linux-kernel - [PATCH v4 08/18] net: davinci_emac: potentially get the MAC address from MTD

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Message-Id: <20180629094039.7543-9-brgl@bgdev.pl>
Date:   Fri, 29 Jun 2018 11:40:29 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Sekhar Nori <nsekhar@...com>, Kevin Hilman <khilman@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Grygorii Strashko <grygorii.strashko@...com>,
        "David S . Miller" <davem@...emloft.net>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Lukas Wunner <lukas@...ner.de>, Rob Herring <robh@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>,
        David Lechner <david@...hnology.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Lunn <andrew@...n.ch>, Jonathan Corbet <corbet@....net>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org, netdev@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH v4 08/18] net: davinci_emac: potentially get the MAC address from MTD

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

On da850-evm board we can read the MAC address from MTD. It's currently
done in the relevant board file, but we want to get rid of all the MAC
reading callbacks from the board file (SPI and NAND). Move the reading
of the MAC address from SPI to the emac driver's probe function.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
---
 drivers/net/ethernet/ti/davinci_emac.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/ti/davinci_emac.c b/drivers/net/ethernet/ti/davinci_emac.c
index a1a6445b5a7e..48e6a7755811 100644
--- a/drivers/net/ethernet/ti/davinci_emac.c
+++ b/drivers/net/ethernet/ti/davinci_emac.c
@@ -67,7 +67,7 @@
 #include <linux/of_irq.h>
 #include <linux/of_net.h>
 #include <linux/mfd/syscon.h>
-
+#include <linux/mtd/mtd.h>
 #include <asm/irq.h>
 #include <asm/page.h>
 
@@ -1783,7 +1783,10 @@ static int davinci_emac_probe(struct platform_device *pdev)
 	struct cpdma_params dma_params;
 	struct clk *emac_clk;
 	unsigned long emac_bus_frequency;
-
+#ifdef CONFIG_MTD
+	size_t mac_addr_len;
+	struct mtd_info *mtd;
+#endif /* CONFIG_MTD */
 
 	/* obtain emac clock from kernel */
 	emac_clk = devm_clk_get(&pdev->dev, NULL);
@@ -1815,6 +1818,19 @@ static int davinci_emac_probe(struct platform_device *pdev)
 		goto err_free_netdev;
 	}
 
+#ifdef CONFIG_MTD
+	mtd = get_mtd_device_nm("MAC-Address");
+	if (!IS_ERR(mtd)) {
+		rc = mtd_read(mtd, 0, ETH_ALEN,
+			      &mac_addr_len, priv->mac_addr);
+		if (rc == 0)
+			dev_info(&pdev->dev,
+				 "Read MAC addr from SPI Flash: %pM\n",
+				 priv->mac_addr);
+		put_mtd_device(mtd);
+	}
+#endif /* CONFIG_MTD */
+
 	/* MAC addr and PHY mask , RMII enable info from platform_data */
 	memcpy(priv->mac_addr, pdata->mac_addr, ETH_ALEN);
 	priv->phy_id = pdata->phy_id;
-- 
2.17.1