59 lines
1.7 KiB
C
59 lines
1.7 KiB
C
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// 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 <calvin.johnson@oss.nxp.com>");
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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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