linux-kernel - [PATCH v1] tg3: optionally get mac address from devicetree

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Message-Id: <20181113161508.7427-1-TheSven73@googlemail.com>
Date:   Tue, 13 Nov 2018 11:15:08 -0500
From:   thesven73@...il.com
To:     svendev@...x.com, siva.kallam@...adcom.com, prashant@...adcom.com,
        mchan@...adcom.com
Cc:     davem@...emloft.net, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, arnd@...db.de
Subject: [PATCH v1] tg3: optionally get mac address from devicetree

If the tg3 has a device node, and that node contains a valid
mac address property, use that as the tg3's mac address.

This behaviour was previously only present on SPARC, using a
conditional compile (#ifdef CONFIG_SPARC), presumably because
at the time, devicetree nodes for pci devices only worked on
SPARC. However, this has recently been made universal, see
commit 98d9f30c820d ("pci/of: Match PCI devices to OF nodes dynamically")

Devicetree example:
(see Documentation/devicetree/bindings/pci/pci.txt)

&pcie {
	host@0 {
		#address-cells = <3>;
		#size-cells = <2>;
		reg = <0 0 0 0 0>;
		bcm5778: bcm5778@0 {
			reg = <0 0 0 0 0>;
			mac-address = [CA 11 AB 1E 10 01];
		};
	};
};

Signed-off-by: Sven Van Asbroeck <svendev@...x.com>
---
 drivers/net/ethernet/broadcom/tg3.c | 29 +++++++++++++----------------
 1 file changed, 13 insertions(+), 16 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 89295306f161..b60381a70454 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -55,6 +55,7 @@
 #include <linux/hwmon.h>
 #include <linux/hwmon-sysfs.h>
 #include <linux/crc32poly.h>
+#include <linux/of_net.h>
 
 #include <net/checksum.h>
 #include <net/ip.h>
@@ -16959,23 +16960,21 @@ static int tg3_get_invariants(struct tg3 *tp, const struct pci_device_id *ent)
 	return err;
 }
 
-#ifdef CONFIG_SPARC
-static int tg3_get_macaddr_sparc(struct tg3 *tp)
+static int tg3_of_get_macaddr(struct tg3 *tp)
 {
-	struct net_device *dev = tp->dev;
-	struct pci_dev *pdev = tp->pdev;
-	struct device_node *dp = pci_device_to_OF_node(pdev);
-	const unsigned char *addr;
-	int len;
+	struct device_node *np = pci_device_to_OF_node(tp->pdev);
+	const void *mac;
 
-	addr = of_get_property(dp, "local-mac-address", &len);
-	if (addr && len == ETH_ALEN) {
-		memcpy(dev->dev_addr, addr, ETH_ALEN);
-		return 0;
-	}
-	return -ENODEV;
+	if (!np)
+		return -ENODEV;
+	mac = of_get_mac_address(np);
+	if (!mac || !is_valid_ether_addr(mac))
+		return -EINVAL;
+	memcpy(tp->dev->dev_addr, mac, ETH_ALEN);
+	return 0;
 }
 
+#ifdef CONFIG_SPARC
 static int tg3_get_default_macaddr_sparc(struct tg3 *tp)
 {
 	struct net_device *dev = tp->dev;
@@ -16992,10 +16991,8 @@ static int tg3_get_device_address(struct tg3 *tp)
 	int addr_ok = 0;
 	int err;
 
-#ifdef CONFIG_SPARC
-	if (!tg3_get_macaddr_sparc(tp))
+	if (!tg3_of_get_macaddr(tp))
 		return 0;
-#endif
 
 	if (tg3_flag(tp, IS_SSB_CORE)) {
 		err = ssb_gige_get_macaddr(tp->pdev, &dev->dev_addr[0]);
-- 
2.17.1