diff options
| author | Calvin Johnson <calvin.johnson@oss.nxp.com> | 2021-06-11 13:53:57 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-06-11 13:08:53 -0700 |
| commit | 803ca24d2f92e2cf393df4705423f7b09a5eabd9 (patch) | |
| tree | e423fe2e3e00812975842ce8923c3c4c7e5bbcf2 /drivers/net/mdio | |
| parent | 7ec16433cf1e97cfc823e50e9ee4e2fd3abfc4ee (diff) | |
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>
Diffstat (limited to 'drivers/net/mdio')
| -rw-r--r-- | drivers/net/mdio/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/net/mdio/Makefile | 1 | ||||
| -rw-r--r-- | drivers/net/mdio/acpi_mdio.c | 58 |
3 files changed, 66 insertions, 0 deletions
diff --git a/drivers/net/mdio/Kconfig b/drivers/net/mdio/Kconfig index 422e9e042a3c..99a6c13a11af 100644 --- a/drivers/net/mdio/Kconfig +++ b/drivers/net/mdio/Kconfig @@ -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 diff --git a/drivers/net/mdio/Makefile b/drivers/net/mdio/Makefile index 2e6813c709eb..15f8dc4042ce 100644 --- a/drivers/net/mdio/Makefile +++ b/drivers/net/mdio/Makefile @@ -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 diff --git a/drivers/net/mdio/acpi_mdio.c b/drivers/net/mdio/acpi_mdio.c new file mode 100644 index 000000000000..d77c987fda9c --- /dev/null +++ b/drivers/net/mdio/acpi_mdio.c @@ -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); |