Commit 803ca24d authored by Calvin Johnson's avatar Calvin Johnson Committed by David S. Miller
Browse files

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: default avatarCalvin Johnson <calvin.johnson@oss.nxp.com>
Signed-off-by: default avatarIoana Ciornei <ioana.ciornei@nxp.com>
Acked-by: default avatarRafael J. Wysocki <rafael@kernel.org>
Acked-by: default avatarGrant Likely <grant.likely@arm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7ec16433

MAINTAINERS

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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/

drivers/net/mdio/Kconfig

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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

drivers/net/mdio/Makefile

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# 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

drivers/net/mdio/acpi_mdio.c

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// 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);

include/linux/acpi_mdio.h

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/* 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 */