From: Xu Liang <lxu@maxlinear.com>
Date: Mon, 19 Jul 2021 13:32:11 +0800
Subject: net: phy: add API to read 802.3-c45 IDs
Patch-mainline: v5.15-rc1
Git-commit: 8b72b301b442907742c1af1b8fcb52e351a2aac1
References: jsc#PED-829

Add API to read 802.3-c45 IDs so that C22/C45 mixed device can use
C45 APIs without failing ID checks.

Signed-off-by: Xu Liang <lxu@maxlinear.com>
Acked-by: Hauke Mehrtens <hmehrtens@maxlinear.com>
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_device.c |   14 ++++++++++++++
 include/linux/phy.h          |    1 +
 2 files changed, 15 insertions(+)

--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -969,6 +969,20 @@ void phy_device_remove(struct phy_device
 EXPORT_SYMBOL(phy_device_remove);
 
 /**
+ * phy_get_c45_ids - Read 802.3-c45 IDs for phy device.
+ * @phydev: phy_device structure to read 802.3-c45 IDs
+ *
+ * Returns zero on success, %-EIO on bus access error, or %-ENODEV if
+ * the "devices in package" is invalid.
+ */
+int phy_get_c45_ids(struct phy_device *phydev)
+{
+	return get_phy_c45_ids(phydev->mdio.bus, phydev->mdio.addr,
+			       &phydev->c45_ids);
+}
+EXPORT_SYMBOL(phy_get_c45_ids);
+
+/**
  * phy_find_first - finds the first PHY device on the bus
  * @bus: the target MII bus
  */
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -1431,6 +1431,7 @@ static inline int phy_device_register(st
 static inline void phy_device_free(struct phy_device *phydev) { }
 #endif /* CONFIG_PHYLIB */
 void phy_device_remove(struct phy_device *phydev);
+int phy_get_c45_ids(struct phy_device *phydev);
 int phy_init_hw(struct phy_device *phydev);
 int phy_suspend(struct phy_device *phydev);
 int phy_resume(struct phy_device *phydev);