| // 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); |