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References: <20230713095743.30517-1-fercerpav@gmail.com>
In-Reply-To: <20230713095743.30517-1-fercerpav@gmail.com>
From:   Pavan Chebbi <pavan.chebbi@broadcom.com>
Date:   Fri, 14 Jul 2023 10:14:02 +0530
Message-ID: <CALs4sv08GJXexShzkrhhW5CDSgJC0z3om5YJzy_qYRqEtvyMtg@mail.gmail.com>
Subject: Re: [PATCH] net: ftgmac100: support getting MAC address from NVMEM
To:     Paul Fertser <fercerpav@gmail.com>
Cc:     netdev@vger.kernel.org, "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>, Andrew Lunn <andrew@lunn.ch>,
        Liang He <windhl@126.com>, Geoff Levand <geoff@infradead.org>,
        Leon Romanovsky <leon@kernel.org>,
        Tao Ren <rentao.bupt@gmail.com>,
        Wolfram Sang <wsa+renesas@sang-engineering.com>,
        openbmc@lists.ozlabs.org, linux-kernel@vger.kernel.org
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On Thu, Jul 13, 2023 at 3:28=E2=80=AFPM Paul Fertser <fercerpav@gmail.com> =
wrote:
>
> Make use of of_get_ethdev_address() to support reading MAC address not
> only from the usual DT nodes but also from an NVMEM provider (e.g. using
> a dedicated area in an FRU EEPROM).
>

Looks like earlier ftgmac100_probe() would move on with self generated
(random) MAC addr if getting it from the device failed.
Now you will fail the probe in a failure case. Is that OK?

> Signed-off-by: Paul Fertser <fercerpav@gmail.com>
> ---
>  drivers/net/ethernet/faraday/ftgmac100.c | 16 ++++++++++++----
>  1 file changed, 12 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ether=
net/faraday/ftgmac100.c
> index a03879a27b04..9135b918dd49 100644
> --- a/drivers/net/ethernet/faraday/ftgmac100.c
> +++ b/drivers/net/ethernet/faraday/ftgmac100.c
> @@ -177,16 +177,20 @@ static void ftgmac100_write_mac_addr(struct ftgmac1=
00 *priv, const u8 *mac)
>         iowrite32(laddr, priv->base + FTGMAC100_OFFSET_MAC_LADR);
>  }
>
> -static void ftgmac100_initial_mac(struct ftgmac100 *priv)
> +static int ftgmac100_initial_mac(struct ftgmac100 *priv)
>  {
>         u8 mac[ETH_ALEN];
>         unsigned int m;
>         unsigned int l;
> +       int err;
>
> -       if (!device_get_ethdev_address(priv->dev, priv->netdev)) {
> +       err =3D of_get_ethdev_address(priv->dev->of_node, priv->netdev);
> +       if (err =3D=3D -EPROBE_DEFER)
> +               return err;
> +       if (!err) {
>                 dev_info(priv->dev, "Read MAC address %pM from device tre=
e\n",
>                          priv->netdev->dev_addr);
> -               return;
> +               return 0;
>         }
>
>         m =3D ioread32(priv->base + FTGMAC100_OFFSET_MAC_MADR);
> @@ -207,6 +211,8 @@ static void ftgmac100_initial_mac(struct ftgmac100 *p=
riv)
>                 dev_info(priv->dev, "Generated random MAC address %pM\n",
>                          priv->netdev->dev_addr);
>         }
> +
> +       return 0;
>  }
>
>  static int ftgmac100_set_mac_addr(struct net_device *dev, void *p)
> @@ -1843,7 +1849,9 @@ static int ftgmac100_probe(struct platform_device *=
pdev)
>         priv->aneg_pause =3D true;
>
>         /* MAC address from chip or random one */
> -       ftgmac100_initial_mac(priv);
> +       err =3D ftgmac100_initial_mac(priv);
> +       if (err)
> +               goto err_phy_connect;
>
>         np =3D pdev->dev.of_node;
>         if (np && (of_device_is_compatible(np, "aspeed,ast2400-mac") ||
> --
> 2.34.1
>
>

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