linux-kernel - [PATCH 07/14] net: davinci_emac: use nvmem to retrieve the mac address

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Date:   Mon, 25 Jun 2018 17:50:18 +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>
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 07/14] net: davinci_emac: use nvmem to retrieve the mac address

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

All users which store the MAC address in EEPROM now register relevant
nvmem cells. Switch to retrieving the MAC address over the nvmem
framework.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
---
 drivers/net/ethernet/ti/davinci_emac.c | 29 +++++++++++++++++---------
 1 file changed, 19 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/ti/davinci_emac.c b/drivers/net/ethernet/ti/davinci_emac.c
index a1a6445b5a7e..22c2322e46be 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/nvmem-consumer.h>
 #include <asm/irq.h>
 #include <asm/page.h>
 
@@ -1696,7 +1696,6 @@ davinci_emac_of_get_pdata(struct platform_device *pdev, struct emac_priv *priv)
 	const struct of_device_id *match;
 	const struct emac_platform_data *auxdata;
 	struct emac_platform_data *pdata = NULL;
-	const u8 *mac_addr;
 
 	if (!IS_ENABLED(CONFIG_OF) || !pdev->dev.of_node)
 		return dev_get_platdata(&pdev->dev);
@@ -1708,12 +1707,6 @@ davinci_emac_of_get_pdata(struct platform_device *pdev, struct emac_priv *priv)
 	np = pdev->dev.of_node;
 	pdata->version = EMAC_VERSION_2;
 
-	if (!is_valid_ether_addr(pdata->mac_addr)) {
-		mac_addr = of_get_mac_address(np);
-		if (mac_addr)
-			ether_addr_copy(pdata->mac_addr, mac_addr);
-	}
-
 	of_property_read_u32(np, "ti,davinci-ctrl-reg-offset",
 			     &pdata->ctrl_reg_offset);
 
@@ -1783,7 +1776,9 @@ static int davinci_emac_probe(struct platform_device *pdev)
 	struct cpdma_params dma_params;
 	struct clk *emac_clk;
 	unsigned long emac_bus_frequency;
-
+	struct nvmem_cell *cell;
+	void *mac_addr;
+	size_t mac_addr_len;
 
 	/* obtain emac clock from kernel */
 	emac_clk = devm_clk_get(&pdev->dev, NULL);
@@ -1815,8 +1810,22 @@ static int davinci_emac_probe(struct platform_device *pdev)
 		goto err_free_netdev;
 	}
 
+	cell = nvmem_cell_get(&pdev->dev, "mac-address");
+	if (!IS_ERR(cell)) {
+		mac_addr = nvmem_cell_read(cell, &mac_addr_len);
+		if (!IS_ERR(mac_addr)) {
+			if (is_valid_ether_addr(mac_addr)) {
+				dev_info(&pdev->dev,
+					 "Read MAC addr from EEPROM: %pM\n",
+					 mac_addr);
+				memcpy(priv->mac_addr, mac_addr, ETH_ALEN);
+			}
+			kfree(mac_addr);
+		}
+		nvmem_cell_put(cell);
+	}
+
 	/* 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;
 	priv->rmii_en = pdata->rmii_en;
 	priv->version = pdata->version;
-- 
2.17.1