linux-kernel - [PATCH net-next v2 1/1] net: phy: microchip: lan937x: add support for 100BaseTX PHY

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Message-Id: <20240705085550.86678-1-o.rempel@pengutronix.de>
Date: Fri,  5 Jul 2024 10:55:50 +0200
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: "David S. Miller" <davem@...emloft.net>,
	Andrew Lunn <andrew@...n.ch>,
	Eric Dumazet <edumazet@...gle.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Woojung Huh <woojung.huh@...rochip.com>,
	Arun Ramadoss <arun.ramadoss@...rochip.com>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Yuiko Oshino <yuiko.oshino@...rochip.com>
Cc: Oleksij Rempel <o.rempel@...gutronix.de>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Michal Kubiak <michal.kubiak@...el.com>,
	kernel@...gutronix.de,
	linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	UNGLinuxDriver@...rochip.com
Subject: [PATCH net-next v2 1/1] net: phy: microchip: lan937x: add support for 100BaseTX PHY

Add support of 100BaseTX PHY build in to LAN9371 and LAN9372 switches.

Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
Reviewed-by: Florian Fainelli <florian.fainelli@...adcom.com>
Reviewed-by: Michal Kubiak <michal.kubiak@...el.com>
---
changes v2:
- move LAN937X_TX code from microchip_t1.c to microchip.c
- add Reviewed-by tags
---
 drivers/net/phy/microchip.c | 75 +++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)

diff --git a/drivers/net/phy/microchip.c b/drivers/net/phy/microchip.c
index 0b88635f4fbca..b46d5d43e2585 100644
--- a/drivers/net/phy/microchip.c
+++ b/drivers/net/phy/microchip.c
@@ -12,6 +12,12 @@
 #include <linux/of.h>
 #include <dt-bindings/net/microchip-lan78xx.h>
 
+#define PHY_ID_LAN937X_TX			0x0007c190
+
+#define LAN937X_MODE_CTRL_STATUS_REG		0x11
+#define LAN937X_AUTOMDIX_EN			BIT(7)
+#define LAN937X_MDI_MODE			BIT(6)
+
 #define DRIVER_AUTHOR	"WOOJUNG HUH <woojung.huh@...rochip.com>"
 #define DRIVER_DESC	"Microchip LAN88XX PHY driver"
 
@@ -373,6 +379,66 @@ static void lan88xx_link_change_notify(struct phy_device *phydev)
 	}
 }
 
+static int lan937x_tx_read_status(struct phy_device *phydev)
+{
+	int ret;
+
+	ret = genphy_read_status(phydev);
+	if (ret < 0)
+		return ret;
+
+	ret = phy_read(phydev, LAN937X_MODE_CTRL_STATUS_REG);
+	if (ret < 0)
+		return ret;
+
+	if (ret & LAN937X_AUTOMDIX_EN) {
+		phydev->mdix_ctrl = ETH_TP_MDI_AUTO;
+		/* MDI/MDIX status is unknown */
+		phydev->mdix = ETH_TP_MDI_INVALID;
+	} else if (ret & LAN937X_MDI_MODE) {
+		phydev->mdix_ctrl = ETH_TP_MDI_X;
+		phydev->mdix = ETH_TP_MDI_X;
+	} else {
+		phydev->mdix_ctrl = ETH_TP_MDI;
+		phydev->mdix = ETH_TP_MDI;
+	}
+
+	return 0;
+}
+
+static int lan937x_tx_config_mdix(struct phy_device *phydev, u8 ctrl)
+{
+	u16 val;
+
+	switch (ctrl) {
+	case ETH_TP_MDI:
+		val = 0;
+		break;
+	case ETH_TP_MDI_X:
+		val = LAN937X_MDI_MODE;
+		break;
+	case ETH_TP_MDI_AUTO:
+		val = LAN937X_AUTOMDIX_EN;
+		break;
+	default:
+		return 0;
+	}
+
+	return phy_modify(phydev, LAN937X_MODE_CTRL_STATUS_REG,
+			  LAN937X_AUTOMDIX_EN | LAN937X_MDI_MODE, val);
+}
+
+static int lan937x_tx_config_aneg(struct phy_device *phydev)
+{
+	int ret;
+
+	ret = genphy_config_aneg(phydev);
+	if (ret)
+		return ret;
+
+	return lan937x_tx_config_mdix(phydev, phydev->mdix_ctrl);
+}
+
 static struct phy_driver microchip_phy_driver[] = {
 {
 	.phy_id		= 0x0007c132,
@@ -400,12 +466,21 @@ static struct phy_driver microchip_phy_driver[] = {
 	.set_wol	= lan88xx_set_wol,
 	.read_page	= lan88xx_read_page,
 	.write_page	= lan88xx_write_page,
+},
+{
+	PHY_ID_MATCH_MODEL(PHY_ID_LAN937X_TX),
+	.name		= "Microchip LAN937x TX",
+	.suspend	= genphy_suspend,
+	.resume		= genphy_resume,
+	.config_aneg	= lan937x_tx_config_aneg,
+	.read_status	= lan937x_tx_read_status,
 } };
 
 module_phy_driver(microchip_phy_driver);
 
 static struct mdio_device_id __maybe_unused microchip_tbl[] = {
 	{ 0x0007c132, 0xfffffff2 },
+	{ PHY_ID_MATCH_MODEL(PHY_ID_LAN937X_TX) },
 	{ }
 };
 
-- 
2.39.2