linux-kernel - [PATCH net-next v2 6/6] net: dsa: microchip: ksz9477: make switch MAC address configurable

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Message-Id: <20230721135501.1464455-7-o.rempel@pengutronix.de>
Date:   Fri, 21 Jul 2023 15:55:01 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     "David S. Miller" <davem@...emloft.net>,
        Andrew Lunn <andrew@...n.ch>,
        Eric Dumazet <edumazet@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Woojung Huh <woojung.huh@...rochip.com>,
        Arun Ramadoss <arun.ramadoss@...rochip.com>,
        Conor Dooley <conor+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Oleksij Rempel <o.rempel@...gutronix.de>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        UNGLinuxDriver@...rochip.com,
        "Russell King (Oracle)" <linux@...linux.org.uk>,
        devicetree@...r.kernel.org
Subject: [PATCH net-next v2 6/6] net: dsa: microchip: ksz9477: make switch MAC address configurable

The switch MAC address is used for sending pause frames and for Wake on Magic
Packet. So, make use of local-mac-address property in the switch node
root and configure it in the HW.

Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
---
 drivers/net/dsa/microchip/ksz9477.c    | 8 ++++++++
 drivers/net/dsa/microchip/ksz_common.c | 7 +++++++
 drivers/net/dsa/microchip/ksz_common.h | 2 ++
 3 files changed, 17 insertions(+)

diff --git a/drivers/net/dsa/microchip/ksz9477.c b/drivers/net/dsa/microchip/ksz9477.c
index 69909241b1f44..427176c1441f7 100644
--- a/drivers/net/dsa/microchip/ksz9477.c
+++ b/drivers/net/dsa/microchip/ksz9477.c
@@ -1211,6 +1211,14 @@ int ksz9477_setup(struct dsa_switch *ds)
 	if (dev->wakeup_source)
 		ksz_write8(dev, REG_SW_PME_CTRL, PME_ENABLE);
 
+	if (is_valid_ether_addr(dev->mac_addr)) {
+		int i;
+
+		for (i = 0; i < ETH_ALEN; i++)
+			ksz_write8(dev, REG_SW_MAC_ADDR_0 + i,
+				   dev->mac_addr[i]);
+	}
+
 	return 0;
 }
 
diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index a7b298838932c..4de2456b5a349 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -3684,6 +3684,8 @@ int ksz_switch_register(struct ksz_device *dev)
 	for (port_num = 0; port_num < dev->info->port_cnt; ++port_num)
 		dev->ports[port_num].interface = PHY_INTERFACE_MODE_NA;
 	if (dev->dev->of_node) {
+		const u8 *mac;
+
 		ret = of_get_phy_mode(dev->dev->of_node, &interface);
 		if (ret == 0)
 			dev->compat_interface = interface;
@@ -3718,6 +3720,11 @@ int ksz_switch_register(struct ksz_device *dev)
 
 		dev->wakeup_source = of_property_read_bool(dev->dev->of_node,
 							   "wakeup-source");
+
+		mac = of_get_property(dev->dev->of_node, "local-mac-address",
+				      NULL);
+		if (mac)
+			memcpy(dev->mac_addr, mac, ETH_ALEN);
 	}
 
 	ret = dsa_register_switch(dev->ds);
diff --git a/drivers/net/dsa/microchip/ksz_common.h b/drivers/net/dsa/microchip/ksz_common.h
index 589f8b582a415..bdfcd1dc02ee9 100644
--- a/drivers/net/dsa/microchip/ksz_common.h
+++ b/drivers/net/dsa/microchip/ksz_common.h
@@ -171,6 +171,8 @@ struct ksz_device {
 	struct mutex lock_irq;		/* IRQ Access */
 	struct ksz_irq girq;
 	struct ksz_ptp_data ptp_data;
+
+	u8 mac_addr[ETH_ALEN];
 };
 
 /* List of supported models */
-- 
2.39.2