On Fri, 2016-01-29 at 23:11 +0100, John Holland wrote:
> 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/i
> 211-ethernet-controller-datasheet.html
> 
> Signed-off-by: John Holland <jotihojr@gmail.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.

Address is mis-spelled above

> + *  @hw: pointer to the e1000 hardware structure
> + **/
> +#ifdef defined(CONFIG_OF)

Minor nitpick, you should have the function comment header wrapped in
the #ifdef as well.

> +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)) {
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