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