1/* 2 * OF helpers for network devices. 3 * 4 * This file is released under the GPLv2 5 * 6 * Initially copied out of arch/powerpc/kernel/prom_parse.c 7 */ 8#include <linux/etherdevice.h> 9#include <linux/kernel.h> 10#include <linux/of_net.h> 11#include <linux/phy.h> 12#include <linux/export.h> 13 14/** 15 * It maps 'enum phy_interface_t' found in include/linux/phy.h 16 * into the device tree binding of 'phy-mode', so that Ethernet 17 * device driver can get phy interface from device tree. 18 */ 19static const char *phy_modes[] = { 20 [PHY_INTERFACE_MODE_NA] = "", 21 [PHY_INTERFACE_MODE_MII] = "mii", 22 [PHY_INTERFACE_MODE_GMII] = "gmii", 23 [PHY_INTERFACE_MODE_SGMII] = "sgmii", 24 [PHY_INTERFACE_MODE_TBI] = "tbi", 25 [PHY_INTERFACE_MODE_RMII] = "rmii", 26 [PHY_INTERFACE_MODE_RGMII] = "rgmii", 27 [PHY_INTERFACE_MODE_RGMII_ID] = "rgmii-id", 28 [PHY_INTERFACE_MODE_RGMII_RXID] = "rgmii-rxid", 29 [PHY_INTERFACE_MODE_RGMII_TXID] = "rgmii-txid", 30 [PHY_INTERFACE_MODE_RTBI] = "rtbi", 31 [PHY_INTERFACE_MODE_SMII] = "smii", 32}; 33 34/** 35 * of_get_phy_mode - Get phy mode for given device_node 36 * @np: Pointer to the given device_node 37 * 38 * The function gets phy interface string from property 'phy-mode', 39 * and return its index in phy_modes table, or errno in error case. 40 */ 41const int of_get_phy_mode(struct device_node *np) 42{ 43 const char *pm; 44 int err, i; 45 46 err = of_property_read_string(np, "phy-mode", &pm); 47 if (err < 0) 48 return err; 49 50 for (i = 0; i < ARRAY_SIZE(phy_modes); i++) 51 if (!strcasecmp(pm, phy_modes[i])) 52 return i; 53 54 return -ENODEV; 55} 56EXPORT_SYMBOL_GPL(of_get_phy_mode); 57 58/** 59 * Search the device tree for the best MAC address to use. 'mac-address' is 60 * checked first, because that is supposed to contain to "most recent" MAC 61 * address. If that isn't set, then 'local-mac-address' is checked next, 62 * because that is the default address. If that isn't set, then the obsolete 63 * 'address' is checked, just in case we're using an old device tree. 64 * 65 * Note that the 'address' property is supposed to contain a virtual address of 66 * the register set, but some DTS files have redefined that property to be the 67 * MAC address. 68 * 69 * All-zero MAC addresses are rejected, because those could be properties that 70 * exist in the device tree, but were not set by U-Boot. For example, the 71 * DTS could define 'mac-address' and 'local-mac-address', with zero MAC 72 * addresses. Some older U-Boots only initialized 'local-mac-address'. In 73 * this case, the real MAC is in 'local-mac-address', and 'mac-address' exists 74 * but is all zeros. 75*/ 76const void *of_get_mac_address(struct device_node *np) 77{ 78 struct property *pp; 79 80 pp = of_find_property(np, "mac-address", NULL); 81 if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value)) 82 return pp->value; 83 84 pp = of_find_property(np, "local-mac-address", NULL); 85 if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value)) 86 return pp->value; 87 88 pp = of_find_property(np, "address", NULL); 89 if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value)) 90 return pp->value; 91 92 return NULL; 93} 94EXPORT_SYMBOL(of_get_mac_address); 95