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Wysocki" , Jeremy Linton , Andrew Lunn , Andy Shevchenko , Florian Fainelli , Russell King - ARM Linux admin , Cristi Sovaiala , Florin Laurentiu Chiculita , Ioana Ciornei , Madalin Bucur , Heikki Krogerus , Marcin Wojtas , Pieter Jansen Van Vuuren , Jon , Saravana Kannan , Randy Dunlap Subject: [net-next PATCH v5 10/15] net: mdio: Add ACPI support code for mdio Date: Mon, 8 Feb 2021 20:42:39 +0530 Message-Id: <20210208151244.16338-11-calvin.johnson@oss.nxp.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210208151244.16338-1-calvin.johnson@oss.nxp.com> References: <20210208151244.16338-1-calvin.johnson@oss.nxp.com> X-Originating-IP: [14.142.151.118] X-ClientProxiedBy: SG2PR04CA0176.apcprd04.prod.outlook.com (2603:1096:4:14::14) To AM0PR04MB5636.eurprd04.prod.outlook.com (2603:10a6:208:130::22) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from lsv03152.swis.in-blr01.nxp.com (14.142.151.118) by SG2PR04CA0176.apcprd04.prod.outlook.com (2603:1096:4:14::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3825.19 via Frontend Transport; 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Miller" , linux-arm-kernel@lists.infradead.org, Laurentiu Tudor Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Define acpi_mdiobus_register() to Register mii_bus and create PHYs for each ACPI child node. Signed-off-by: Calvin Johnson --- Changes in v5: - add missing MODULE_LICENSE() - replace fwnode_get_id() with OF and ACPI function calls Changes in v4: None Changes in v3: None Changes in v2: None MAINTAINERS | 1 + drivers/net/mdio/Kconfig | 7 +++++ drivers/net/mdio/Makefile | 1 + drivers/net/mdio/acpi_mdio.c | 51 ++++++++++++++++++++++++++++++++++++ include/linux/acpi_mdio.h | 27 +++++++++++++++++++ 5 files changed, 87 insertions(+) create mode 100644 drivers/net/mdio/acpi_mdio.c create mode 100644 include/linux/acpi_mdio.h diff --git a/MAINTAINERS b/MAINTAINERS index 47a5e683ebfe..ead71f60607d 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -6669,6 +6669,7 @@ 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/of_mdio.c F: drivers/net/pcs/ F: drivers/net/phy/ diff --git a/drivers/net/mdio/Kconfig b/drivers/net/mdio/Kconfig index a10cc460d7cf..df6bb7837d6a 100644 --- a/drivers/net/mdio/Kconfig +++ b/drivers/net/mdio/Kconfig @@ -27,6 +27,13 @@ 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 5c498dde463f..2373ade8af13 100644 --- a/drivers/net/mdio/Makefile +++ b/drivers/net/mdio/Makefile @@ -2,6 +2,7 @@ # Makefile for Linux MDIO bus drivers obj-$(CONFIG_OF_MDIO) += of_mdio.o +obj-$(CONFIG_ACPI_MDIO) += acpi_mdio.o obj-$(CONFIG_MDIO_ASPEED) += mdio-aspeed.o obj-$(CONFIG_MDIO_BCM_IPROC) += mdio-bcm-iproc.o diff --git a/drivers/net/mdio/acpi_mdio.c b/drivers/net/mdio/acpi_mdio.c new file mode 100644 index 000000000000..7859f2f3352b --- /dev/null +++ b/drivers/net/mdio/acpi_mdio.c @@ -0,0 +1,51 @@ +// 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 +#include + +MODULE_AUTHOR("Calvin Johnson "); +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 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 = ~0; + ret = mdiobus_register(mdio); + if (ret) + return ret; + + mdio->dev.fwnode = 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); diff --git a/include/linux/acpi_mdio.h b/include/linux/acpi_mdio.h new file mode 100644 index 000000000000..9be6f63cde8f --- /dev/null +++ b/include/linux/acpi_mdio.h @@ -0,0 +1,27 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * ACPI helpers for the MDIO (Ethernet PHY) API + * + */ + +#ifndef __LINUX_ACPI_MDIO_H +#define __LINUX_ACPI_MDIO_H + +#include +#include + +#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 */