Add helper to identify PHYs with SmartEEE support.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 include/linux/phy.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/linux/phy.h b/include/linux/phy.h
index e6b12653c655..2e726450d3c3 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -1408,6 +1408,15 @@ static inline bool phy_polling_mode(struct phy_device *phydev)
 	return phydev->irq == PHY_POLL;
 }
 
+/**
+ * phy_has_smarteee - Tests whether a PHY supports SmartEEE.
+ * @phydev: the phy_device struct
+ */
+static inline bool phy_has_smarteee(struct phy_device *phydev)
+{
+	return phydev && phydev->drv && !!(phydev->drv->flags & PHY_SMART_EEE);
+}
+
 /**
  * phy_has_hwtstamp - Tests whether a PHY time stamp configuration.
  * @phydev: the phy_device struct
-- 
2.30.2