netdev - [net-next][PATCH 4/4] net: davinci_emac: use nvmem_get_mac

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Date:   Fri, 30 Nov 2018 09:21:00 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Grygorii Strashko <grygorii.strashko@...com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        "David S . Miller" <davem@...emloft.net>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Sekhar Nori <nsekhar@...com>, Kevin Hilman <khilman@...nel.org>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-omap@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [net-next][PATCH 4/4] net: davinci_emac: use nvmem_get_mac_address()

From: Bartosz Golaszewski <bgolaszewski@...libre.com>

All DaVinci boards still supported in board files now define nvmem
cells containing the MAC address. We want to stop using the setup
callback from at24 so the MAC address for those users will no longer
be provided over platform data. If we didn't get a valid MAC in pdata,
try nvmem before resorting to a random MAC.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
---
 drivers/net/ethernet/ti/davinci_emac.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/ti/davinci_emac.c b/drivers/net/ethernet/ti/davinci_emac.c
index 9153db120352..840820402cd0 100644
--- a/drivers/net/ethernet/ti/davinci_emac.c
+++ b/drivers/net/ethernet/ti/davinci_emac.c
@@ -1912,11 +1912,15 @@ static int davinci_emac_probe(struct platform_device *pdev)
 		ether_addr_copy(ndev->dev_addr, priv->mac_addr);
 
 	if (!is_valid_ether_addr(priv->mac_addr)) {
-		/* Use random MAC if none passed */
-		eth_hw_addr_random(ndev);
-		memcpy(priv->mac_addr, ndev->dev_addr, ndev->addr_len);
-		dev_warn(&pdev->dev, "using random MAC addr: %pM\n",
-							priv->mac_addr);
+		/* Try nvmem if MAC wasn't passed over pdata or DT. */
+		rc = nvmem_get_mac_address(&pdev->dev, priv->mac_addr);
+		if (rc) {
+			/* Use random MAC if still none obtained. */
+			eth_hw_addr_random(ndev);
+			memcpy(priv->mac_addr, ndev->dev_addr, ndev->addr_len);
+			dev_warn(&pdev->dev, "using random MAC addr: %pM\n",
+				 priv->mac_addr);
+		}
 	}
 
 	ndev->netdev_ops = &emac_netdev_ops;
-- 
2.19.1