[PATCH net-next v1 1/3] net: dsa: microchip: lan9372: add 100BaseTX PHY support

[Oleksij Rempel]

From: Lucas Stach <l.stach@xxxxxxxxxxxxxx>

On the LAN9372 the 4th internal PHY is a 100BaseTX PHY instead of a 100BaseT1
PHY. The 100BaseTX PHYs have a different base register offset.

Signed-off-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
Signed-off-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
---
 drivers/net/dsa/microchip/ksz_common.h   | 1 +
 drivers/net/dsa/microchip/lan937x_main.c | 3 +++
 drivers/net/dsa/microchip/lan937x_reg.h  | 1 +
 3 files changed, 5 insertions(+)

diff --git a/drivers/net/dsa/microchip/ksz_common.h b/drivers/net/dsa/microchip/ksz_common.h
index c784fd23a9937..f901cbe7cfdd5 100644
--- a/drivers/net/dsa/microchip/ksz_common.h
+++ b/drivers/net/dsa/microchip/ksz_common.h
@@ -22,6 +22,7 @@
 /* all KSZ switches count ports from 1 */
 #define KSZ_PORT_1 0
 #define KSZ_PORT_2 1
+#define KSZ_PORT_4 3
 
 struct ksz_device;
 struct ksz_port;
diff --git a/drivers/net/dsa/microchip/lan937x_main.c b/drivers/net/dsa/microchip/lan937x_main.c
index b479a628b1ae5..e907a5602035c 100644
--- a/drivers/net/dsa/microchip/lan937x_main.c
+++ b/drivers/net/dsa/microchip/lan937x_main.c
@@ -55,6 +55,9 @@ static int lan937x_vphy_ind_addr_wr(struct ksz_device *dev, int addr, int reg)
 	u16 addr_base = REG_PORT_T1_PHY_CTRL_BASE;
 	u16 temp;
 
+	if (dev->info->chip_id == LAN9372_CHIP_ID && addr == KSZ_PORT_4)
+		addr_base = REG_PORT_TX_PHY_CTRL_BASE;
+
 	/* get register address based on the logical port */
 	temp = PORT_CTRL_ADDR(addr, (addr_base + (reg << 2)));
 
diff --git a/drivers/net/dsa/microchip/lan937x_reg.h b/drivers/net/dsa/microchip/lan937x_reg.h
index 45b606b6429f6..7ecada9240233 100644
--- a/drivers/net/dsa/microchip/lan937x_reg.h
+++ b/drivers/net/dsa/microchip/lan937x_reg.h
@@ -147,6 +147,7 @@
 
 /* 1 - Phy */
 #define REG_PORT_T1_PHY_CTRL_BASE	0x0100
+#define REG_PORT_TX_PHY_CTRL_BASE	0x0280
 
 /* 3 - xMII */
 #define PORT_SGMII_SEL			BIT(7)
-- 
2.39.2