[PATCH net-next v2 3/4] net: phy: add phy_modify_paged_changed

[Heiner Kallweit <hkallweit1@gmail.com>]

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

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 drivers/net/phy/phy-core.c | 29 ++++++++++++++++++++++++-----
 include/linux/phy.h        |  2 ++
 2 files changed, 26 insertions(+), 5 deletions(-)

diff --git a/drivers/net/phy/phy-core.c b/drivers/net/phy/phy-core.c
index 16667fbac..9ae3abb2d 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 7117825ee..781f4810c 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);
 
-- 
2.22.0