netdev - [PATCH RFC 3/4] net: phy: add unlocked accessors

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Date:   Fri, 08 Dec 2017 15:48:53 +0000
From:   Russell King <rmk+kernel@...linux.org.uk>
To:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org
Subject: [PATCH RFC 3/4] net: phy: add unlocked accessors

Add unlocked versions of the bus accessors, which allows access to the
bus with all the tracing. These accessors validate that the bus mutex
is held, which is a basic requirement for all mii bus accesses.

Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
---
 include/linux/phy.h | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/include/linux/phy.h b/include/linux/phy.h
index 71d777fe6c3d..964803bd7324 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -716,6 +716,18 @@ static inline int phy_read(struct phy_device *phydev, u32 regnum)
 }
 
 /**
+ * __phy_read - convenience function for reading a given PHY register
+ * @phydev: the phy_device struct
+ * @regnum: register number to read
+ *
+ * The caller must have taken the MDIO bus lock.
+ */
+static inline int __phy_read(struct phy_device *phydev, u32 regnum)
+{
+	return __mdiobus_read(phydev->mdio.bus, phydev->mdio.addr, regnum);
+}
+
+/**
  * phy_write - Convenience function for writing a given PHY register
  * @phydev: the phy_device struct
  * @regnum: register number to write
@@ -731,6 +743,20 @@ static inline int phy_write(struct phy_device *phydev, u32 regnum, u16 val)
 }
 
 /**
+ * __phy_write - Convenience function for writing a given PHY register
+ * @phydev: the phy_device struct
+ * @regnum: register number to write
+ * @val: value to write to @regnum
+ *
+ * The caller must have taken the MDIO bus lock.
+ */
+static inline int __phy_write(struct phy_device *phydev, u32 regnum, u16 val)
+{
+	return __mdiobus_write(phydev->mdio.bus, phydev->mdio.addr, regnum,
+			       val);
+}
+
+/**
  * phy_interrupt_is_valid - Convenience function for testing a given PHY irq
  * @phydev: the phy_device struct
  *
-- 
2.7.4