netdev - [PATCH net-next v2 1/2] net: phy: realtek: add dummy PHY driver for RTL8127ATF

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Message-ID: <e3d55162-210a-4fab-9abf-99c6954eee10@gmail.com>
Date: Sat, 10 Jan 2026 16:14:05 +0100
From: Heiner Kallweit <hkallweit1@...il.com>
To: Andrew Lunn <andrew@...n.ch>, Andrew Lunn <andrew+netdev@...n.ch>,
 Russell King - ARM Linux <linux@...linux.org.uk>,
 Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>,
 David Miller <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
 Vladimir Oltean <vladimir.oltean@....com>,
 Michael Klein <michael@...sekall.de>, Daniel Golle <daniel@...rotopia.org>,
 Realtek linux nic maintainers <nic_swsd@...ltek.com>,
 Aleksander Jan Bajkowski <olek2@...pl>,
 Fabio Baltieri <fabio.baltieri@...il.com>
Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH net-next v2 1/2] net: phy: realtek: add dummy PHY driver for
 RTL8127ATF

RTL8127ATF supports a SFP+ port for fiber modules (10GBASE-SR/LR/ER/ZR and
DAC). The list of supported modes was provided by Realtek. According to the
r8127 vendor driver also 1G modules are supported, but this needs some more
complexity in the driver, and only 10G mode has been tested so far.
Therefore mainline support will be limited to 10G for now.
The SFP port signals are hidden in the chip IP and driven by firmware.
Therefore mainline SFP support can't be used here.
This PHY driver is used by the RTL8127ATF support in r8169.
RTL8127ATF reports the same PHY ID as the TP version. Therefore use a dummy
PHY ID.  This PHY driver is used by the RTL8127ATF support in r8169.

Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
v2:
- move realtek_phy.h to new include/net/phy/
---
 MAINTAINERS                            |  1 +
 drivers/net/phy/realtek/realtek_main.c | 54 ++++++++++++++++++++++++++
 include/net/phy/realtek_phy.h          |  7 ++++
 3 files changed, 62 insertions(+)
 create mode 100644 include/net/phy/realtek_phy.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 765ad2daa21..44a69cc48b2 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9416,6 +9416,7 @@ F:	include/linux/phy_link_topology.h
 F:	include/linux/phylib_stubs.h
 F:	include/linux/platform_data/mdio-bcm-unimac.h
 F:	include/linux/platform_data/mdio-gpio.h
+F:	include/net/phy/
 F:	include/trace/events/mdio.h
 F:	include/uapi/linux/mdio.h
 F:	include/uapi/linux/mii.h
diff --git a/drivers/net/phy/realtek/realtek_main.c b/drivers/net/phy/realtek/realtek_main.c
index eb5b540ada0..5a7f472bf58 100644
--- a/drivers/net/phy/realtek/realtek_main.c
+++ b/drivers/net/phy/realtek/realtek_main.c
@@ -17,6 +17,7 @@
 #include <linux/delay.h>
 #include <linux/clk.h>
 #include <linux/string_choices.h>
+#include <net/phy/realtek_phy.h>
 
 #include "../phylib.h"
 #include "realtek.h"
@@ -2100,6 +2101,45 @@ static irqreturn_t rtl8221b_handle_interrupt(struct phy_device *phydev)
 	return IRQ_HANDLED;
 }
 
+static int rtlgen_sfp_get_features(struct phy_device *phydev)
+{
+	linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
+			 phydev->supported);
+
+	/* set default mode */
+	phydev->speed = SPEED_10000;
+	phydev->duplex = DUPLEX_FULL;
+
+	phydev->port = PORT_FIBRE;
+
+	return 0;
+}
+
+static int rtlgen_sfp_read_status(struct phy_device *phydev)
+{
+	int val, err;
+
+	err = genphy_update_link(phydev);
+	if (err)
+		return err;
+
+	if (!phydev->link)
+		return 0;
+
+	val = rtlgen_read_vend2(phydev, RTL_VND2_PHYSR);
+	if (val < 0)
+		return val;
+
+	rtlgen_decode_physr(phydev, val);
+
+	return 0;
+}
+
+static int rtlgen_sfp_config_aneg(struct phy_device *phydev)
+{
+	return 0;
+}
+
 static struct phy_driver realtek_drvs[] = {
 	{
 		PHY_ID_MATCH_EXACT(0x00008201),
@@ -2361,6 +2401,20 @@ static struct phy_driver realtek_drvs[] = {
 		.write_page	= rtl821x_write_page,
 		.read_mmd	= rtl822x_read_mmd,
 		.write_mmd	= rtl822x_write_mmd,
+	}, {
+		PHY_ID_MATCH_EXACT(PHY_ID_RTL_DUMMY_SFP),
+		.name		= "Realtek SFP PHY Mode",
+		.flags		= PHY_IS_INTERNAL,
+		.probe		= rtl822x_probe,
+		.get_features	= rtlgen_sfp_get_features,
+		.config_aneg	= rtlgen_sfp_config_aneg,
+		.read_status	= rtlgen_sfp_read_status,
+		.suspend	= genphy_suspend,
+		.resume		= rtlgen_resume,
+		.read_page	= rtl821x_read_page,
+		.write_page	= rtl821x_write_page,
+		.read_mmd	= rtl822x_read_mmd,
+		.write_mmd	= rtl822x_write_mmd,
 	}, {
 		PHY_ID_MATCH_EXACT(0x001ccad0),
 		.name		= "RTL8224 2.5Gbps PHY",
diff --git a/include/net/phy/realtek_phy.h b/include/net/phy/realtek_phy.h
new file mode 100644
index 00000000000..d683bc1b065
--- /dev/null
+++ b/include/net/phy/realtek_phy.h
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _REALTEK_PHY_H
+#define _REALTEK_PHY_H
+
+#define	PHY_ID_RTL_DUMMY_SFP	0x001ccbff
+
+#endif /* _REALTEK_PHY_H */
-- 
2.52.0