net: mdio: Add ACPI support code for mdio

Define acpi_mdiobus_register() to Register mii_bus and create PHYs for
each ACPI child node.

Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Acked-by: Grant Likely <grant.likely@arm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Calvin Johnson 2021-06-11 13:53:57 +03:00 committed by David S. Miller
parent 7ec16433cf
commit 803ca24d2f
5 changed files with 93 additions and 0 deletions

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@ -6811,6 +6811,7 @@ F: Documentation/devicetree/bindings/net/mdio*
F: Documentation/devicetree/bindings/net/qca,ar803x.yaml
F: Documentation/networking/phy.rst
F: drivers/net/mdio/
F: drivers/net/mdio/acpi_mdio.c
F: drivers/net/mdio/fwnode_mdio.c
F: drivers/net/mdio/of_mdio.c
F: drivers/net/pcs/

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@ -34,6 +34,13 @@ config OF_MDIO
help
OpenFirmware MDIO bus (Ethernet PHY) accessors
config ACPI_MDIO
def_tristate PHYLIB
depends on ACPI
depends on PHYLIB
help
ACPI MDIO bus (Ethernet PHY) accessors
if MDIO_BUS
config MDIO_DEVRES

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@ -1,6 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
# Makefile for Linux MDIO bus drivers
obj-$(CONFIG_ACPI_MDIO) += acpi_mdio.o
obj-$(CONFIG_FWNODE_MDIO) += fwnode_mdio.o
obj-$(CONFIG_OF_MDIO) += of_mdio.o

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@ -0,0 +1,58 @@
// 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);

26
include/linux/acpi_mdio.h Normal file
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@ -0,0 +1,26 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* ACPI helper for the MDIO (Ethernet PHY) API
*/
#ifndef __LINUX_ACPI_MDIO_H
#define __LINUX_ACPI_MDIO_H
#include <linux/phy.h>
#if IS_ENABLED(CONFIG_ACPI_MDIO)
int acpi_mdiobus_register(struct mii_bus *mdio, struct fwnode_handle *fwnode);
#else /* CONFIG_ACPI_MDIO */
static inline int
acpi_mdiobus_register(struct mii_bus *mdio, struct fwnode_handle *fwnode)
{
/*
* Fall back to mdiobus_register() function to register a bus.
* This way, we don't have to keep compat bits around in drivers.
*/
return mdiobus_register(mdio);
}
#endif
#endif /* __LINUX_ACPI_MDIO_H */