linux-kernel - Re: [PATCH] usbnet: smsc95xx: Add device tree input for MAC address

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Message-ID: <CACVXFVOVMvP=3y9h2Jrqn2sBQdKOZtrhQDAFYkdHKXFgQj=d0Q@mail.gmail.com>
Date:	Sun, 6 Oct 2013 23:05:22 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Dan Murphy <dmurphy@...com>
Cc:	Steve Glendinning <steve.glendinning@...well.net>,
	Network Development <netdev@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-usb <linux-usb@...r.kernel.org>, mugunthanvnm@...com
Subject: Re: [PATCH] usbnet: smsc95xx: Add device tree input for MAC address

On Sat, Oct 5, 2013 at 2:25 AM, Dan Murphy <dmurphy@...com> wrote:
> If the smsc95xx does not have a valid MAC address stored within
> the eeprom then a random number is generated.  The MAC can also
> be set by uBoot but the smsc95xx does not have a way to read this.
>
> Create the binding for the smsc95xx so that uBoot can set the MAC
> and the code can retrieve the MAC from the modified DTB file.

Suppose there are two smsc95xx usbnet devices connected to usb bus, and
one is built-in, another is hotplug device, can your patch handle the situation
correctly?

>
> Signed-off-by: Dan Murphy <dmurphy@...com>
> ---
>  Documentation/devicetree/bindings/net/smsc95xx.txt |   17 ++++++++++++++
>  drivers/net/usb/smsc95xx.c                         |   24 ++++++++++++++++++++
>  2 files changed, 41 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/net/smsc95xx.txt
>
> diff --git a/Documentation/devicetree/bindings/net/smsc95xx.txt b/Documentation/devicetree/bindings/net/smsc95xx.txt
> new file mode 100644
> index 0000000..4c37280
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/smsc95xx.txt
> @@ -0,0 +1,17 @@
> +* Smart Mixed-Signal Connectivity (SMSC) 95xx Controller
> +
> +Required properties:
> +None
> +
> +Optional properties:
> +- mac-address - Read the mac address that was stored by uBoot
> +- local-address - Read the mac address that was stored by uBoot
> +- address - Read the mac address that was stored by uBoot
> +
> +Examples:
> +
> +smsc0: smsc95xx@0 {
> +       /* Filled in by U-Boot */
> +       mac-address = [ 00 00 00 00 00 00 ];
> +};
> +
> diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c
> index 3f38ba8..baee0bd 100644
> --- a/drivers/net/usb/smsc95xx.c
> +++ b/drivers/net/usb/smsc95xx.c
> @@ -31,6 +31,9 @@
>  #include <linux/crc32.h>
>  #include <linux/usb/usbnet.h>
>  #include <linux/slab.h>
> +#include <linux/of.h>
> +#include <linux/of_net.h>
> +
>  #include "smsc95xx.h"
>
>  #define SMSC_CHIPNAME                  "smsc95xx"
> @@ -62,6 +65,8 @@
>  #define SUSPEND_ALLMODES               (SUSPEND_SUSPEND0 | SUSPEND_SUSPEND1 | \
>                                          SUSPEND_SUSPEND2 | SUSPEND_SUSPEND3)
>
> +#define SMSC95XX_OF_NAME       "/smsc95xx@"
> +
>  struct smsc95xx_priv {
>         u32 mac_cr;
>         u32 hash_hi;
> @@ -767,6 +772,25 @@ static int smsc95xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
>
>  static void smsc95xx_init_mac_address(struct usbnet *dev)
>  {
> +
> +#ifdef CONFIG_OF
> +       struct device_node *ap;
> +       const char *mac = NULL;
> +       char *of_name = SMSC95XX_OF_NAME;
> +
> +       sprintf(of_name, "%s%i", SMSC95XX_OF_NAME, dev->udev->dev.id);
> +       ap = of_find_node_by_path(of_name);
> +       if (ap) {
> +               mac = of_get_mac_address(ap);
> +               if (is_valid_ether_addr(mac)) {
> +                       /* Device tree has a mac for this so use that */
> +                       memcpy(dev->net->dev_addr, mac, ETH_ALEN);
> +                       netif_dbg(dev, ifup, dev->net, "MAC address read from DTB\n");
> +                       return;
> +               }
> +       }
> +#endif
> +
>         /* try reading mac address from EEPROM */
>         if (smsc95xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN,
>                         dev->net->dev_addr) == 0) {
> --
> 1.7.9.5
>
> --
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Thanks,
-- 
Ming Lei
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