net: phy: add phy_modify_paged_changed

Add helper function phy_modify_paged_changed, behavios is the same
as for phy_modify_changed.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 26 insertions, 5 deletions

diff --git a/drivers/net/phy/phy-core.c b/drivers/net/phy/phy-core.c
index 16667fbac8bf..9ae3abb2daca 100644
--- a/drivers/net/phy/phy-core.c
+++ b/drivers/net/phy/phy-core.c
@@ -783,24 +783,43 @@ int phy_write_paged(struct phy_device *phydev, int page, u32 regnum, u16 val)
 EXPORT_SYMBOL(phy_write_paged);
 
 /**
- * phy_modify_paged() - Convenience function for modifying a paged register
+ * phy_modify_paged_changed() - Function for modifying a paged register
  * @phydev: a pointer to a &struct phy_device
  * @page: the page for the phy
  * @regnum: register number
  * @mask: bit mask of bits to clear
  * @set: bit mask of bits to set
  *
- * Same rules as for phy_read() and phy_write().
+ * Returns negative errno, 0 if there was no change, and 1 in case of change
  */
-int phy_modify_paged(struct phy_device *phydev, int page, u32 regnum,
-                     u16 mask, u16 set)
+int phy_modify_paged_changed(struct phy_device *phydev, int page, u32 regnum,
+                             u16 mask, u16 set)
 {
         int ret = 0, oldpage;
 
         oldpage = phy_select_page(phydev, page);
         if (oldpage >= 0)
-                ret = __phy_modify(phydev, regnum, mask, set);
+                ret = __phy_modify_changed(phydev, regnum, mask, set);
 
         return phy_restore_page(phydev, oldpage, ret);
 }
+EXPORT_SYMBOL(phy_modify_paged_changed);
+
+/**
+ * phy_modify_paged() - Convenience function for modifying a paged register
+ * @phydev: a pointer to a &struct phy_device
+ * @page: the page for the phy
+ * @regnum: register number
+ * @mask: bit mask of bits to clear
+ * @set: bit mask of bits to set
+ *
+ * Same rules as for phy_read() and phy_write().
+ */
+int phy_modify_paged(struct phy_device *phydev, int page, u32 regnum,
+                     u16 mask, u16 set)
+{
+        int ret = phy_modify_paged_changed(phydev, page, regnum, mask, set);
+
+        return ret < 0 ? ret : 0;
+}
 EXPORT_SYMBOL(phy_modify_paged);
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 7117825ee57a..781f4810ceba 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -984,6 +984,8 @@ int phy_select_page(struct phy_device *phydev, int page);
 int phy_restore_page(struct phy_device *phydev, int oldpage, int ret);
 int phy_read_paged(struct phy_device *phydev, int page, u32 regnum);
 int phy_write_paged(struct phy_device *phydev, int page, u32 regnum, u16 val);
+int phy_modify_paged_changed(struct phy_device *phydev, int page, u32 regnum,
+                             u16 mask, u16 set);
 int phy_modify_paged(struct phy_device *phydev, int page, u32 regnum,
                      u16 mask, u16 set);