Some Ethernet MACs have a "fixed link", and are not connected to a normal MDIO-managed PHY device. For those situations, a Device Tree binding allows to describe a "fixed link" using a special PHY node. This patch adds: * A documentation for the fixed PHY Device Tree binding. * An of_phy_is_fixed_link() function that an Ethernet driver can call on its PHY phandle to find out whether it's a fixed link PHY or not. It should typically be used to know if of_phy_register_fixed_link() should be called. * An of_phy_register_fixed_link() function that instantiates the fixed PHY into the PHY subsystem, so that when the driver calls of_phy_connect(), the PHY device associated to the OF node will be found. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx> --- .../devicetree/bindings/net/fixed-link.txt | 34 ++++++++++++++++++++++ drivers/of/of_mdio.c | 24 +++++++++++++++ include/linux/of_mdio.h | 15 ++++++++++ 3 files changed, 73 insertions(+) create mode 100644 Documentation/devicetree/bindings/net/fixed-link.txt diff --git a/Documentation/devicetree/bindings/net/fixed-link.txt b/Documentation/devicetree/bindings/net/fixed-link.txt new file mode 100644 index 0000000..9f2a1a50 --- /dev/null +++ b/Documentation/devicetree/bindings/net/fixed-link.txt @@ -0,0 +1,34 @@ +Fixed link Device Tree binding +------------------------------ + +Some Ethernet MACs have a "fixed link", and are not connected to a +normal MDIO-managed PHY device. For those situations, a Device Tree +binding allows to describe a "fixed link". + +Such a fixed link situation is described by creating a PHY node as a +sub-node of an Ethernet device, with the following properties: + +* 'fixed-link' (boolean, mandatory), to indicate that this PHY is a + fixed link PHY. +* 'speed' (integer, mandatory), to indicate the link speed. Accepted + values are 10, 100 and 1000 +* 'full-duplex' (boolean, optional), to indicate that full duplex is + used. When absent, half duplex is assumed. +* 'pause' (boolean, optional), to indicate that pause should be + enabled. +* 'asym-pause' (boolean, optional), to indicate that asym_pause should + be enabled. + +Example: + +ethernet@0 { + ... + phy = <&phy0>; + phy0: phy@0 { + fixed-link; + speed = <1000>; + full-duplex; + }; + ... +}; + diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c index 875b7b6..c645fb8 100644 --- a/drivers/of/of_mdio.c +++ b/drivers/of/of_mdio.c @@ -14,6 +14,7 @@ #include <linux/netdevice.h> #include <linux/err.h> #include <linux/phy.h> +#include <linux/phy_fixed.h> #include <linux/of.h> #include <linux/of_irq.h> #include <linux/of_mdio.h> @@ -274,3 +275,26 @@ struct phy_device *of_phy_attach(struct net_device *dev, return phy_attach_direct(dev, phy, flags, iface) ? NULL : phy; } EXPORT_SYMBOL(of_phy_attach); + +#if defined(CONFIG_FIXED_PHY) +bool of_phy_is_fixed_link(struct device_node *np) +{ + return of_property_read_bool(np, "fixed-link"); +} +EXPORT_SYMBOL(of_phy_is_fixed_link); + +int of_phy_register_fixed_link(struct device_node *np) +{ + struct fixed_phy_status status = {}; + + status.link = 1; + status.duplex = of_property_read_bool(np, "full-duplex"); + if (of_property_read_u32(np, "speed", &status.speed)) + return -EINVAL; + status.pause = of_property_read_bool(np, "pause"); + status.asym_pause = of_property_read_bool(np, "asym-pause"); + + return fixed_phy_register(PHY_POLL, &status, np); +} +EXPORT_SYMBOL(of_phy_register_fixed_link); +#endif diff --git a/include/linux/of_mdio.h b/include/linux/of_mdio.h index 6fe8464..77a6e32 100644 --- a/include/linux/of_mdio.h +++ b/include/linux/of_mdio.h @@ -67,4 +67,19 @@ static inline struct mii_bus *of_mdio_find_bus(struct device_node *mdio_np) } #endif /* CONFIG_OF */ +#if defined(CONFIG_OF) && defined(CONFIG_FIXED_PHY) +extern int of_phy_register_fixed_link(struct device_node *np); +extern bool of_phy_is_fixed_link(struct device_node *np); +#else +static inline int of_phy_register_fixed_link(struct device_node *np) +{ + return -ENOSYS; +} +static inline bool of_phy_is_fixed_link(struct device_node *np) +{ + return false; +} +#endif + + #endif /* __LINUX_OF_MDIO_H */ -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html