61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
// 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
|
|
* @owner: module owning this @mdio object.
|
|
* 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 module *owner)
|
|
{
|
|
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, owner);
|
|
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);
|