net: phy: expose PHY device interface mode

Expose the PHY device interface mode through sysfs since this is an
useful piece of information for knowing how the attached networking
device will have configured its transmit/receive path.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/Documentation/ABI/testing/sysfs-bus-mdio b/Documentation/ABI/testing/sysfs-bus-mdio
index 6349749ebc2986ef0433263ee87487479f173549..2133afd0b067ca346eab433c29cd7124310881ce 100644 (file)
--- a/Documentation/ABI/testing/sysfs-bus-mdio
+++ b/Documentation/ABI/testing/sysfs-bus-mdio
@@ -7,3 +7,13 @@ Description:
                by the device during bus enumeration, encoded in hexadecimal.
                This ID is used to match the device with the appropriate
                driver.
+
+What:          /sys/bus/mdio_bus/devices/.../phy_interface
+Date:          February 2014
+KernelVersion: 3.15
+Contact:       netdev@vger.kernel.org
+Description:
+               This attribute contains the PHY interface as configured by the
+               Ethernet driver during bus enumeration, encoded in string.
+               This interface mode is used to configure the Ethernet MAC with the
+               appropriate mode for its data lines to the PHY hardware.

diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 71e49000fbf33fc50d08e3c6979014c89fdb4478..7c66ea095a4625735c97874c68f170f34230ffcc 100644 (file)
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -432,8 +432,18 @@ phy_id_show(struct device *dev, struct device_attribute *attr, char *buf)
 }
 static DEVICE_ATTR_RO(phy_id);
 
+static ssize_t
+phy_interface_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+       struct phy_device *phydev = to_phy_device(dev);
+
+       return sprintf(buf, "%s\n", phy_modes(phydev->interface));
+}
+static DEVICE_ATTR_RO(phy_interface);
+
 static struct attribute *mdio_dev_attrs[] = {
        &dev_attr_phy_id.attr,
+       &dev_attr_phy_interface.attr,
        NULL,
 };
 ATTRIBUTE_GROUPS(mdio_dev);