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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/net/mdio/acpi_mdio.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/net/mdio/acpi_mdio.c')
-rw-r--r-- | drivers/net/mdio/acpi_mdio.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/drivers/net/mdio/acpi_mdio.c b/drivers/net/mdio/acpi_mdio.c new file mode 100644 index 000000000..4630dde01 --- /dev/null +++ b/drivers/net/mdio/acpi_mdio.c @@ -0,0 +1,60 @@ +// 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); |