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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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648ea01340
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 <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
/*
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* mdio-boardinfo - Collect pre-declarations for MDIO devices
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <linux/mutex.h>
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#include <linux/list.h>
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#include "mdio-boardinfo.h"
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static LIST_HEAD(mdio_board_list);
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static DEFINE_MUTEX(mdio_board_lock);
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/**
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* mdiobus_setup_mdiodev_from_board_info - create and setup MDIO devices
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* from pre-collected board specific MDIO information
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* @mdiodev: MDIO device pointer
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* Context: can sleep
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*/
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void mdiobus_setup_mdiodev_from_board_info(struct mii_bus *bus)
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{
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struct mdio_board_entry *be;
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struct mdio_device *mdiodev;
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struct mdio_board_info *bi;
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int ret;
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mutex_lock(&mdio_board_lock);
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list_for_each_entry(be, &mdio_board_list, list) {
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bi = &be->board_info;
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if (strcmp(bus->id, bi->bus_id))
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continue;
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mdiodev = mdio_device_create(bus, bi->mdio_addr);
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if (IS_ERR(mdiodev))
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continue;
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strncpy(mdiodev->modalias, bi->modalias,
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sizeof(mdiodev->modalias));
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mdiodev->bus_match = mdio_device_bus_match;
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mdiodev->dev.platform_data = (void *)bi->platform_data;
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ret = mdio_device_register(mdiodev);
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if (ret) {
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mdio_device_free(mdiodev);
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continue;
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}
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}
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mutex_unlock(&mdio_board_lock);
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}
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/**
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* mdio_register_board_info - register MDIO devices for a given board
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* @info: array of devices descriptors
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* @n: number of descriptors provided
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* Context: can sleep
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*
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* The board info passed can be marked with __initdata but be pointers
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* such as platform_data etc. are copied as-is
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*/
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int mdiobus_register_board_info(const struct mdio_board_info *info,
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unsigned int n)
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{
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struct mdio_board_entry *be;
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unsigned int i;
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be = kcalloc(n, sizeof(*be), GFP_KERNEL);
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if (!be)
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return -ENOMEM;
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for (i = 0; i < n; i++, be++, info++) {
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memcpy(&be->board_info, info, sizeof(*info));
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mutex_lock(&mdio_board_lock);
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list_add_tail(&be->list, &mdio_board_list);
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mutex_unlock(&mdio_board_lock);
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}
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return 0;
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}
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