linux-kernel - [PATCH net-next 5/6 v2] net: dsa: microchip: Write switch MAC address differently for KSZ8463

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Message-ID: <20250708031648.6703-6-Tristram.Ha@microchip.com>
Date: Mon, 7 Jul 2025 20:16:47 -0700
From: <Tristram.Ha@...rochip.com>
To: Woojung Huh <woojung.huh@...rochip.com>, Andrew Lunn <andrew@...n.ch>,
	Vladimir Oltean <olteanv@...il.com>, Rob Herring <robh@...nel.org>,
	"Krzysztof Kozlowski" <krzk+dt@...nel.org>, Conor Dooley
	<conor+dt@...nel.org>
CC: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
	<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, Marek Vasut <marex@...x.de>,
	<UNGLinuxDriver@...rochip.com>, <devicetree@...r.kernel.org>,
	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Tristram Ha
	<tristram.ha@...rochip.com>
Subject: [PATCH net-next 5/6 v2] net: dsa: microchip: Write switch MAC address differently for KSZ8463

From: Tristram Ha <tristram.ha@...rochip.com>

KSZ8463 uses 16-bit register definitions so it writes differently for
8-bit switch MAC address.

Signed-off-by: Tristram Ha <tristram.ha@...rochip.com>
---
 drivers/net/dsa/microchip/ksz_common.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 55108237180c..c08e6578a0df 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -4823,7 +4823,16 @@ int ksz_switch_macaddr_get(struct dsa_switch *ds, int port,
 
 	/* Program the switch MAC address to hardware */
 	for (i = 0; i < ETH_ALEN; i++) {
-		ret = ksz_write8(dev, regs[REG_SW_MAC_ADDR] + i, addr[i]);
+		if (ksz_is_ksz8463(dev)) {
+			u16 addr16 = ((u16)addr[i] << 8) | addr[i + 1];
+
+			ret = ksz_write16(dev, regs[REG_SW_MAC_ADDR] + i,
+					  addr16);
+			i++;
+		} else {
+			ret = ksz_write8(dev, regs[REG_SW_MAC_ADDR] + i,
+					 addr[i]);
+		}
 		if (ret)
 			goto macaddr_drop;
 	}
-- 
2.34.1