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121 lines
3.4 KiB
121 lines
3.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* OF helpers for network devices. |
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* |
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* Initially copied out of arch/powerpc/kernel/prom_parse.c |
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*/ |
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#include <linux/etherdevice.h> |
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#include <linux/kernel.h> |
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#include <linux/of_net.h> |
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#include <linux/of_platform.h> |
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#include <linux/phy.h> |
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#include <linux/export.h> |
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#include <linux/device.h> |
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/** |
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* of_get_phy_mode - Get phy mode for given device_node |
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* @np: Pointer to the given device_node |
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* @interface: Pointer to the result |
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* |
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* The function gets phy interface string from property 'phy-mode' or |
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* 'phy-connection-type'. The index in phy_modes table is set in |
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* interface and 0 returned. In case of error interface is set to |
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* PHY_INTERFACE_MODE_NA and an errno is returned, e.g. -ENODEV. |
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*/ |
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int of_get_phy_mode(struct device_node *np, phy_interface_t *interface) |
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{ |
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const char *pm; |
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int err, i; |
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*interface = PHY_INTERFACE_MODE_NA; |
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err = of_property_read_string(np, "phy-mode", &pm); |
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if (err < 0) |
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err = of_property_read_string(np, "phy-connection-type", &pm); |
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if (err < 0) |
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return err; |
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for (i = 0; i < PHY_INTERFACE_MODE_MAX; i++) |
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if (!strcasecmp(pm, phy_modes(i))) { |
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*interface = i; |
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return 0; |
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} |
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return -ENODEV; |
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} |
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EXPORT_SYMBOL_GPL(of_get_phy_mode); |
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static const void *of_get_mac_addr(struct device_node *np, const char *name) |
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{ |
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struct property *pp = of_find_property(np, name, NULL); |
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if (pp && pp->length == ETH_ALEN && is_valid_ether_addr(pp->value)) |
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return pp->value; |
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return NULL; |
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} |
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static const void *of_get_mac_addr_nvmem(struct device_node *np) |
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{ |
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int ret; |
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const void *mac; |
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u8 nvmem_mac[ETH_ALEN]; |
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struct platform_device *pdev = of_find_device_by_node(np); |
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if (!pdev) |
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return ERR_PTR(-ENODEV); |
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ret = nvmem_get_mac_address(&pdev->dev, &nvmem_mac); |
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if (ret) { |
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put_device(&pdev->dev); |
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return ERR_PTR(ret); |
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} |
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mac = devm_kmemdup(&pdev->dev, nvmem_mac, ETH_ALEN, GFP_KERNEL); |
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put_device(&pdev->dev); |
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if (!mac) |
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return ERR_PTR(-ENOMEM); |
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return mac; |
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} |
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/** |
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* Search the device tree for the best MAC address to use. 'mac-address' is |
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* checked first, because that is supposed to contain to "most recent" MAC |
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* address. If that isn't set, then 'local-mac-address' is checked next, |
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* because that is the default address. If that isn't set, then the obsolete |
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* 'address' is checked, just in case we're using an old device tree. If any |
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* of the above isn't set, then try to get MAC address from nvmem cell named |
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* 'mac-address'. |
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* |
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* Note that the 'address' property is supposed to contain a virtual address of |
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* the register set, but some DTS files have redefined that property to be the |
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* MAC address. |
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* |
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* All-zero MAC addresses are rejected, because those could be properties that |
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* exist in the device tree, but were not set by U-Boot. For example, the |
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* DTS could define 'mac-address' and 'local-mac-address', with zero MAC |
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* addresses. Some older U-Boots only initialized 'local-mac-address'. In |
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* this case, the real MAC is in 'local-mac-address', and 'mac-address' exists |
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* but is all zeros. |
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* |
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* Return: Will be a valid pointer on success and ERR_PTR in case of error. |
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*/ |
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const void *of_get_mac_address(struct device_node *np) |
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{ |
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const void *addr; |
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addr = of_get_mac_addr(np, "mac-address"); |
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if (addr) |
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return addr; |
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addr = of_get_mac_addr(np, "local-mac-address"); |
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if (addr) |
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return addr; |
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addr = of_get_mac_addr(np, "address"); |
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if (addr) |
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return addr; |
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return of_get_mac_addr_nvmem(np); |
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} |
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EXPORT_SYMBOL(of_get_mac_address);
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