linux-kernel - [PATCH net-next v2 3/3] net: mdio: mscc-miim: add lan966x internal phy reset support

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Message-Id: <20220313002536.13068-4-michael@walle.cc>
Date:   Sun, 13 Mar 2022 01:25:36 +0100
From:   Michael Walle <michael@...le.cc>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Michael Walle <michael@...le.cc>
Subject: [PATCH net-next v2 3/3] net: mdio: mscc-miim: add lan966x internal phy reset support

The LAN966x has two internal PHYs which are in reset by default. The
driver already supported the internal PHYs of the SparX-5. Now add
support for the LAN966x, too. Add a new compatible to distinguish them.

The LAN966x has additional control bits in this register, thus convert
the regmap_write() to regmap_update_bits() to leave the remaining bits
untouched. This doesn't change anything for the SparX-5 SoC, because
there, the register consists only of reset bits.

Signed-off-by: Michael Walle <michael@...le.cc>
---
 drivers/net/mdio/mdio-mscc-miim.c | 59 +++++++++++++++++++++----------
 1 file changed, 41 insertions(+), 18 deletions(-)

diff --git a/drivers/net/mdio/mdio-mscc-miim.c b/drivers/net/mdio/mdio-mscc-miim.c
index 7773d5019e66..d082a13d9af3 100644
--- a/drivers/net/mdio/mdio-mscc-miim.c
+++ b/drivers/net/mdio/mdio-mscc-miim.c
@@ -15,6 +15,7 @@
 #include <linux/of_mdio.h>
 #include <linux/phy.h>
 #include <linux/platform_device.h>
+#include <linux/property.h>
 #include <linux/regmap.h>
 
 #define MSCC_MIIM_REG_STATUS		0x0
@@ -36,11 +37,19 @@
 #define		PHY_CFG_PHY_RESET	(BIT(5) | BIT(6) | BIT(7) | BIT(8))
 #define MSCC_PHY_REG_PHY_STATUS	0x4
 
+#define LAN966X_CUPHY_COMMON_CFG	0x0
+#define		CUPHY_COMMON_CFG_RESET_N	BIT(0)
+
+struct mscc_miim_info {
+	unsigned int phy_reset_offset;
+	unsigned int phy_reset_mask;
+};
+
 struct mscc_miim_dev {
 	struct regmap *regs;
 	int mii_status_offset;
 	struct regmap *phy_regs;
-	int phy_reset_offset;
+	const struct mscc_miim_info *info;
 };
 
 /* When high resolution timers aren't built-in: we can't use usleep_range() as
@@ -157,27 +166,29 @@ static int mscc_miim_write(struct mii_bus *bus, int mii_id,
 static int mscc_miim_reset(struct mii_bus *bus)
 {
 	struct mscc_miim_dev *miim = bus->priv;
-	int offset = miim->phy_reset_offset;
-	int mask = PHY_CFG_PHY_ENA | PHY_CFG_PHY_COMMON_RESET |
-		   PHY_CFG_PHY_RESET;
+	unsigned int offset, mask;
 	int ret;
 
-	if (miim->phy_regs) {
-		ret = regmap_write(miim->phy_regs, offset, 0);
-		if (ret < 0) {
-			WARN_ONCE(1, "mscc reset set error %d\n", ret);
-			return ret;
-		}
+	if (!miim->phy_regs || !miim->info)
+		return 0;
 
-		ret = regmap_write(miim->phy_regs, offset, mask);
-		if (ret < 0) {
-			WARN_ONCE(1, "mscc reset clear error %d\n", ret);
-			return ret;
-		}
+	offset = miim->info->phy_reset_offset;
+	mask = miim->info->phy_reset_mask;
+
+	ret = regmap_update_bits(miim->phy_regs, offset, mask, 0);
+	if (ret < 0) {
+		WARN_ONCE(1, "mscc reset set error %d\n", ret);
+		return ret;
+	}
 
-		mdelay(500);
+	ret = regmap_update_bits(miim->phy_regs, offset, mask, mask);
+	if (ret < 0) {
+		WARN_ONCE(1, "mscc reset clear error %d\n", ret);
+		return ret;
 	}
 
+	mdelay(500);
+
 	return 0;
 }
 
@@ -272,7 +283,7 @@ static int mscc_miim_probe(struct platform_device *pdev)
 
 	miim = bus->priv;
 	miim->phy_regs = phy_regmap;
-	miim->phy_reset_offset = MSCC_PHY_REG_PHY_CFG;
+	miim->info = device_get_match_data(&pdev->dev);
 
 	ret = of_mdiobus_register(bus, pdev->dev.of_node);
 	if (ret < 0) {
@@ -294,8 +305,20 @@ static int mscc_miim_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct mscc_miim_info mscc_ocelot_miim_info = {
+	.phy_reset_offset = MSCC_PHY_REG_PHY_CFG,
+	.phy_reset_mask = PHY_CFG_PHY_ENA | PHY_CFG_PHY_COMMON_RESET |
+			  PHY_CFG_PHY_RESET,
+};
+
+static const struct mscc_miim_info mscc_lan966x_miim_info = {
+	.phy_reset_offset = LAN966X_CUPHY_COMMON_CFG,
+	.phy_reset_mask = CUPHY_COMMON_CFG_RESET_N,
+};
+
 static const struct of_device_id mscc_miim_match[] = {
-	{ .compatible = "mscc,ocelot-miim" },
+	{ .compatible = "mscc,ocelot-miim", .data = &mscc_ocelot_miim_info },
+	{ .compatible = "mscc,lan966x-miim", .data = &mscc_lan966x_miim_info },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, mscc_miim_match);
-- 
2.30.2