linux-kernel - [PATCH net-next 3/3] net: implement nvmem-mac-address-offset DT property

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Date:   Wed, 14 Apr 2021 17:26:57 +0200
From:   Michael Walle <michael@...le.cc>
To:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Frank Rowand <frowand.list@...il.com>,
        Michael Walle <michael@...le.cc>
Subject: [PATCH net-next 3/3] net: implement nvmem-mac-address-offset DT property

The MAC address fetched by an NVMEM provider might have an offset to it.
Add the support for it in nvmem_get_mac_address().

Signed-off-by: Michael Walle <michael@...le.cc>
---
 drivers/of/of_net.c | 4 ++++
 net/ethernet/eth.c  | 5 +++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/of/of_net.c b/drivers/of/of_net.c
index dbac3a172a11..60c6048a823a 100644
--- a/drivers/of/of_net.c
+++ b/drivers/of/of_net.c
@@ -63,6 +63,7 @@ static int of_get_mac_addr_nvmem(struct device_node *np, u8 *addr)
 	struct nvmem_cell *cell;
 	const void *mac;
 	size_t len;
+	u32 offset;
 	int ret;
 
 	/* Try lookup by device first, there might be a nvmem_cell_lookup
@@ -92,6 +93,9 @@ static int of_get_mac_addr_nvmem(struct device_node *np, u8 *addr)
 	memcpy(addr, mac, ETH_ALEN);
 	kfree(mac);
 
+	if (!of_property_read_u32(np, "nvmem-mac-address-offset", &offset))
+		eth_addr_add(addr, offset);
+
 	return 0;
 }
 
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index 9cce612e8976..fe5311f614fe 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -541,6 +541,7 @@ int nvmem_get_mac_address(struct device *dev, void *addrbuf)
 {
 	struct nvmem_cell *cell;
 	const void *mac;
+	u32 offset;
 	size_t len;
 
 	cell = nvmem_cell_get(dev, "mac-address");
@@ -561,6 +562,10 @@ int nvmem_get_mac_address(struct device *dev, void *addrbuf)
 	ether_addr_copy(addrbuf, mac);
 	kfree(mac);
 
+	if (!device_property_read_u32(dev, "nvmem-mac-address-offset",
+				      &offset))
+		eth_addr_add(addrbuf, offset);
+
 	return 0;
 }
 EXPORT_SYMBOL(nvmem_get_mac_address);
-- 
2.20.1