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58 lines
1.7 KiB
58 lines
1.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* ACPI helpers for the MDIO (Ethernet PHY) API |
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* |
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* This file provides helper functions for extracting PHY device information |
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* out of the ACPI ASL and using it to populate an mii_bus. |
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*/ |
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#include <linux/acpi.h> |
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#include <linux/acpi_mdio.h> |
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#include <linux/bits.h> |
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#include <linux/dev_printk.h> |
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#include <linux/fwnode_mdio.h> |
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#include <linux/module.h> |
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#include <linux/types.h> |
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MODULE_AUTHOR("Calvin Johnson <[email protected]>"); |
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MODULE_LICENSE("GPL"); |
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/** |
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* acpi_mdiobus_register - Register mii_bus and create PHYs from the ACPI ASL. |
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* @mdio: pointer to mii_bus structure |
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* @fwnode: pointer to fwnode of MDIO bus. This fwnode is expected to represent |
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* an ACPI device object corresponding to the MDIO bus and its children are |
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* expected to correspond to the PHY devices on that bus. |
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* |
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* This function registers the mii_bus structure and registers a phy_device |
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* for each child node of @fwnode. |
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*/ |
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int acpi_mdiobus_register(struct mii_bus *mdio, struct fwnode_handle *fwnode) |
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{ |
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struct fwnode_handle *child; |
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u32 addr; |
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int ret; |
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/* Mask out all PHYs from auto probing. */ |
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mdio->phy_mask = GENMASK(31, 0); |
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ret = mdiobus_register(mdio); |
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if (ret) |
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return ret; |
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ACPI_COMPANION_SET(&mdio->dev, to_acpi_device_node(fwnode)); |
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/* Loop over the child nodes and register a phy_device for each PHY */ |
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fwnode_for_each_child_node(fwnode, child) { |
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ret = acpi_get_local_address(ACPI_HANDLE_FWNODE(child), &addr); |
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if (ret || addr >= PHY_MAX_ADDR) |
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continue; |
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ret = fwnode_mdiobus_register_phy(mdio, child, addr); |
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if (ret == -ENODEV) |
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dev_err(&mdio->dev, |
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"MDIO device at address %d is missing.\n", |
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addr); |
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} |
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return 0; |
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} |
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EXPORT_SYMBOL(acpi_mdiobus_register);
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