From: Russell King <rmk+kernel@armlinux.org.uk>
Date: Tue, 2 Jan 2018 10:58:53 +0000
Subject: net: phy: add phy_modify() accessor
Patch-mainline: v4.16-rc1
Git-commit: 2b74e5be17d25fbca4be236a19efcd2ecae81cb2
References: bsc#1119113 FATE#326472

Add phy_modify() convenience accessor to complement the mdiobus
counterpart.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/phy/phy-core.c |   23 +++++++++++++++++++++++
 include/linux/phy.h        |    1 +
 2 files changed, 24 insertions(+)

--- a/drivers/net/phy/phy-core.c
+++ b/drivers/net/phy/phy-core.c
@@ -349,6 +349,29 @@ int __phy_modify(struct phy_device *phyd
 }
 EXPORT_SYMBOL_GPL(__phy_modify);
 
+/**
+ * phy_modify - Convenience function for modifying a given PHY register
+ * @phydev: the phy_device struct
+ * @regnum: register number to write
+ * @mask: bit mask of bits to clear
+ * @set: new value of bits set in mask to write to @regnum
+ *
+ * NOTE: MUST NOT be called from interrupt context,
+ * because the bus read/write functions may wait for an interrupt
+ * to conclude the operation.
+ */
+int phy_modify(struct phy_device *phydev, u32 regnum, u16 mask, u16 set)
+{
+	int ret;
+
+	mutex_lock(&phydev->mdio.bus->mdio_lock);
+	ret = __phy_modify(phydev, regnum, mask, set);
+	mutex_unlock(&phydev->mdio.bus->mdio_lock);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(phy_modify);
+
 static int __phy_read_page(struct phy_device *phydev)
 {
 	return phydev->drv->read_page(phydev);
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -759,6 +759,7 @@ static inline int __phy_write(struct phy
 }
 
 int __phy_modify(struct phy_device *phydev, u32 regnum, u16 mask, u16 set);
+int phy_modify(struct phy_device *phydev, u32 regnum, u16 mask, u16 set);
 
 /**
  * phy_interrupt_is_valid - Convenience function for testing a given PHY irq