From 648ea0134069cda7d4940f397bcc6901fb88752a Mon Sep 17 00:00:00 2001 From: Florian Fainelli Date: Sat, 4 Feb 2017 13:02:44 -0800 Subject: net: phy: Allow pre-declaration of MDIO devices Allow board support code to collect pre-declarations for MDIO devices by registering them with mdiobus_register_board_info(). SPI and I2C buses have a similar feature, we were missing this for MDIO devices, but this is particularly useful for e.g: MDIO-connected switches which need to provide their port layout (often board-specific) to a MDIO Ethernet switch driver. Signed-off-by: Florian Fainelli Signed-off-by: David S. Miller --- drivers/net/phy/mdio-boardinfo.c | 86 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 86 insertions(+) create mode 100644 drivers/net/phy/mdio-boardinfo.c (limited to 'drivers/net/phy/mdio-boardinfo.c') diff --git a/drivers/net/phy/mdio-boardinfo.c b/drivers/net/phy/mdio-boardinfo.c new file mode 100644 index 000000000000..6b988f77da08 --- /dev/null +++ b/drivers/net/phy/mdio-boardinfo.c @@ -0,0 +1,86 @@ +/* + * mdio-boardinfo - Collect pre-declarations for MDIO devices + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + */ + +#include +#include +#include +#include +#include + +#include "mdio-boardinfo.h" + +static LIST_HEAD(mdio_board_list); +static DEFINE_MUTEX(mdio_board_lock); + +/** + * mdiobus_setup_mdiodev_from_board_info - create and setup MDIO devices + * from pre-collected board specific MDIO information + * @mdiodev: MDIO device pointer + * Context: can sleep + */ +void mdiobus_setup_mdiodev_from_board_info(struct mii_bus *bus) +{ + struct mdio_board_entry *be; + struct mdio_device *mdiodev; + struct mdio_board_info *bi; + int ret; + + mutex_lock(&mdio_board_lock); + list_for_each_entry(be, &mdio_board_list, list) { + bi = &be->board_info; + + if (strcmp(bus->id, bi->bus_id)) + continue; + + mdiodev = mdio_device_create(bus, bi->mdio_addr); + if (IS_ERR(mdiodev)) + continue; + + strncpy(mdiodev->modalias, bi->modalias, + sizeof(mdiodev->modalias)); + mdiodev->bus_match = mdio_device_bus_match; + mdiodev->dev.platform_data = (void *)bi->platform_data; + + ret = mdio_device_register(mdiodev); + if (ret) { + mdio_device_free(mdiodev); + continue; + } + } + mutex_unlock(&mdio_board_lock); +} + +/** + * mdio_register_board_info - register MDIO devices for a given board + * @info: array of devices descriptors + * @n: number of descriptors provided + * Context: can sleep + * + * The board info passed can be marked with __initdata but be pointers + * such as platform_data etc. are copied as-is + */ +int mdiobus_register_board_info(const struct mdio_board_info *info, + unsigned int n) +{ + struct mdio_board_entry *be; + unsigned int i; + + be = kcalloc(n, sizeof(*be), GFP_KERNEL); + if (!be) + return -ENOMEM; + + for (i = 0; i < n; i++, be++, info++) { + memcpy(&be->board_info, info, sizeof(*info)); + mutex_lock(&mdio_board_lock); + list_add_tail(&be->list, &mdio_board_list); + mutex_unlock(&mdio_board_lock); + } + + return 0; +} -- cgit v1.2.3