netdev - [Intel-wired-lan] [next] igb: allow setting MAC address on i211 using a device tree blob

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Date:	Fri, 29 Jan 2016 23:11:52 +0100
From:	John Holland <jotihojr@...il.com>
To:	intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	jotihojr@...il.com
Subject: [Intel-wired-lan] [next] igb: allow setting MAC address on i211 using
 a device tree blob

The Intel i211 LOM pcie ethernet controllers' iNVM operates as an OTP 
and has no externel EEPROM interface [1]. The following allows the 
driver to pickup the MAC address from a device tree blob when CONFIG_OF 
has been enabled.

[1] 
http://www.intel.com/content/www/us/en/embedded/products/networking/i211-ethernet-controller-datasheet.html

Signed-off-by: John Holland <jotihojr@...il.com>
---
  drivers/net/ethernet/intel/igb/igb_main.c | 30 
++++++++++++++++++++++++++++++
  1 file changed, 30 insertions(+)

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c 
b/drivers/net/ethernet/intel/igb/igb_main.c
index 31e5f39..9c92443 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -56,6 +56,11 @@
  #include <linux/i2c.h>
  #include "igb.h"

+#ifdef defined(CONFIG_OF)
+#include <linux/of_net.h>
+#include <linux/etherdevice.h>
+#endif
+
  #define MAJ 5
  #define MIN 3
  #define BUILD 0
@@ -2217,6 +2222,26 @@ static s32 igb_init_i2c(struct igb_adapter *adapter)
  }

  /**
+ *  igb_read_mac_addr_dts - Read mac addres from the device tree blob.
+ *  @hw: pointer to the e1000 hardware structure
+ **/
+#ifdef defined(CONFIG_OF)
+static void igb_read_mac_addr_dts(struct e1000_hw *hw)
+{
+       const u8 *mac;
+       struct device_node *dn;
+
+       dn = of_find_compatible_node(NULL, NULL, "intel,i211");
+       if (!dn)
+               return;
+
+       mac = of_get_mac_address(dn);
+       if (mac)
+               ether_addr_copy(hw->mac.addr, mac);
+}
+#endif
+
+/**
   *  igb_probe - Device Initialization Routine
   *  @pdev: PCI device information struct
   *  @ent: entry in igb_pci_tbl
@@ -2420,6 +2445,11 @@ static int igb_probe(struct pci_dev *pdev, const 
struct pci_device_id *ent)
         if (hw->mac.ops.read_mac_addr(hw))
                 dev_err(&pdev->dev, "NVM Read Error\n");

+#ifdef defined(CONFIG_OF)
+       if (!is_valid_ether_addr(hw->mac.addr))
+               igb_read_mac_addr_dts(hw);
+#endif
+
         memcpy(netdev->dev_addr, hw->mac.addr, netdev->addr_len);

         if (!is_valid_ether_addr(netdev->dev_addr)) {