diff options
| -rw-r--r-- | include/fdtdec.h | 24 | ||||
| -rw-r--r-- | lib/fdtdec.c | 29 |
2 files changed, 53 insertions, 0 deletions
diff --git a/include/fdtdec.h b/include/fdtdec.h index fa8e34f6f9..e6c22dd5cd 100644 --- a/include/fdtdec.h +++ b/include/fdtdec.h @@ -997,6 +997,30 @@ int fdtdec_setup_memory_banksize_fdt(const void *blob); int fdtdec_setup_memory_banksize(void); /** + * fdtdec_set_ethernet_mac_address() - set MAC address for default interface + * + * Looks up the default interface via the "ethernet" alias (in the /aliases + * node) and stores the given MAC in its "local-mac-address" property. This + * is useful on platforms that store the MAC address in a custom location. + * Board code can call this in the late init stage to make sure that the + * interface device tree node has the right MAC address configured for the + * Ethernet uclass to pick it up. + * + * Typically the FDT passed into this function will be U-Boot's control DTB. + * Given that a lot of code may be holding offsets to various nodes in that + * tree, this code will only set the "local-mac-address" property in-place, + * which means that it needs to exist and have space for the 6-byte address. + * This ensures that the operation is non-destructive and does not invalidate + * offsets that other drivers may be using. + * + * @param fdt FDT blob + * @param mac buffer containing the MAC address to set + * @param size size of MAC address + * @return 0 on success or a negative error code on failure + */ +int fdtdec_set_ethernet_mac_address(void *fdt, const u8 *mac, size_t size); + +/** * fdtdec_set_phandle() - sets the phandle of a given node * * @param blob FDT blob diff --git a/lib/fdtdec.c b/lib/fdtdec.c index d0ba888973..3ee786b579 100644 --- a/lib/fdtdec.c +++ b/lib/fdtdec.c @@ -1261,6 +1261,35 @@ __weak void *board_fdt_blob_setup(void) } #endif +int fdtdec_set_ethernet_mac_address(void *fdt, const u8 *mac, size_t size) +{ + const char *path; + int offset, err; + + if (!is_valid_ethaddr(mac)) + return -EINVAL; + + path = fdt_get_alias(fdt, "ethernet"); + if (!path) + return 0; + + debug("ethernet alias found: %s\n", path); + + offset = fdt_path_offset(fdt, path); + if (offset < 0) { + debug("ethernet alias points to absent node %s\n", path); + return -ENOENT; + } + + err = fdt_setprop_inplace(fdt, offset, "local-mac-address", mac, size); + if (err < 0) + return err; + + debug("MAC address: %pM\n", mac); + + return 0; +} + static int fdtdec_init_reserved_memory(void *blob) { int na, ns, node, err; |