr, irq;
+ int link_gpio;
+
+ int ret;
+
+ if (!np)
+ return -EINVAL;
+
+ bus = mdiobus_alloc_size(sizeof(*fmb));
+ if (!bus)
+ return -ENOMEM;
+
+ if (strlen(pdev->name) >= MII_BUS_ID_SIZE)
+ return -EINVAL;
+
+ strncpy(bus->id, pdev->name, MII_BUS_ID_SIZE - 1);
+ bus->name = bus->id;
+ bus->parent = &pdev->dev;
+ bus->read = fixed_mdio_read;
+ bus->write = fixed_mdio_write;
+ fmb = bus->priv;
+ fmb->mii_bus = bus;
+ INIT_LIST_HEAD(&fmb->phys);
+
+ for_each_available_child_of_node(np, child) {
+ phy_addr = of_mdio_parse_addr(&pdev->dev, child);
+ if (phy_addr < 0) {
+ ret = phy_addr;
+ goto err_out_free_phys;
+ }
+ irq = irq_of_parse_and_map(child, 0);
+
+ ret = of_phy_parse_fixed_link(child, &status, &link_gpio);
+ if (ret < 0)
+ goto err_out_free_phys;
+
+ ret = fixed_phy_add_fmb(fmb, irq, phy_addr,
+ &status, link_gpio);
+ if (ret < 0)
+ goto err_out_free_phys;
+ }
+
+ ret = of_mdiobus_register(bus, np);
+ if (ret < 0)
+ goto err_out_free_mdiobus;
+
+ platform_set_drvdata(pdev, bus);
+
+ return 0;
+
+err_out_free_phys:
+ for (phy_addr = 0; phy_addr < PHY_MAX_ADDR; phy_addr++)
+ fixed_phy_del(phy_addr);
+
+err_out_free_mdiobus:
+ mdiobus_free(bus);
+ return ret;
+}
+
+static int mdio_fixed_phy_remove(struct platform_device *pdev)
+{
+ struct mii_bus *bus = platform_get_drvdata(pdev);
+ int phy_addr;
+
+ mdiobus_unregister(bus);
+
+ for (phy_addr = 0; phy_addr < PHY_MAX_ADDR; phy_addr++)
+ fixed_phy_del(phy_addr);
+
+ mdiobus_free(bus);
+
+ return 0;
+}
+
+static const struct of_device_id mdio_fixed_phy_dt_ids[] = {
+ { .compatible = "linux,mdio-fixed-phy" },
+ { }
+};
+
+MODULE_DEVICE_TABLE(of, mdio_fixed_phy_dt_ids);
+
+static struct platform_driver mdio_fixed_phy_driver = {
+ .probe = mdio_fixed_phy_probe,
+ .remove = mdio_fixed_phy_remove,
+ .driver = {
+ .name = "mdio-fixed-phy",
+ .of_match_table = mdio_fixed_phy_dt_ids,
+ },
+};
+
static int __init fixed_mdio_bus_init(void)
{
struct fixed_mdio_bus *fmb = &platform_fmb;
@@ -406,8 +513,14 @@ static int __init fixed_mdio_bus_init(void)
if (ret)
goto err_mdiobus_alloc;
+ ret = platform_driver_register(&mdio_fixed_phy_driver);
+ if (ret)
+ goto err_mdiobus_register;
+
return 0;
+err_mdiobus_register:
+ mdiobus_unregister(fmb->mii_bus);
err_mdiobus_alloc:
mdiobus_free(fmb->mii_bus);
err_mdiobus_reg:
@@ -422,6 +535,7 @@ static void __exit fixed_mdio_bus_exit(void)
struct fixed_mdio_bus *fmb = &platform_fmb;
struct fixed_phy *fp, *tmp;
+ platform_driver_unregister(&mdio_fixed_phy_driver);
mdiobus_unregister(fmb->mii_bus);
mdiobus_free(fmb->mii_bus);
platform_device_unregister(pdev);
--
2.7.0
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