netdev - [PATCH net-next v2 01/11] net: stmmac: mdio: provide address register formatter

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Message-Id: <E1uu8ns-00000001voU-0S7b@rmk-PC.armlinux.org.uk>
Date: Thu, 04 Sep 2025 13:11:00 +0100
From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>
Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-stm32@...md-mailman.stormreply.com,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	netdev@...r.kernel.org,
	Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH net-next v2 01/11] net: stmmac: mdio: provide address register
 formatter

Rather than duplicating the logic for filling the PA (MDIO address),
GR (MDIO register/devad), CR (clock range) and GB (busy) fields of the
address register in four locations, provide a helper to do this.

Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 .../net/ethernet/stmicro/stmmac/stmmac_mdio.c | 55 ++++++++++---------
 1 file changed, 28 insertions(+), 27 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
index 0a302b711bc2..c305c202055a 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
@@ -229,6 +229,26 @@ static int stmmac_xgmac2_mdio_write_c45(struct mii_bus *bus, int phyaddr,
 					phydata);
 }
 
+/**
+ * stmmac_mdio_format_addr() - format the address register
+ * @priv: struct stmmac_priv pointer
+ * @pa: 5-bit MDIO package address
+ * @gr: 5-bit MDIO register address (C22) or MDIO device address (C45)
+ *
+ * Return: formatted address register
+ */
+static u32 stmmac_mdio_format_addr(struct stmmac_priv *priv,
+				   unsigned int pa, unsigned int gr)
+{
+	const struct mii_regs *mii_regs = &priv->hw->mii;
+
+	return ((pa << mii_regs->addr_shift) & mii_regs->addr_mask) |
+	       ((gr << mii_regs->reg_shift) & mii_regs->reg_mask) |
+	       ((priv->clk_csr << mii_regs->clk_csr_shift) &
+		mii_regs->clk_csr_mask) |
+	       MII_BUSY;
+}
+
 static int stmmac_mdio_read(struct stmmac_priv *priv, int data, u32 value)
 {
 	unsigned int mii_address = priv->hw->mii.addr;
@@ -263,18 +283,14 @@ static int stmmac_mdio_read(struct stmmac_priv *priv, int data, u32 value)
 static int stmmac_mdio_read_c22(struct mii_bus *bus, int phyaddr, int phyreg)
 {
 	struct stmmac_priv *priv = netdev_priv(bus->priv);
-	u32 value = MII_BUSY;
 	int data = 0;
+	u32 value;
 
 	data = pm_runtime_resume_and_get(priv->device);
 	if (data < 0)
 		return data;
 
-	value |= (phyaddr << priv->hw->mii.addr_shift)
-		& priv->hw->mii.addr_mask;
-	value |= (phyreg << priv->hw->mii.reg_shift) & priv->hw->mii.reg_mask;
-	value |= (priv->clk_csr << priv->hw->mii.clk_csr_shift)
-		& priv->hw->mii.clk_csr_mask;
+	value = stmmac_mdio_format_addr(priv, phyaddr, phyreg);
 	if (priv->plat->has_gmac4)
 		value |= MII_GMAC4_READ;
 
@@ -300,20 +316,16 @@ static int stmmac_mdio_read_c45(struct mii_bus *bus, int phyaddr, int devad,
 				int phyreg)
 {
 	struct stmmac_priv *priv = netdev_priv(bus->priv);
-	u32 value = MII_BUSY;
 	int data = 0;
+	u32 value;
 
 	data = pm_runtime_resume_and_get(priv->device);
 	if (data < 0)
 		return data;
 
-	value |= (phyaddr << priv->hw->mii.addr_shift)
-		& priv->hw->mii.addr_mask;
-	value |= (priv->clk_csr << priv->hw->mii.clk_csr_shift)
-		& priv->hw->mii.clk_csr_mask;
+	value = stmmac_mdio_format_addr(priv, phyaddr, devad);
 	value |= MII_GMAC4_READ;
 	value |= MII_GMAC4_C45E;
-	value |= (devad << priv->hw->mii.reg_shift) & priv->hw->mii.reg_mask;
 
 	data |= phyreg << MII_GMAC4_REG_ADDR_SHIFT;
 
@@ -357,18 +369,13 @@ static int stmmac_mdio_write_c22(struct mii_bus *bus, int phyaddr, int phyreg,
 {
 	struct stmmac_priv *priv = netdev_priv(bus->priv);
 	int ret, data = phydata;
-	u32 value = MII_BUSY;
+	u32 value;
 
 	ret = pm_runtime_resume_and_get(priv->device);
 	if (ret < 0)
 		return ret;
 
-	value |= (phyaddr << priv->hw->mii.addr_shift)
-		& priv->hw->mii.addr_mask;
-	value |= (phyreg << priv->hw->mii.reg_shift) & priv->hw->mii.reg_mask;
-
-	value |= (priv->clk_csr << priv->hw->mii.clk_csr_shift)
-		& priv->hw->mii.clk_csr_mask;
+	value = stmmac_mdio_format_addr(priv, phyaddr, phyreg);
 	if (priv->plat->has_gmac4)
 		value |= MII_GMAC4_WRITE;
 	else
@@ -395,21 +402,15 @@ static int stmmac_mdio_write_c45(struct mii_bus *bus, int phyaddr,
 {
 	struct stmmac_priv *priv = netdev_priv(bus->priv);
 	int ret, data = phydata;
-	u32 value = MII_BUSY;
+	u32 value;
 
 	ret = pm_runtime_resume_and_get(priv->device);
 	if (ret < 0)
 		return ret;
 
-	value |= (phyaddr << priv->hw->mii.addr_shift)
-		& priv->hw->mii.addr_mask;
-
-	value |= (priv->clk_csr << priv->hw->mii.clk_csr_shift)
-		& priv->hw->mii.clk_csr_mask;
-
+	value = stmmac_mdio_format_addr(priv, phyaddr, devad);
 	value |= MII_GMAC4_WRITE;
 	value |= MII_GMAC4_C45E;
-	value |= (devad << priv->hw->mii.reg_shift) & priv->hw->mii.reg_mask;
 
 	data |= phyreg << MII_GMAC4_REG_ADDR_SHIFT;
 
-- 
2.47.2