Commit 760db29b authored by Phil Elwell's avatar Phil Elwell Committed by David S. Miller
Browse files

lan78xx: Read MAC address from DT if present 



There is a standard mechanism for locating and using a MAC address from
the Device Tree. Use this facility in the lan78xx driver to support
applications without programmed EEPROM or OTP. At the same time,
regularise the handling of the different address sources.

Signed-off-by: default avatarPhil Elwell <phil@raspberrypi.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a83762d9

drivers/net/usb/lan78xx.c

+20 −22
Original line number Diff line number Diff line
@@ -37,6 +37,7 @@ 
#include <linux/irqchip/chained_irq.h>

#include <linux/microchipphy.h>

#include <linux/phy.h>

#include <linux/of_net.h>

#include "lan78xx.h"



#define DRIVER_AUTHOR	"WOOJUNG HUH <woojung.huh@microchip.com>"
@@ -1652,12 +1653,15 @@ static void lan78xx_init_mac_address(struct lan78xx_net *dev) 
	addr[5] = (addr_hi >> 8) & 0xFF;



	if (!is_valid_ether_addr(addr)) {

		/* reading mac address from EEPROM or OTP */

		if ((lan78xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN,

					 addr) == 0) ||

		    (lan78xx_read_otp(dev, EEPROM_MAC_OFFSET, ETH_ALEN,

				      addr) == 0)) {

			if (is_valid_ether_addr(addr)) {

		if (!eth_platform_get_mac_address(&dev->udev->dev, addr)) {

			/* valid address present in Device Tree */

			netif_dbg(dev, ifup, dev->net,

				  "MAC address read from Device Tree");

		} else if (((lan78xx_read_eeprom(dev, EEPROM_MAC_OFFSET,

						 ETH_ALEN, addr) == 0) ||

			    (lan78xx_read_otp(dev, EEPROM_MAC_OFFSET,

					      ETH_ALEN, addr) == 0)) &&

			   is_valid_ether_addr(addr)) {

			/* eeprom values are valid so use them */

			netif_dbg(dev, ifup, dev->net,

				  "MAC address read from EEPROM");
@@ -1674,12 +1678,6 @@ static void lan78xx_init_mac_address(struct lan78xx_net *dev) 


		ret = lan78xx_write_reg(dev, RX_ADDRL, addr_lo);

		ret = lan78xx_write_reg(dev, RX_ADDRH, addr_hi);

		} else {

			/* generate random MAC */

			random_ether_addr(addr);

			netif_dbg(dev, ifup, dev->net,

				  "MAC address set to random addr");

		}

	}



	ret = lan78xx_write_reg(dev, MAF_LO(0), addr_lo);

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