85 lines
2.6 KiB
Diff
85 lines
2.6 KiB
Diff
From 639dba857aa554f2a78572adc4cf3c32de9ec2e2 Mon Sep 17 00:00:00 2001
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From: Ansuel Smith <ansuelsmth@gmail.com>
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Date: Tue, 30 Mar 2021 18:21:14 +0200
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Subject: [PATCH 2/2] of_net: add mac-address-increment support
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Lots of embedded devices use the mac-address of other interface
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extracted from nvmem cells and increments it by one or two. Add two
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bindings to integrate this and directly use the right mac-address for
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the interface. Some example are some routers that use the gmac
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mac-address stored in the art partition and increments it by one for the
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wifi. mac-address-increment-byte bindings is used to tell what byte of
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the mac-address has to be increased (if not defined the last byte is
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increased) and mac-address-increment tells how much the byte decided
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early has to be increased.
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Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
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---
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drivers/of/of_net.c | 59 ++++++++++++++++++++++++++++++++++-----------
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1 file changed, 45 insertions(+), 14 deletions(-)
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--- a/drivers/of/of_net.c
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+++ b/drivers/of/of_net.c
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@@ -166,31 +166,56 @@ static int of_get_mac_address_mtd(struct
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* If a mtd-mac-address property exists, try to fetch the MAC address from the
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* specified mtd device.
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*
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+ * DT can tell the system to increment the mac-address after is extracted by
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+ * using:
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+ * - mac-address-increment-byte to decide what byte to increase
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+ * (if not defined is increased the last byte)
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+ * - mac-address-increment to decide how much to increase. The value will
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+ * not overflow to other bytes if the increment is over 255.
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+ * (example 00:01:02:03:04:ff + 1 == 00:01:02:03:04:00)
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+ *
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* Return: 0 on success and errno in case of error.
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*/
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int of_get_mac_address(struct device_node *np, u8 *addr)
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{
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+ u32 inc_idx, mac_inc;
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int ret;
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+ /* Check first if the increment byte is present and valid.
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+ * If not set assume to increment the last byte if found.
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+ */
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+ if (of_property_read_u32(np, "mac-address-increment-byte", &inc_idx))
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+ inc_idx = 5;
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+ if (inc_idx < 3 || inc_idx > 5)
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+ return -EINVAL;
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+
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if (!np)
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return -ENODEV;
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ret = of_get_mac_addr(np, "mac-address", addr);
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if (!ret)
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- return 0;
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+ goto found;
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ret = of_get_mac_addr(np, "local-mac-address", addr);
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if (!ret)
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- return 0;
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+ goto found;
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ret = of_get_mac_addr(np, "address", addr);
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if (!ret)
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- return 0;
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+ goto found;
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ret = of_get_mac_address_mtd(np, addr);
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if (!ret)
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- return 0;
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+ goto found;
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+
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+ ret = of_get_mac_addr_nvmem(np, addr);
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+ if (ret)
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+ return ret;
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+
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+found:
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+ if (!of_property_read_u32(np, "mac-address-increment", &mac_inc))
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+ addr[inc_idx] += mac_inc;
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- return of_get_mac_addr_nvmem(np, addr);
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+ return ret;
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}
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EXPORT_SYMBOL(of_get_mac_address);
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