[PATCH net-next v3] net: phy: realtek: Add support for JLSemi JL2101 and JL2121 PHYs

[Pufan Jin <cyan2254650260@gmail.com>]

JLSemi (JingLue Semiconductor) JL2101 and JL2121 Gigabit Ethernet PHYs
are register-compatible second-source alternatives to the Realtek
RTL8211F. They share the same paged register layout (page select at
register 0x1f), RGMII TX/RX internal delay registers (page 0xd08
regs 11/15), and specific status register (0x1a). Wake-on-LAN (WoL)
events (page 0xd8a regs 16/17 and page 0xd8c reg 16) and LED control
registers (page 0xd04 reg 0x10) match RTL8211F.

Unlike RTL8211F where PHYSR (0x1a) can be read directly on page 0,
JL2101/JL2121 requires reading PHYSR from page 0xa43 via
phy_read_paged(). Reading 0x1a on page 0 yields 0x0000, which causes
rtlgen_decode_physr() to erroneously downshift to 10Mbps half duplex.
Introduce jlsemi_read_status() to read PHYSR with page 0xa43.

Extend the Realtek PHY driver to bind JL2101 and JL2121 by their PHY IDs
to the RTL8211F-compatible driver operations, and add their PHY IDs to
the MDIO module device table.

Signed-off-by: Pufan Jin <cyan2254650260@gmail.com>
---
Changes in v3:
- Drop standalone driver drivers/net/phy/jlsemi.c and extend the Realtek
  PHY driver directly as suggested by Andrew Lunn.
- Add jlsemi_read_status() to read PHYSR (0x1a) via phy_read_paged()
  from page 0xa43, avoiding false downshift to 10Mbps half duplex (verified
  on physical ALINX AX7Z020B board).

Changes in v2:
- Drop redundant phy_interface_is_rgmii() check in jlsemi_config_init()
  (Andrew Lunn)
- Change speed check in jlsemi_read_status() to '>= SPEED_1000' since
  JL21xx only supports up to 1000M and 100BASE-TX does not use Master/Slave
  clock resolution (Andrew Lunn)
- Check device_can_wakeup() and configure wakeup capability and wake IRQ
  in probe() when 'wakeup-source' is present (Andrew Lunn)
- Drop redundant .features = PHY_GBIT_FEATURES (Andrew Lunn)
- Use PHY_ID_MATCH_VENDOR() for generic driver and mdio table (Andrew Lunn)
 drivers/net/phy/realtek/realtek_main.c | 61 ++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)

diff --git a/drivers/net/phy/realtek/realtek_main.c b/drivers/net/phy/realtek/realtek_main.c
index 177b62a7b..36c8f2529 100644
--- a/drivers/net/phy/realtek/realtek_main.c
+++ b/drivers/net/phy/realtek/realtek_main.c
@@ -259,6 +259,10 @@
 #define RTL_8261C				0x001cc890
 #define RTL_8261C_CG				0x001cc898
 
+#define JLSEMI_JL2101_PHYID			0x937c4032
+#define JLSEMI_JL2121_PHYID			0x937c4030
+#define JLSEMI_STATUS_PAGE			0xa43
+
 #define RTL8261C_CE_MODEL		0x00
 #define RTL8261D_MODEL			0x81
 #define RTL8261X_INT_AUTONEG_ERROR	BIT(0)
@@ -1731,6 +1735,23 @@ static int rtlgen_read_status(struct phy_device *phydev)
 	return 0;
 }
 
+static int jlsemi_read_status(struct phy_device *phydev)
+{
+	int ret, val;
+
+	ret = genphy_read_status(phydev);
+	if (ret < 0 || !phydev->link)
+		return ret;
+
+	val = phy_read_paged(phydev, JLSEMI_STATUS_PAGE, RTL_PHYSR);
+	if (val < 0)
+		return val;
+
+	rtlgen_decode_physr(phydev, val);
+
+	return 0;
+}
+
 static int rtlgen_read_vend2(struct phy_device *phydev, int regnum)
 {
 	return __mdiobus_c45_read(phydev->mdio.bus, 0, MDIO_MMD_VEND2, regnum);
@@ -3192,6 +3213,44 @@ static struct phy_driver realtek_drvs[] = {
 		.led_hw_control_get = rtl8211f_led_hw_control_get,
 		.led_hw_control_set = rtl8211f_led_hw_control_set,
 		.disable_autonomous_eee = rtl8211f_disable_autonomous_eee,
+	}, {
+		PHY_ID_MATCH_EXACT(JLSEMI_JL2101_PHYID),
+		.name		= "JLSemi JL2101 Gigabit Ethernet",
+		.probe		= rtl8211f_probe,
+		.config_init	= &rtl8211f_config_init,
+		.read_status	= jlsemi_read_status,
+		.config_intr	= &rtl8211f_config_intr,
+		.handle_interrupt = rtl8211f_handle_interrupt,
+		.set_wol	= rtl8211f_set_wol,
+		.get_wol	= rtl8211f_get_wol,
+		.suspend	= rtl8211f_suspend,
+		.resume		= rtl8211f_resume,
+		.read_page	= rtl821x_read_page,
+		.write_page	= rtl821x_write_page,
+		.flags		= PHY_ALWAYS_CALL_SUSPEND,
+		.led_hw_is_supported = rtl8211x_led_hw_is_supported,
+		.led_hw_control_get = rtl8211f_led_hw_control_get,
+		.led_hw_control_set = rtl8211f_led_hw_control_set,
+		.disable_autonomous_eee = rtl8211f_disable_autonomous_eee,
+	}, {
+		PHY_ID_MATCH_MODEL(JLSEMI_JL2121_PHYID),
+		.name		= "JLSemi JL2121 Gigabit Ethernet",
+		.probe		= rtl8211f_probe,
+		.config_init	= &rtl8211f_config_init,
+		.read_status	= jlsemi_read_status,
+		.config_intr	= &rtl8211f_config_intr,
+		.handle_interrupt = rtl8211f_handle_interrupt,
+		.set_wol	= rtl8211f_set_wol,
+		.get_wol	= rtl8211f_get_wol,
+		.suspend	= rtl8211f_suspend,
+		.resume		= rtl8211f_resume,
+		.read_page	= rtl821x_read_page,
+		.write_page	= rtl821x_write_page,
+		.flags		= PHY_ALWAYS_CALL_SUSPEND,
+		.led_hw_is_supported = rtl8211x_led_hw_is_supported,
+		.led_hw_control_get = rtl8211f_led_hw_control_get,
+		.led_hw_control_set = rtl8211f_led_hw_control_set,
+		.disable_autonomous_eee = rtl8211f_disable_autonomous_eee,
 	}, {
 		.name		= "Generic FE-GE Realtek PHY",
 		.match_phy_device = rtlgen_match_phy_device,
@@ -3420,6 +3479,8 @@ module_phy_driver(realtek_drvs);
 
 static const struct mdio_device_id __maybe_unused realtek_tbl[] = {
 	{ PHY_ID_MATCH_VENDOR(0x001cc800) },
+	{ PHY_ID_MATCH_EXACT(JLSEMI_JL2101_PHYID) },
+	{ PHY_ID_MATCH_MODEL(JLSEMI_JL2121_PHYID) },
 	{ }
 };
 
-- 
2.56.0