net: phy: Create phy_supported_speeds function which lists speeds currently supported by a phydevice
phy_supported_speeds provides a means to get a list of all the speeds a
phy device currently supports.
Signed-off-by: Zach Brown <zach.brown@ni.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index 8b7659e..ee3c793 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -261,6 +261,41 @@ static inline unsigned int phy_find_valid(unsigned int idx, u32 features)
}
/**
+ * phy_supported_speeds - return all speeds currently supported by a phy device
+ * @phy: The phy device to return supported speeds of.
+ * @speeds: buffer to store supported speeds in.
+ * @size: size of speeds buffer.
+ *
+ * Description: Returns the number of supported speeds, and fills the speeds
+ * buffer with the supported speeds. If speeds buffer is too small to contain
+ * all currently supported speeds, will return as many speeds as can fit.
+ */
+unsigned int phy_supported_speeds(struct phy_device *phy,
+ unsigned int *speeds,
+ unsigned int size)
+{
+ unsigned int count = 0;
+ unsigned int idx = 0;
+
+ while (idx < MAX_NUM_SETTINGS && count < size) {
+ idx = phy_find_valid(idx, phy->supported);
+
+ if (!(settings[idx].setting & phy->supported))
+ break;
+
+ /* Assumes settings are grouped by speed */
+ if ((count == 0) ||
+ (speeds[count - 1] != settings[idx].speed)) {
+ speeds[count] = settings[idx].speed;
+ count++;
+ }
+ idx++;
+ }
+
+ return count;
+}
+
+/**
* phy_check_valid - check if there is a valid PHY setting which matches
* speed, duplex, and feature mask
* @speed: speed to match
