linux-kernel - [PATCH v1] net: phy: tja11xx: add support for master-slave configuration

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Date:   Wed, 15 Apr 2020 14:34:47 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Andrew Lunn <andrew@...n.ch>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Michal Kubecek <mkubecek@...e.cz>
Cc:     Oleksij Rempel <o.rempel@...gutronix.de>,
        David Jander <david@...tonic.nl>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Russell King <linux@...linux.org.uk>, mkl@...gutronix.de,
        Marek Vasut <marex@...x.de>
Subject: [PATCH v1] net: phy: tja11xx: add support for master-slave configuration

The TJA11xx PHYs have a vendor specific Master/Slave configuration bit,
which is not compatible with IEEE 803.2-2018 spec for 100Base-T1
devices. So, provide a custom config_ange call back to solve this
problem.

Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
---
 drivers/net/phy/nxp-tja11xx.c | 39 +++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/drivers/net/phy/nxp-tja11xx.c b/drivers/net/phy/nxp-tja11xx.c
index 2bde9386baf1f..0042ee453cbd4 100644
--- a/drivers/net/phy/nxp-tja11xx.c
+++ b/drivers/net/phy/nxp-tja11xx.c
@@ -30,6 +30,7 @@
 #define MII_ECTRL_WAKE_REQUEST		BIT(0)
 
 #define MII_CFG1			18
+#define MII_CFG1_MASTER_SLAVE		BIT(15)
 #define MII_CFG1_AUTO_OP		BIT(14)
 #define MII_CFG1_SLEEP_CONFIRM		BIT(6)
 #define MII_CFG1_LED_MODE_MASK		GENMASK(5, 4)
@@ -177,6 +178,31 @@ static int tja11xx_soft_reset(struct phy_device *phydev)
 	return genphy_soft_reset(phydev);
 }
 
+static int tja11xx_config_aneg(struct phy_device *phydev)
+{
+	u16 ctl = 0;
+	int ret;
+
+	switch (phydev->master_slave) {
+	case PORT_MODE_MASTER:
+		ctl |= MII_CFG1_MASTER_SLAVE;
+		break;
+	case PORT_MODE_SLAVE:
+		break;
+	case PORT_MODE_UNKNOWN:
+		return 0;
+	default:
+		phydev_warn(phydev, "Unsupported Master/Slave mode\n");
+		return -ENOTSUPP;
+	}
+
+	ret = phy_modify_changed(phydev, MII_CFG1, MII_CFG1_MASTER_SLAVE, ctl);
+	if (ret < 0)
+		return ret;
+
+	return __genphy_config_aneg(phydev, ret);
+}
+
 static int tja11xx_config_init(struct phy_device *phydev)
 {
 	int ret;
@@ -245,6 +271,15 @@ static int tja11xx_read_status(struct phy_device *phydev)
 
 		if (!(ret & MII_COMMSTAT_LINK_UP))
 			phydev->link = 0;
+
+		ret = phy_read(phydev, MII_CFG1);
+		if (ret < 0)
+			return ret;
+
+		if (ret & MII_CFG1_MASTER_SLAVE)
+			phydev->master_slave = PORT_MODE_MASTER;
+		else
+			phydev->master_slave = PORT_MODE_SLAVE;
 	}
 
 	return 0;
@@ -514,6 +549,7 @@ static struct phy_driver tja11xx_driver[] = {
 		.features       = PHY_BASIC_T1_FEATURES,
 		.probe		= tja11xx_probe,
 		.soft_reset	= tja11xx_soft_reset,
+		.config_aneg	= tja11xx_config_aneg,
 		.config_init	= tja11xx_config_init,
 		.read_status	= tja11xx_read_status,
 		.suspend	= genphy_suspend,
@@ -529,6 +565,7 @@ static struct phy_driver tja11xx_driver[] = {
 		.features       = PHY_BASIC_T1_FEATURES,
 		.probe		= tja11xx_probe,
 		.soft_reset	= tja11xx_soft_reset,
+		.config_aneg	= tja11xx_config_aneg,
 		.config_init	= tja11xx_config_init,
 		.read_status	= tja11xx_read_status,
 		.suspend	= genphy_suspend,
@@ -543,6 +580,7 @@ static struct phy_driver tja11xx_driver[] = {
 		.features       = PHY_BASIC_T1_FEATURES,
 		.probe		= tja1102_p0_probe,
 		.soft_reset	= tja11xx_soft_reset,
+		.config_aneg	= tja11xx_config_aneg,
 		.config_init	= tja11xx_config_init,
 		.read_status	= tja11xx_read_status,
 		.match_phy_device = tja1102_p0_match_phy_device,
@@ -561,6 +599,7 @@ static struct phy_driver tja11xx_driver[] = {
 		.features       = PHY_BASIC_T1_FEATURES,
 		/* currently no probe for Port 1 is need */
 		.soft_reset	= tja11xx_soft_reset,
+		.config_aneg	= tja11xx_config_aneg,
 		.config_init	= tja11xx_config_init,
 		.read_status	= tja11xx_read_status,
 		.match_phy_device = tja1102_p1_match_phy_device,
-- 
2.26.0.rc2