Hi Javen

On 4.6.2026 09:42, javen wrote:

From: Javen Xu <redacted>

Add a generic helper to configure forced master/slave mode for Clause 
45
PHYs using the 10GBASE-T AN control register.

Signed-off-by: Javen Xu <redacted>

[...]

+/**
+ * genphy_c45_config_master_slave - Configure Master/Slave setting for 
C45 PHYs
+ * @phydev: target phy_device struct
+ *
+ * Description: Configures the Master/Slave manual setting in the
+ * 10GBASE-T control register (MMD 7, Register 0x0020) according to
+ * IEEE 802.3 standards.
+ */

Please document the return value (0 = unchanged, 1 = changed, <0 errno), 
like
it is done for genphy_c45_an_config_aneg().

+int genphy_c45_config_master_slave(struct phy_device *phydev)
+{
+	u16 val = 0;
+
+	switch (phydev->master_slave_set) {
+	case MASTER_SLAVE_CFG_MASTER_FORCE:
+		val = MDIO_AN_10GBT_CTRL_MS_ENABLE | MDIO_AN_10GBT_CTRL_MS_VALUE;
+		break;
+	case MASTER_SLAVE_CFG_SLAVE_FORCE:
+		val = MDIO_AN_10GBT_CTRL_MS_ENABLE;
+		break;
+	case MASTER_SLAVE_CFG_UNKNOWN:
+	case MASTER_SLAVE_CFG_MASTER_PREFERRED:
+	case MASTER_SLAVE_CFG_SLAVE_PREFERRED:
+	default:
+		break;
+	}

Per IEEE 802.3 (45.2.7.10.3), 7.32.13 (port type) is a copy of 9.10 /
CTL1000_PREFER_MASTER, like it is done in c22's 
genphy_setup_master_slave().

So set it for MASTER_PREFERRED, clear it for SLAVE_PREFERRED and leave 
UNKNOWN/UNSUPPORTED
untouched (return 0). Use -EOPNOTSUPP only for default.

[...]

Thanks,
Nicolai