netdev - [net-next PATCH v4 02/10] net: phy: Add support for 25, 50 and 100Gbps PMA to genphy_c45_read

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Message-ID: 
 <176305158956.3573217.15523423369598547315.stgit@ahduyck-xeon-server.home.arpa>
Date: Thu, 13 Nov 2025 08:33:09 -0800
From: Alexander Duyck <alexander.duyck@...il.com>
To: netdev@...r.kernel.org
Cc: kuba@...nel.org, kernel-team@...a.com, andrew+netdev@...n.ch,
 hkallweit1@...il.com, linux@...linux.org.uk, pabeni@...hat.com,
 davem@...emloft.net
Subject: [net-next PATCH v4 02/10] net: phy: Add support for 25,
 50 and 100Gbps PMA to genphy_c45_read_pma

From: Alexander Duyck <alexanderduyck@...com>

Add support for reading 25, 50, and 100G from the PMA interface for a C45
device. By doing this we enable support for future devices that support
higher speeds than the current limit of 10G.

Signed-off-by: Alexander Duyck <alexanderduyck@...com>
---
 drivers/net/phy/phy-c45.c |    9 +++++++++
 include/uapi/linux/mdio.h |    6 ++++++
 2 files changed, 15 insertions(+)

diff --git a/drivers/net/phy/phy-c45.c b/drivers/net/phy/phy-c45.c
index f5e23b53994f..d161fe3fee75 100644
--- a/drivers/net/phy/phy-c45.c
+++ b/drivers/net/phy/phy-c45.c
@@ -627,6 +627,15 @@ int genphy_c45_read_pma(struct phy_device *phydev)
 	case MDIO_CTRL1_SPEED10G:
 		phydev->speed = SPEED_10000;
 		break;
+	case MDIO_PMA_CTRL1_SPEED25G:
+		phydev->speed = SPEED_25000;
+		break;
+	case MDIO_PMA_CTRL1_SPEED50G:
+		phydev->speed = SPEED_50000;
+		break;
+	case MDIO_PMA_CTRL1_SPEED100G:
+		phydev->speed = SPEED_100000;
+		break;
 	default:
 		phydev->speed = SPEED_UNKNOWN;
 		break;
diff --git a/include/uapi/linux/mdio.h b/include/uapi/linux/mdio.h
index 9ee6eeae64b8..c32333e1156c 100644
--- a/include/uapi/linux/mdio.h
+++ b/include/uapi/linux/mdio.h
@@ -123,6 +123,12 @@
  */
 #define MDIO_CTRL1_SPEED2_5G		MDIO_PMA_CTRL1_SPEED2_5G
 #define MDIO_CTRL1_SPEED5G		MDIO_PMA_CTRL1_SPEED5G
+/* 100 Gb/s */
+#define MDIO_PMA_CTRL1_SPEED100G	(MDIO_CTRL1_SPEEDSELEXT | 0x0c)
+/* 25 Gb/s */
+#define MDIO_PMA_CTRL1_SPEED25G		(MDIO_CTRL1_SPEEDSELEXT | 0x10)
+/* 50 Gb/s */
+#define MDIO_PMA_CTRL1_SPEED50G		(MDIO_CTRL1_SPEEDSELEXT | 0x14)
 /* 2.5 Gb/s */
 #define MDIO_PMA_CTRL1_SPEED2_5G	(MDIO_CTRL1_SPEEDSELEXT | 0x18)
 /* 5 Gb/s */