From f10843e04a075202dbb39dfcee047e3a2fdf5a8d Mon Sep 17 00:00:00 2001 From: Michael Walle Date: Mon, 12 Apr 2021 19:47:18 +0200 Subject: of: net: fix of_get_mac_addr_nvmem() for non-platform devices of_get_mac_address() already supports fetching the MAC address by an nvmem provider. But until now, it was just working for platform devices. Esp. it was not working for DSA ports and PCI devices. It gets more common that PCI devices have a device tree binding since SoCs contain integrated root complexes. Use the nvmem of_* binding to fetch the nvmem cells by a struct device_node. We still have to try to read the cell by device first because there might be a nvmem_cell_lookup associated with that device. Signed-off-by: Michael Walle Reviewed-by: Andrew Lunn Signed-off-by: David S. Miller --- drivers/of/of_net.c | 35 ++++++++++++++++++++++++++++++----- 1 file changed, 30 insertions(+), 5 deletions(-) --- a/drivers/of/of_net.c +++ b/drivers/of/of_net.c @@ -11,6 +11,7 @@ #include #include #include +#include /** * of_get_phy_mode - Get phy mode for given device_node @@ -59,15 +60,39 @@ static int of_get_mac_addr(struct device static int of_get_mac_addr_nvmem(struct device_node *np, u8 *addr) { struct platform_device *pdev = of_find_device_by_node(np); + struct nvmem_cell *cell; + const void *mac; + size_t len; int ret; - if (!pdev) - return -ENODEV; + /* Try lookup by device first, there might be a nvmem_cell_lookup + * associated with a given device. + */ + if (pdev) { + ret = nvmem_get_mac_address(&pdev->dev, addr); + put_device(&pdev->dev); + return ret; + } + + cell = of_nvmem_cell_get(np, "mac-address"); + if (IS_ERR(cell)) + return PTR_ERR(cell); + + mac = nvmem_cell_read(cell, &len); + nvmem_cell_put(cell); + + if (IS_ERR(mac)) + return PTR_ERR(mac); + + if (len != ETH_ALEN || !is_valid_ether_addr(mac)) { + kfree(mac); + return -EINVAL; + } - ret = nvmem_get_mac_address(&pdev->dev, addr); - put_device(&pdev->dev); + memcpy(addr, mac, ETH_ALEN); + kfree(mac); - return ret; + return 0; } /**