Subject: [PATCH RFC net-next 04/14] net: mdio: add unlocked mdiobus and mdiodev bus accessors

From: "Russell King (Oracle)" <[email-masked]>
Date: Fri, 23 Jun 2023 15:17:09 +0100

Add the following unlocked accessors to complete the set:
__mdiobus_modify()
__mdiodev_read()
__mdiodev_write()
__mdiodev_modify()
__mdiodev_modify_changed()
which we will need for Marvell DSA PCS conversion.

Reviewed-by: Andrew Lunn <[email-masked]>
Signed-off-by: Russell King (Oracle) <[email-masked]>
---
 drivers/net/phy/mdio_bus.c | 24 ++++++++++++++++++++++--
 include/linux/mdio.h       | 26 ++++++++++++++++++++++++++
 2 files changed, 48 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 8b3618d3da4a..bc04048de2fa 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -1210,6 +1210,26 @@ int mdiobus_c45_write_nested(struct mii_bus *bus, int addr, int devad,
 }
 EXPORT_SYMBOL(mdiobus_c45_write_nested);
 
+/*
+ * __mdiobus_modify - Convenience function for modifying a given mdio device
+ *	register
+ * @bus: the mii_bus struct
+ * @addr: the phy address
+ * @regnum: register number to write
+ * @mask: bit mask of bits to clear
+ * @set: bit mask of bits to set
+ */
+int __mdiobus_modify(struct mii_bus *bus, int addr, u32 regnum, u16 mask,
+		     u16 set)
+{
+	int err;
+
+	err = __mdiobus_modify_changed(bus, addr, regnum, mask, set);
+
+	return err < 0 ? err : 0;
+}
+EXPORT_SYMBOL_GPL(__mdiobus_modify);
+
 /**
  * mdiobus_modify - Convenience function for modifying a given mdio device
  *	register
@@ -1224,10 +1244,10 @@ int mdiobus_modify(struct mii_bus *bus, int addr, u32 regnum, u16 mask, u16 set)
 	int err;
 
 	mutex_lock(&bus->mdio_lock);
-	err = __mdiobus_modify_changed(bus, addr, regnum, mask, set);
+	err = __mdiobus_modify(bus, addr, regnum, mask, set);
 	mutex_unlock(&bus->mdio_lock);
 
-	return err < 0 ? err : 0;
+	return err;
 }
 EXPORT_SYMBOL_GPL(mdiobus_modify);
 
diff --git a/include/linux/mdio.h b/include/linux/mdio.h
index c1b7008826e5..8fa23bdcedbf 100644
--- a/include/linux/mdio.h
+++ b/include/linux/mdio.h
@@ -537,6 +537,8 @@ static inline void mii_c73_mod_linkmode(unsigned long *adv, u16 *lpa)
 
 int __mdiobus_read(struct mii_bus *bus, int addr, u32 regnum);
 int __mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val);
+int __mdiobus_modify(struct mii_bus *bus, int addr, u32 regnum, u16 mask,
+		     u16 set);
 int __mdiobus_modify_changed(struct mii_bus *bus, int addr, u32 regnum,
 			     u16 mask, u16 set);
 
@@ -564,6 +566,30 @@ int mdiobus_c45_modify(struct mii_bus *bus, int addr, int devad, u32 regnum,
 int mdiobus_c45_modify_changed(struct mii_bus *bus, int addr, int devad,
 			       u32 regnum, u16 mask, u16 set);
 
+static inline int __mdiodev_read(struct mdio_device *mdiodev, u32 regnum)
+{
+	return __mdiobus_read(mdiodev->bus, mdiodev->addr, regnum);
+}
+
+static inline int __mdiodev_write(struct mdio_device *mdiodev, u32 regnum,
+				  u16 val)
+{
+	return __mdiobus_write(mdiodev->bus, mdiodev->addr, regnum, val);
+}
+
+static inline int __mdiodev_modify(struct mdio_device *mdiodev, u32 regnum,
+				   u16 mask, u16 set)
+{
+	return __mdiobus_modify(mdiodev->bus, mdiodev->addr, regnum, mask, set);
+}
+
+static inline int __mdiodev_modify_changed(struct mdio_device *mdiodev,
+					   u32 regnum, u16 mask, u16 set)
+{
+	return __mdiobus_modify_changed(mdiodev->bus, mdiodev->addr, regnum,
+					mask, set);
+}
+
 static inline int mdiodev_read(struct mdio_device *mdiodev, u32 regnum)
 {
 	return mdiobus_read(mdiodev->bus, mdiodev->addr, regnum);
-- 
2.30.2