netdev - [PATCH] net: ks8851: Support DT-provided MAC address

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Date:   Mon, 18 Dec 2017 11:17:07 +0100
From:   Lukas Wunner <lukas@...ner.de>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     Ben Dooks <ben@...tec.co.uk>, Tristram Ha <tristram.ha@...rel.com>,
        "David J. Choi" <david.choi@...rel.com>,
        Mathias Duckeck <m.duckeck@...bus.de>, netdev@...r.kernel.org
Subject: [PATCH] net: ks8851: Support DT-provided MAC address

Allow the boot loader to specify the MAC address in the device tree
to override the EEPROM, or in case no EEPROM is present.

Cc: Ben Dooks <ben@...tec.co.uk>
Cc: Tristram Ha <tristram.ha@...rel.com>
Cc: David J. Choi <david.choi@...rel.com>
Signed-off-by: Lukas Wunner <lukas@...ner.de>
---
We're using this small patch on the "Revolution Pi" family of
open source PLCs (https://revolution.kunbus.com/) and would
love to see it mainlined.  Thanks!

 drivers/net/ethernet/micrel/ks8851.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/micrel/ks8851.c b/drivers/net/ethernet/micrel/ks8851.c
index 2fe96f1f3fe5..bd6e9014bc74 100644
--- a/drivers/net/ethernet/micrel/ks8851.c
+++ b/drivers/net/ethernet/micrel/ks8851.c
@@ -28,6 +28,7 @@
 #include <linux/spi/spi.h>
 #include <linux/gpio.h>
 #include <linux/of_gpio.h>
+#include <linux/of_net.h>
 
 #include "ks8851.h"
 
@@ -407,15 +408,23 @@ static void ks8851_read_mac_addr(struct net_device *dev)
  * @ks: The device structure
  *
  * Get or create the initial mac address for the device and then set that
- * into the station address register. If there is an EEPROM present, then
+ * into the station address register. A mac address supplied in the device
+ * tree takes precedence. Otherwise, if there is an EEPROM present, then
  * we try that. If no valid mac address is found we use eth_random_addr()
  * to create a new one.
  */
 static void ks8851_init_mac(struct ks8851_net *ks)
 {
 	struct net_device *dev = ks->netdev;
+	const u8 *mac_addr;
+
+	mac_addr = of_get_mac_address(ks->spidev->dev.of_node);
+	if (mac_addr) {
+		memcpy(dev->dev_addr, mac_addr, ETH_ALEN);
+		ks8851_write_mac_addr(dev);
+		return;
+	}
 
-	/* first, try reading what we've got already */
 	if (ks->rc_ccr & CCR_EEPROM) {
 		ks8851_read_mac_addr(dev);
 		if (is_valid_ether_addr(dev->dev_addr))
-- 
2.15.1