[PATCH net-next v4 4/7] net: phy: introduce genphy_c45_pma_baset1_read_master_slave()

[Oleksij Rempel <o.rempel@pengutronix.de>]

Move baset1 specific part of genphy_c45_read_pma() code to
separate function to make it reusable by PHY drivers.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
---
 drivers/net/phy/phy-c45.c | 31 +++++++++++++++++++++++++------
 include/linux/phy.h       |  1 +
 2 files changed, 26 insertions(+), 6 deletions(-)

diff --git a/drivers/net/phy/phy-c45.c b/drivers/net/phy/phy-c45.c
index b1f7c63f66cd..d440b76a18b4 100644
--- a/drivers/net/phy/phy-c45.c
+++ b/drivers/net/phy/phy-c45.c
@@ -550,6 +550,30 @@ int genphy_c45_read_lpa(struct phy_device *phydev)
 }
 EXPORT_SYMBOL_GPL(genphy_c45_read_lpa);
 
+/**
+ * genphy_c45_pma_baset1_read_master_slave - read forced master/slave
+ * configuration
+ * @phydev: target phy_device struct
+ */
+int genphy_c45_pma_baset1_read_master_slave(struct phy_device *phydev)
+{
+	int val;
+
+	phydev->master_slave_state = MASTER_SLAVE_STATE_UNKNOWN;
+
+	val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_PMA_PMD_BT1_CTRL);
+	if (val < 0)
+		return val;
+
+	if (val & MDIO_PMA_PMD_BT1_CTRL_CFG_MST)
+		phydev->master_slave_state = MASTER_SLAVE_STATE_MASTER;
+	else
+		phydev->master_slave_state = MASTER_SLAVE_STATE_SLAVE;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(genphy_c45_pma_baset1_read_master_slave);
+
 /**
  * genphy_c45_read_pma - read link speed etc from PMA
  * @phydev: target phy_device struct
@@ -591,14 +615,9 @@ int genphy_c45_read_pma(struct phy_device *phydev)
 	phydev->duplex = DUPLEX_FULL;
 
 	if (genphy_c45_baset1_able(phydev)) {
-		val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_PMA_PMD_BT1_CTRL);
+		val = genphy_c45_pma_baset1_read_master_slave(phydev);
 		if (val < 0)
 			return val;
-
-		if (MDIO_PMA_PMD_BT1_CTRL_CFG_MST)
-			phydev->master_slave_state = MASTER_SLAVE_STATE_MASTER;
-		else
-			phydev->master_slave_state = MASTER_SLAVE_STATE_SLAVE;
 	}
 
 	return 0;
diff --git a/include/linux/phy.h b/include/linux/phy.h
index d3f924d3b235..4713c95d65fb 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -1619,6 +1619,7 @@ int genphy_c45_an_config_aneg(struct phy_device *phydev);
 int genphy_c45_an_disable_aneg(struct phy_device *phydev);
 int genphy_c45_read_mdix(struct phy_device *phydev);
 int genphy_c45_pma_read_abilities(struct phy_device *phydev);
+int genphy_c45_pma_baset1_read_master_slave(struct phy_device *phydev);
 int genphy_c45_read_status(struct phy_device *phydev);
 int genphy_c45_config_aneg(struct phy_device *phydev);
 int genphy_c45_loopback(struct phy_device *phydev, bool enable);
-- 
2.30.2