--- /dev/null
+From 34167f1a024d2c5abae0b0325a6d0b8257160f86 Mon Sep 17 00:00:00 2001
+From: Markus Stockhausen <markus.stockhausen@gmx.de>
+Date: Wed, 13 Aug 2025 01:44:07 -0400
+Subject: net: phy: realtek: convert RTL8226-CG to c45 only
+
+Short: Convert the RTL8226-CG to c45 so it can be used in its
+Realtek based ecosystems.
+
+Long: The RTL8226-CG can be mainly found on devices of the
+Realtek Otto switch platform. Devices like the Zyxel XGS1210-12
+are based on it. These implement a hardware based phy polling
+in the background to update SoC status registers.
+
+The hardware provides 4 smi busses where phys are attached to.
+For each bus one can decide if it is polled in c45 or c22 mode.
+See https://svanheule.net/realtek/longan/register/smi_glb_ctrl
+With this setting the register access will be limited by the
+hardware. This is very complex (including caching and special
+c45-over-c22 handling). But basically it boils down to "enable
+protocol x and SoC will disable register access via protocol y".
+
+Mainline already gained support for the rtl9300 mdio driver
+in commit 24e31e474769 ("net: mdio: Add RTL9300 MDIO driver").
+
+It covers the basic features, but a lot effort is still needed
+to understand hardware properly. So it runs a simple setup by
+selecting the proper bus mode during startup.
+
+ /* Put the interfaces into C45 mode if required */
+ glb_ctrl_mask = GENMASK(19, 16);
+ for (i = 0; i < MAX_SMI_BUSSES; i++)
+ if (priv->smi_bus_is_c45[i])
+ glb_ctrl_val |= GLB_CTRL_INTF_SEL(i);
+ ...
+ err = regmap_update_bits(regmap, SMI_GLB_CTRL,
+ glb_ctrl_mask, glb_ctrl_val);
+
+To avoid complex coding later on, it limits access by only
+providing either c22 or c45:
+
+ bus->name = "Realtek Switch MDIO Bus";
+ if (priv->smi_bus_is_c45[mdio_bus]) {
+ bus->read_c45 = rtl9300_mdio_read_c45;
+ bus->write_c45 = rtl9300_mdio_write_c45;
+ } else {
+ bus->read = rtl9300_mdio_read_c22;
+ bus->write = rtl9300_mdio_write_c22;
+ }
+
+Because of these limitations the existing RTL8226 phy driver
+is not working at all on Realtek switches. Convert the driver
+to c45-only.
+
+Luckily the RTL8226 seems to support proper MDIO_PMA_EXTABLE
+flags. So standard function genphy_c45_pma_read_abilities() can
+call genphy_c45_pma_read_ext_abilities() and 10/100/1000 is
+populated right. Thus conversion is straight forward.
+
+Outputs before - REMARK: For this a "hacked" bus was used that
+toggles the mode for each c22/c45 access. But that is slow and
+produces unstable data in the SoC status registers).
+
+Settings for lan9:
+ Supported ports: [ TP MII ]
+ Supported link modes: 10baseT/Half 10baseT/Full
+ 100baseT/Half 100baseT/Full
+ 1000baseT/Full
+ 2500baseT/Full
+ Supported pause frame use: Symmetric Receive-only
+ Supports auto-negotiation: Yes
+ Supported FEC modes: Not reported
+ Advertised link modes: 10baseT/Half 10baseT/Full
+ 100baseT/Half 100baseT/Full
+ 1000baseT/Full
+ 2500baseT/Full
+ Advertised pause frame use: Symmetric Receive-only
+ Advertised auto-negotiation: Yes
+ Advertised FEC modes: Not reported
+ Speed: Unknown!
+ Duplex: Unknown! (255)
+ Port: Twisted Pair
+ PHYAD: 24
+ Transceiver: external
+ Auto-negotiation: on
+ MDI-X: Unknown
+ Supports Wake-on: d
+ Wake-on: d
+ Link detected: no
+
+Outputs with this commit:
+
+Settings for lan9:
+ Supported ports: [ TP ]
+ Supported link modes: 10baseT/Half 10baseT/Full
+ 100baseT/Half 100baseT/Full
+ 1000baseT/Full
+ 2500baseT/Full
+ Supported pause frame use: Symmetric Receive-only
+ Supports auto-negotiation: Yes
+ Supported FEC modes: Not reported
+ Advertised link modes: 10baseT/Half 10baseT/Full
+ 100baseT/Half 100baseT/Full
+ 1000baseT/Full
+ 2500baseT/Full
+ Advertised pause frame use: Symmetric Receive-only
+ Advertised auto-negotiation: Yes
+ Advertised FEC modes: Not reported
+ Speed: Unknown!
+ Duplex: Unknown! (255)
+ Port: Twisted Pair
+ PHYAD: 24
+ Transceiver: external
+ Auto-negotiation: on
+ MDI-X: Unknown
+ Supports Wake-on: d
+ Wake-on: d
+ Link detected: no
+
+Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
+Link: https://patch.msgid.link/20250813054407.1108285-1-markus.stockhausen@gmx.de
+Signed-off-by: Jakub Kicinski <kuba@kernel.org>
+---
+ drivers/net/phy/realtek/realtek_main.c | 28 +++++++++++++++++++++-------
+ 1 file changed, 21 insertions(+), 7 deletions(-)
+
+--- a/drivers/net/phy/realtek/realtek_main.c
++++ b/drivers/net/phy/realtek/realtek_main.c
+@@ -1274,6 +1274,21 @@ static int rtl822x_c45_read_status(struc
+ return 0;
+ }
+
++static int rtl822x_c45_soft_reset(struct phy_device *phydev)
++{
++ int ret, val;
++
++ ret = phy_modify_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1,
++ MDIO_CTRL1_RESET, MDIO_CTRL1_RESET);
++ if (ret < 0)
++ return ret;
++
++ return phy_read_mmd_poll_timeout(phydev, MDIO_MMD_PMAPMD,
++ MDIO_CTRL1, val,
++ !(val & MDIO_CTRL1_RESET),
++ 5000, 100000, true);
++}
++
+ static int rtl822xb_c45_read_status(struct phy_device *phydev)
+ {
+ int ret;
+@@ -1660,13 +1675,12 @@ static struct phy_driver realtek_drvs[]
+ }, {
+ PHY_ID_MATCH_EXACT(0x001cc838),
+ .name = "RTL8226-CG 2.5Gbps PHY",
+- .get_features = rtl822x_get_features,
+- .config_aneg = rtl822x_config_aneg,
+- .read_status = rtl822x_read_status,
+- .suspend = genphy_suspend,
+- .resume = rtlgen_resume,
+- .read_page = rtl821x_read_page,
+- .write_page = rtl821x_write_page,
++ .soft_reset = rtl822x_c45_soft_reset,
++ .get_features = rtl822x_c45_get_features,
++ .config_aneg = rtl822x_c45_config_aneg,
++ .read_status = rtl822x_c45_read_status,
++ .suspend = genphy_c45_pma_suspend,
++ .resume = rtlgen_c45_resume,
+ }, {
+ PHY_ID_MATCH_EXACT(0x001cc848),
+ .name = "RTL8226B-CG_RTL8221B-CG 2.5Gbps PHY",
--- a/drivers/net/phy/realtek/realtek_main.c
+++ b/drivers/net/phy/realtek/realtek_main.c
-@@ -1638,6 +1638,7 @@ static struct phy_driver realtek_drvs[]
+@@ -1653,6 +1653,7 @@ static struct phy_driver realtek_drvs[]
}, {
.name = "RTL8226 2.5Gbps PHY",
.match_phy_device = rtl8226_match_phy_device,
.get_features = rtl822x_get_features,
.config_aneg = rtl822x_config_aneg,
.read_status = rtl822x_read_status,
-@@ -1648,6 +1649,7 @@ static struct phy_driver realtek_drvs[]
+@@ -1663,6 +1664,7 @@ static struct phy_driver realtek_drvs[]
}, {
.match_phy_device = rtl8221b_match_phy_device,
.name = "RTL8226B_RTL8221B 2.5Gbps PHY",
.get_features = rtl822x_get_features,
.config_aneg = rtl822x_config_aneg,
.config_init = rtl822xb_config_init,
-@@ -1660,6 +1662,7 @@ static struct phy_driver realtek_drvs[]
- }, {
- PHY_ID_MATCH_EXACT(0x001cc838),
- .name = "RTL8226-CG 2.5Gbps PHY",
-+ .soft_reset = genphy_soft_reset,
- .get_features = rtl822x_get_features,
- .config_aneg = rtl822x_config_aneg,
- .read_status = rtl822x_read_status,
-@@ -1670,6 +1673,7 @@ static struct phy_driver realtek_drvs[]
+@@ -1684,6 +1686,7 @@ static struct phy_driver realtek_drvs[]
}, {
PHY_ID_MATCH_EXACT(0x001cc848),
.name = "RTL8226B-CG_RTL8221B-CG 2.5Gbps PHY",
.get_features = rtl822x_get_features,
.config_aneg = rtl822x_config_aneg,
.config_init = rtl822xb_config_init,
-@@ -1682,6 +1686,7 @@ static struct phy_driver realtek_drvs[]
+@@ -1696,6 +1699,7 @@ static struct phy_driver realtek_drvs[]
}, {
.match_phy_device = rtl8221b_vb_cg_c22_match_phy_device,
.name = "RTL8221B-VB-CG 2.5Gbps PHY (C22)",
.probe = rtl822x_probe,
.get_features = rtl822x_get_features,
.config_aneg = rtl822x_config_aneg,
-@@ -1695,6 +1700,7 @@ static struct phy_driver realtek_drvs[]
+@@ -1709,6 +1713,7 @@ static struct phy_driver realtek_drvs[]
}, {
.match_phy_device = rtl8221b_vb_cg_c45_match_phy_device,
.name = "RTL8221B-VB-CG 2.5Gbps PHY (C45)",
.probe = rtl822x_probe,
.config_init = rtl822xb_config_init,
.get_rate_matching = rtl822xb_get_rate_matching,
-@@ -1706,6 +1712,7 @@ static struct phy_driver realtek_drvs[]
+@@ -1720,6 +1725,7 @@ static struct phy_driver realtek_drvs[]
}, {
.match_phy_device = rtl8221b_vn_cg_c22_match_phy_device,
.name = "RTL8221B-VM-CG 2.5Gbps PHY (C22)",
.probe = rtl822x_probe,
.get_features = rtl822x_get_features,
.config_aneg = rtl822x_config_aneg,
-@@ -1719,6 +1726,7 @@ static struct phy_driver realtek_drvs[]
+@@ -1733,6 +1739,7 @@ static struct phy_driver realtek_drvs[]
}, {
.match_phy_device = rtl8221b_vn_cg_c45_match_phy_device,
.name = "RTL8221B-VN-CG 2.5Gbps PHY (C45)",
--- a/drivers/net/phy/realtek/realtek_main.c
+++ b/drivers/net/phy/realtek/realtek_main.c
-@@ -1313,9 +1313,11 @@ static bool rtlgen_supports_2_5gbps(stru
+@@ -1328,9 +1328,11 @@ static bool rtlgen_supports_2_5gbps(stru
{
int val;
Signed-off-by: Mieczyslaw Nalewaj <namiltd@yahoo.com>
--- a/drivers/net/phy/realtek/realtek_main.c
+++ b/drivers/net/phy/realtek/realtek_main.c
-@@ -1368,10 +1368,32 @@ static int rtl8226_match_phy_device(stru
+@@ -1383,10 +1383,32 @@ static int rtl8226_match_phy_device(stru
static int rtlgen_is_c45_match(struct phy_device *phydev, unsigned int id,
bool is_c45)
{
--- a/drivers/net/phy/realtek/realtek_main.c
+++ b/drivers/net/phy/realtek/realtek_main.c
-@@ -1580,6 +1580,51 @@ static irqreturn_t rtl9000a_handle_inter
+@@ -1595,6 +1595,51 @@ static irqreturn_t rtl9000a_handle_inter
return IRQ_HANDLED;
}
static struct phy_driver realtek_drvs[] = {
{
PHY_ID_MATCH_EXACT(0x00008201),
-@@ -1745,6 +1790,8 @@ static struct phy_driver realtek_drvs[]
+@@ -1758,6 +1803,8 @@ static struct phy_driver realtek_drvs[]
}, {
.match_phy_device = rtl8221b_vb_cg_c22_match_phy_device,
.name = "RTL8221B-VB-CG 2.5Gbps PHY (C22)",
.soft_reset = genphy_soft_reset,
.probe = rtl822x_probe,
.get_features = rtl822x_get_features,
-@@ -1759,6 +1806,8 @@ static struct phy_driver realtek_drvs[]
+@@ -1772,6 +1819,8 @@ static struct phy_driver realtek_drvs[]
}, {
.match_phy_device = rtl8221b_vb_cg_c45_match_phy_device,
.name = "RTL8221B-VB-CG 2.5Gbps PHY (C45)",
.soft_reset = genphy_soft_reset,
.probe = rtl822x_probe,
.config_init = rtl822xb_config_init,
-@@ -1771,6 +1820,8 @@ static struct phy_driver realtek_drvs[]
+@@ -1784,6 +1833,8 @@ static struct phy_driver realtek_drvs[]
}, {
.match_phy_device = rtl8221b_vn_cg_c22_match_phy_device,
.name = "RTL8221B-VM-CG 2.5Gbps PHY (C22)",
.soft_reset = genphy_soft_reset,
.probe = rtl822x_probe,
.get_features = rtl822x_get_features,
-@@ -1785,6 +1836,8 @@ static struct phy_driver realtek_drvs[]
+@@ -1798,6 +1849,8 @@ static struct phy_driver realtek_drvs[]
}, {
.match_phy_device = rtl8221b_vn_cg_c45_match_phy_device,
.name = "RTL8221B-VN-CG 2.5Gbps PHY (C45)",
static int rtl822xb_get_rate_matching(struct phy_device *phydev,
phy_interface_t iface)
{
-@@ -1813,7 +1829,7 @@ static struct phy_driver realtek_drvs[]
+@@ -1826,7 +1842,7 @@ static struct phy_driver realtek_drvs[]
.handle_interrupt = rtl8221b_handle_interrupt,
.soft_reset = genphy_soft_reset,
.probe = rtl822x_probe,
.get_rate_matching = rtl822xb_get_rate_matching,
.get_features = rtl822x_c45_get_features,
.config_aneg = rtl822x_c45_config_aneg,
-@@ -1843,7 +1859,7 @@ static struct phy_driver realtek_drvs[]
+@@ -1856,7 +1872,7 @@ static struct phy_driver realtek_drvs[]
.handle_interrupt = rtl8221b_handle_interrupt,
.soft_reset = genphy_soft_reset,
.probe = rtl822x_probe,
projects / thirdparty / openwrt.git / commitdiff
