2007-05-03 00:38:57 +08:00
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/*
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* Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
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* <benh@kernel.crashing.org>
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* and Arnd Bergmann, IBM Corp.
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* Merged from powerpc/kernel/of_platform.c and
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* sparc{,64}/kernel/of_device.c by Stephen Rothwell
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <linux/errno.h>
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2007-10-18 12:17:42 +08:00
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#include <linux/module.h>
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2011-06-22 00:59:34 +08:00
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#include <linux/amba/bus.h>
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2007-05-03 00:38:57 +08:00
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#include <linux/device.h>
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2010-06-08 21:48:13 +08:00
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#include <linux/dma-mapping.h>
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2010-06-08 21:48:20 +08:00
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#include <linux/slab.h>
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2010-06-08 21:48:26 +08:00
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#include <linux/of_address.h>
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2007-05-03 00:38:57 +08:00
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#include <linux/of_device.h>
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2010-06-08 21:48:26 +08:00
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#include <linux/of_irq.h>
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2007-05-03 00:38:57 +08:00
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#include <linux/of_platform.h>
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2010-06-08 21:48:21 +08:00
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#include <linux/platform_device.h>
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2011-06-22 00:59:34 +08:00
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const struct of_device_id of_default_bus_match_table[] = {
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{ .compatible = "simple-bus", },
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#ifdef CONFIG_ARM_AMBA
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{ .compatible = "arm,amba-bus", },
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#endif /* CONFIG_ARM_AMBA */
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{} /* Empty terminated list */
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};
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2010-07-24 01:19:35 +08:00
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static int of_dev_node_match(struct device *dev, void *data)
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{
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return dev->of_node == data;
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}
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/**
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* of_find_device_by_node - Find the platform_device associated with a node
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* @np: Pointer to device tree node
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*
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* Returns platform_device pointer, or NULL if not found
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*/
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struct platform_device *of_find_device_by_node(struct device_node *np)
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{
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struct device *dev;
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dev = bus_find_device(&platform_bus_type, NULL, np, of_dev_node_match);
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return dev ? to_platform_device(dev) : NULL;
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}
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EXPORT_SYMBOL(of_find_device_by_node);
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2012-02-25 05:58:34 +08:00
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#ifdef CONFIG_OF_ADDRESS
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2010-06-08 21:48:13 +08:00
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/*
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* The following routines scan a subtree and registers a device for
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* each applicable node.
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*
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* Note: sparc doesn't use these routines because it has a different
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* mechanism for creating devices from device tree nodes.
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*/
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2010-06-08 21:48:14 +08:00
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/**
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* of_device_make_bus_id - Use the device node data to assign a unique name
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* @dev: pointer to device structure that is linked to a device tree node
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*
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2014-05-21 14:40:31 +08:00
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* This routine will first try using the translated bus address to
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* derive a unique name. If it cannot, then it will prepend names from
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* parent nodes until a unique name can be derived.
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2010-06-08 21:48:14 +08:00
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*/
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2010-07-24 05:04:01 +08:00
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void of_device_make_bus_id(struct device *dev)
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2010-06-08 21:48:14 +08:00
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{
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struct device_node *node = dev->of_node;
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2012-10-09 08:42:11 +08:00
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const __be32 *reg;
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2010-06-08 21:48:14 +08:00
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u64 addr;
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2014-05-21 14:40:31 +08:00
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/* Construct the name, using parent nodes if necessary to ensure uniqueness */
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while (node->parent) {
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/*
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* If the address can be translated, then that is as much
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* uniqueness as we need. Make it the first component and return
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*/
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reg = of_get_property(node, "reg", NULL);
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if (reg && (addr = of_translate_address(node, reg)) != OF_BAD_ADDR) {
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dev_set_name(dev, dev_name(dev) ? "%llx.%s:%s" : "%llx.%s",
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(unsigned long long)addr, node->name,
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dev_name(dev));
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2010-06-08 21:48:14 +08:00
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return;
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}
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2014-05-21 14:40:31 +08:00
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/* format arguments only used if dev_name() resolves to NULL */
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dev_set_name(dev, dev_name(dev) ? "%s:%s" : "%s",
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strrchr(node->full_name, '/') + 1, dev_name(dev));
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node = node->parent;
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}
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2010-06-08 21:48:14 +08:00
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}
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/**
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* of_device_alloc - Allocate and initialize an of_device
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* @np: device node to assign to device
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* @bus_id: Name to assign to the device. May be null to use default name.
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* @parent: Parent device.
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*/
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2010-07-23 03:59:23 +08:00
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struct platform_device *of_device_alloc(struct device_node *np,
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2010-06-08 21:48:14 +08:00
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const char *bus_id,
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struct device *parent)
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{
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2010-07-23 03:59:23 +08:00
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struct platform_device *dev;
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2010-10-11 11:35:05 +08:00
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int rc, i, num_reg = 0, num_irq;
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2010-06-08 21:48:15 +08:00
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struct resource *res, temp_res;
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2010-10-21 01:45:13 +08:00
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dev = platform_device_alloc("", -1);
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if (!dev)
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return NULL;
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/* count the io and irq resources */
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2014-05-08 04:23:56 +08:00
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while (of_address_to_resource(np, num_reg, &temp_res) == 0)
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num_reg++;
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2010-10-11 11:35:05 +08:00
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num_irq = of_irq_count(np);
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2010-06-08 21:48:15 +08:00
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/* Populate the resource table */
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if (num_irq || num_reg) {
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2010-10-21 01:45:13 +08:00
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res = kzalloc(sizeof(*res) * (num_irq + num_reg), GFP_KERNEL);
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if (!res) {
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platform_device_put(dev);
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return NULL;
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}
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2010-06-08 21:48:15 +08:00
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dev->num_resources = num_reg + num_irq;
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dev->resource = res;
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for (i = 0; i < num_reg; i++, res++) {
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rc = of_address_to_resource(np, i, res);
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WARN_ON(rc);
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}
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2014-04-24 06:57:41 +08:00
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if (of_irq_to_resource_table(np, res, num_irq) != num_irq)
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pr_debug("not all legacy IRQ resources mapped for %s\n",
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np->name);
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2010-06-08 21:48:15 +08:00
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}
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2010-06-08 21:48:14 +08:00
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dev->dev.of_node = of_node_get(np);
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2014-11-04 18:26:26 +08:00
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dev->dev.parent = parent ? : &platform_bus;
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2010-06-08 21:48:14 +08:00
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if (bus_id)
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dev_set_name(&dev->dev, "%s", bus_id);
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else
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of_device_make_bus_id(&dev->dev);
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return dev;
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}
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EXPORT_SYMBOL(of_device_alloc);
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2014-04-24 23:30:04 +08:00
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/**
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* of_dma_configure - Setup DMA configuration
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* @dev: Device to apply DMA configuration
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*
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* Try to get devices's DMA configuration from DT and update it
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* accordingly.
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*
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* In case if platform code need to use own special DMA configuration,it
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* can use Platform bus notifier and handle BUS_NOTIFY_ADD_DEVICE event
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* to fix up DMA configuration.
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*/
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2014-09-17 19:56:07 +08:00
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static void of_dma_configure(struct device *dev)
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2014-04-24 23:30:04 +08:00
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{
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u64 dma_addr, paddr, size;
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int ret;
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/*
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* Set default dma-mask to 32 bit. Drivers are expected to setup
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* the correct supported dma_mask.
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*/
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dev->coherent_dma_mask = DMA_BIT_MASK(32);
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/*
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* Set it to coherent_dma_mask by default if the architecture
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* code has not set it.
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*/
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if (!dev->dma_mask)
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dev->dma_mask = &dev->coherent_dma_mask;
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/*
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* if dma-coherent property exist, call arch hook to setup
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* dma coherent operations.
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*/
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if (of_dma_is_coherent(dev->of_node)) {
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set_arch_dma_coherent_ops(dev);
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dev_dbg(dev, "device is dma coherent\n");
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}
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/*
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* if dma-ranges property doesn't exist - just return else
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* setup the dma offset
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*/
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ret = of_dma_get_range(dev->of_node, &dma_addr, &paddr, &size);
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if (ret < 0) {
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dev_dbg(dev, "no dma range information to setup\n");
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return;
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}
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/* DMA ranges found. Calculate and set dma_pfn_offset */
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dev->dma_pfn_offset = PFN_DOWN(paddr - dma_addr);
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dev_dbg(dev, "dma_pfn_offset(%#08lx)\n", dev->dma_pfn_offset);
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}
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|
2010-06-08 21:48:13 +08:00
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/**
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2011-06-22 00:59:35 +08:00
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* of_platform_device_create_pdata - Alloc, initialize and register an of_device
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2010-06-08 21:48:13 +08:00
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* @np: pointer to node to create device for
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* @bus_id: name to assign device
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2011-06-22 00:59:35 +08:00
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* @platform_data: pointer to populate platform_data pointer with
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2010-06-08 21:48:13 +08:00
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* @parent: Linux device model parent device.
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2011-01-04 06:51:11 +08:00
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*
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* Returns pointer to created platform device, or NULL if a device was not
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* registered. Unavailable devices will not get registered.
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2010-06-08 21:48:13 +08:00
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*/
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2013-07-02 03:26:52 +08:00
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static struct platform_device *of_platform_device_create_pdata(
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2011-06-22 00:59:35 +08:00
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struct device_node *np,
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const char *bus_id,
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void *platform_data,
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struct device *parent)
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2010-06-08 21:48:13 +08:00
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{
|
2010-07-23 03:59:23 +08:00
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struct platform_device *dev;
|
2010-06-08 21:48:13 +08:00
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2014-05-15 23:55:24 +08:00
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if (!of_device_is_available(np) ||
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of_node_test_and_set_flag(np, OF_POPULATED))
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2011-01-04 06:51:11 +08:00
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return NULL;
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|
2010-06-08 21:48:13 +08:00
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dev = of_device_alloc(np, bus_id, parent);
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if (!dev)
|
2014-05-15 23:55:24 +08:00
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goto err_clear_flag;
|
2010-06-08 21:48:13 +08:00
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|
2014-09-17 19:56:07 +08:00
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of_dma_configure(&dev->dev);
|
2010-06-08 21:48:21 +08:00
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dev->dev.bus = &platform_bus_type;
|
2011-06-22 00:59:35 +08:00
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dev->dev.platform_data = platform_data;
|
2010-06-08 21:48:13 +08:00
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/* We do not fill the DMA ops for platform devices by default.
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* This is currently the responsibility of the platform code
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* to do such, possibly using a device notifier
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*/
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2010-10-21 01:45:13 +08:00
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if (of_device_add(dev) != 0) {
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platform_device_put(dev);
|
2014-05-15 23:55:24 +08:00
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goto err_clear_flag;
|
2010-06-08 21:48:13 +08:00
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}
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return dev;
|
2014-05-15 23:55:24 +08:00
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err_clear_flag:
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of_node_clear_flag(np, OF_POPULATED);
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return NULL;
|
2010-06-08 21:48:13 +08:00
|
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}
|
2011-06-22 00:59:35 +08:00
|
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|
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/**
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* of_platform_device_create - Alloc, initialize and register an of_device
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* @np: pointer to node to create device for
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* @bus_id: name to assign device
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* @parent: Linux device model parent device.
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*
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* Returns pointer to created platform device, or NULL if a device was not
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* registered. Unavailable devices will not get registered.
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*/
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struct platform_device *of_platform_device_create(struct device_node *np,
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const char *bus_id,
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struct device *parent)
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|
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{
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return of_platform_device_create_pdata(np, bus_id, NULL, parent);
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|
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}
|
2010-06-08 21:48:13 +08:00
|
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EXPORT_SYMBOL(of_platform_device_create);
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|
|
|
2011-06-22 00:59:34 +08:00
|
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|
#ifdef CONFIG_ARM_AMBA
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static struct amba_device *of_amba_device_create(struct device_node *node,
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|
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const char *bus_id,
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|
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void *platform_data,
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|
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struct device *parent)
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|
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{
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struct amba_device *dev;
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const void *prop;
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int i, ret;
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|
|
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pr_debug("Creating amba device %s\n", node->full_name);
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|
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|
2014-05-15 23:55:24 +08:00
|
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if (!of_device_is_available(node) ||
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of_node_test_and_set_flag(node, OF_POPULATED))
|
2011-06-22 00:59:34 +08:00
|
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return NULL;
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|
|
|
2011-12-18 19:45:17 +08:00
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|
dev = amba_device_alloc(NULL, 0, 0);
|
2013-08-30 19:17:29 +08:00
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|
if (!dev) {
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|
pr_err("%s(): amba_device_alloc() failed for %s\n",
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|
|
__func__, node->full_name);
|
2014-05-15 23:55:24 +08:00
|
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|
goto err_clear_flag;
|
2013-08-30 19:17:29 +08:00
|
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|
}
|
2011-06-22 00:59:34 +08:00
|
|
|
|
|
|
|
/* setup generic device info */
|
|
|
|
dev->dev.of_node = of_node_get(node);
|
2014-11-04 18:26:26 +08:00
|
|
|
dev->dev.parent = parent ? : &platform_bus;
|
2011-06-22 00:59:34 +08:00
|
|
|
dev->dev.platform_data = platform_data;
|
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|
|
if (bus_id)
|
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|
|
dev_set_name(&dev->dev, "%s", bus_id);
|
|
|
|
else
|
|
|
|
of_device_make_bus_id(&dev->dev);
|
2014-09-17 19:56:07 +08:00
|
|
|
of_dma_configure(&dev->dev);
|
2011-06-22 00:59:34 +08:00
|
|
|
|
|
|
|
/* Allow the HW Peripheral ID to be overridden */
|
|
|
|
prop = of_get_property(node, "arm,primecell-periphid", NULL);
|
|
|
|
if (prop)
|
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|
|
dev->periphid = of_read_ulong(prop, 1);
|
|
|
|
|
|
|
|
/* Decode the IRQs and address ranges */
|
|
|
|
for (i = 0; i < AMBA_NR_IRQS; i++)
|
|
|
|
dev->irq[i] = irq_of_parse_and_map(node, i);
|
|
|
|
|
|
|
|
ret = of_address_to_resource(node, 0, &dev->res);
|
2013-08-30 19:17:29 +08:00
|
|
|
if (ret) {
|
|
|
|
pr_err("%s(): of_address_to_resource() failed (%d) for %s\n",
|
|
|
|
__func__, ret, node->full_name);
|
2011-06-22 00:59:34 +08:00
|
|
|
goto err_free;
|
2013-08-30 19:17:29 +08:00
|
|
|
}
|
2011-06-22 00:59:34 +08:00
|
|
|
|
2011-12-18 19:45:17 +08:00
|
|
|
ret = amba_device_add(dev, &iomem_resource);
|
2013-08-30 19:17:29 +08:00
|
|
|
if (ret) {
|
|
|
|
pr_err("%s(): amba_device_add() failed (%d) for %s\n",
|
|
|
|
__func__, ret, node->full_name);
|
2011-06-22 00:59:34 +08:00
|
|
|
goto err_free;
|
2013-08-30 19:17:29 +08:00
|
|
|
}
|
2011-06-22 00:59:34 +08:00
|
|
|
|
|
|
|
return dev;
|
|
|
|
|
|
|
|
err_free:
|
2011-12-18 19:45:17 +08:00
|
|
|
amba_device_put(dev);
|
2014-05-15 23:55:24 +08:00
|
|
|
err_clear_flag:
|
|
|
|
of_node_clear_flag(node, OF_POPULATED);
|
2011-06-22 00:59:34 +08:00
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
#else /* CONFIG_ARM_AMBA */
|
|
|
|
static struct amba_device *of_amba_device_create(struct device_node *node,
|
|
|
|
const char *bus_id,
|
|
|
|
void *platform_data,
|
|
|
|
struct device *parent)
|
|
|
|
{
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_ARM_AMBA */
|
|
|
|
|
2011-06-22 00:59:35 +08:00
|
|
|
/**
|
|
|
|
* of_devname_lookup() - Given a device node, lookup the preferred Linux name
|
|
|
|
*/
|
|
|
|
static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup,
|
|
|
|
struct device_node *np)
|
|
|
|
{
|
|
|
|
struct resource res;
|
2011-11-03 13:07:29 +08:00
|
|
|
|
|
|
|
if (!lookup)
|
|
|
|
return NULL;
|
|
|
|
|
2011-12-13 00:26:00 +08:00
|
|
|
for(; lookup->compatible != NULL; lookup++) {
|
2011-11-03 13:07:29 +08:00
|
|
|
if (!of_device_is_compatible(np, lookup->compatible))
|
|
|
|
continue;
|
2012-07-05 22:15:36 +08:00
|
|
|
if (!of_address_to_resource(np, 0, &res))
|
|
|
|
if (res.start != lookup->phys_addr)
|
|
|
|
continue;
|
2011-11-03 13:07:29 +08:00
|
|
|
pr_debug("%s: devname=%s\n", np->full_name, lookup->name);
|
|
|
|
return lookup;
|
2011-06-22 00:59:35 +08:00
|
|
|
}
|
2011-11-03 13:07:29 +08:00
|
|
|
|
2011-06-22 00:59:35 +08:00
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
2010-06-08 21:48:13 +08:00
|
|
|
/**
|
2011-03-19 00:21:28 +08:00
|
|
|
* of_platform_bus_create() - Create a device for a node and its children.
|
2010-06-08 21:48:13 +08:00
|
|
|
* @bus: device node of the bus to instantiate
|
2011-03-19 00:21:29 +08:00
|
|
|
* @matches: match table for bus nodes
|
2011-11-03 13:07:29 +08:00
|
|
|
* @lookup: auxdata table for matching id and platform_data with device nodes
|
2011-03-19 00:21:28 +08:00
|
|
|
* @parent: parent for new device, or NULL for top level.
|
2011-11-03 13:07:29 +08:00
|
|
|
* @strict: require compatible property
|
2011-03-19 00:21:28 +08:00
|
|
|
*
|
|
|
|
* Creates a platform_device for the provided device_node, and optionally
|
|
|
|
* recursively create devices for all the child nodes.
|
2010-06-08 21:48:13 +08:00
|
|
|
*/
|
2011-03-19 00:21:28 +08:00
|
|
|
static int of_platform_bus_create(struct device_node *bus,
|
2010-06-08 21:48:13 +08:00
|
|
|
const struct of_device_id *matches,
|
2011-06-22 00:59:35 +08:00
|
|
|
const struct of_dev_auxdata *lookup,
|
2011-06-22 00:59:34 +08:00
|
|
|
struct device *parent, bool strict)
|
2010-06-08 21:48:13 +08:00
|
|
|
{
|
2011-06-22 00:59:35 +08:00
|
|
|
const struct of_dev_auxdata *auxdata;
|
2010-06-08 21:48:13 +08:00
|
|
|
struct device_node *child;
|
2010-07-23 03:59:23 +08:00
|
|
|
struct platform_device *dev;
|
2011-06-22 00:59:35 +08:00
|
|
|
const char *bus_id = NULL;
|
|
|
|
void *platform_data = NULL;
|
2010-06-08 21:48:13 +08:00
|
|
|
int rc = 0;
|
|
|
|
|
2011-06-22 00:59:34 +08:00
|
|
|
/* Make sure it has a compatible property */
|
|
|
|
if (strict && (!of_get_property(bus, "compatible", NULL))) {
|
|
|
|
pr_debug("%s() - skipping %s, no compatible prop\n",
|
|
|
|
__func__, bus->full_name);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-06-22 00:59:35 +08:00
|
|
|
auxdata = of_dev_lookup(lookup, bus);
|
|
|
|
if (auxdata) {
|
|
|
|
bus_id = auxdata->name;
|
|
|
|
platform_data = auxdata->platform_data;
|
|
|
|
}
|
|
|
|
|
2011-06-22 00:59:34 +08:00
|
|
|
if (of_device_is_compatible(bus, "arm,primecell")) {
|
2013-08-30 19:17:29 +08:00
|
|
|
/*
|
|
|
|
* Don't return an error here to keep compatibility with older
|
|
|
|
* device tree files.
|
|
|
|
*/
|
2011-06-22 00:59:35 +08:00
|
|
|
of_amba_device_create(bus, bus_id, platform_data, parent);
|
2011-06-22 00:59:34 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-06-22 00:59:35 +08:00
|
|
|
dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent);
|
2011-03-19 00:21:28 +08:00
|
|
|
if (!dev || !of_match_node(matches, bus))
|
|
|
|
return 0;
|
|
|
|
|
2010-06-08 21:48:13 +08:00
|
|
|
for_each_child_of_node(bus, child) {
|
|
|
|
pr_debug(" create child: %s\n", child->full_name);
|
2011-06-22 00:59:35 +08:00
|
|
|
rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict);
|
2010-06-08 21:48:13 +08:00
|
|
|
if (rc) {
|
|
|
|
of_node_put(child);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
2014-06-24 23:13:47 +08:00
|
|
|
of_node_set_flag(bus, OF_POPULATED_BUS);
|
2010-06-08 21:48:13 +08:00
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2011-03-19 00:21:28 +08:00
|
|
|
* of_platform_bus_probe() - Probe the device-tree for platform buses
|
2010-06-08 21:48:13 +08:00
|
|
|
* @root: parent of the first level to probe or NULL for the root of the tree
|
2011-03-19 00:21:29 +08:00
|
|
|
* @matches: match table for bus nodes
|
2010-06-08 21:48:13 +08:00
|
|
|
* @parent: parent to hook devices from, NULL for toplevel
|
|
|
|
*
|
|
|
|
* Note that children of the provided root are not instantiated as devices
|
|
|
|
* unless the specified root itself matches the bus list and is not NULL.
|
|
|
|
*/
|
|
|
|
int of_platform_bus_probe(struct device_node *root,
|
|
|
|
const struct of_device_id *matches,
|
|
|
|
struct device *parent)
|
|
|
|
{
|
|
|
|
struct device_node *child;
|
|
|
|
int rc = 0;
|
|
|
|
|
2011-03-19 00:21:29 +08:00
|
|
|
root = root ? of_node_get(root) : of_find_node_by_path("/");
|
|
|
|
if (!root)
|
2010-06-08 21:48:25 +08:00
|
|
|
return -EINVAL;
|
2010-06-08 21:48:13 +08:00
|
|
|
|
|
|
|
pr_debug("of_platform_bus_probe()\n");
|
|
|
|
pr_debug(" starting at: %s\n", root->full_name);
|
|
|
|
|
2011-03-19 00:21:29 +08:00
|
|
|
/* Do a self check of bus type, if there's a match, create children */
|
2010-06-08 21:48:13 +08:00
|
|
|
if (of_match_node(matches, root)) {
|
2011-06-22 00:59:35 +08:00
|
|
|
rc = of_platform_bus_create(root, matches, NULL, parent, false);
|
2011-03-19 00:21:28 +08:00
|
|
|
} else for_each_child_of_node(root, child) {
|
2010-06-08 21:48:13 +08:00
|
|
|
if (!of_match_node(matches, child))
|
|
|
|
continue;
|
2011-06-22 00:59:35 +08:00
|
|
|
rc = of_platform_bus_create(child, matches, NULL, parent, false);
|
2011-03-19 00:21:28 +08:00
|
|
|
if (rc)
|
2010-06-08 21:48:13 +08:00
|
|
|
break;
|
|
|
|
}
|
2011-03-19 00:21:28 +08:00
|
|
|
|
2010-06-08 21:48:13 +08:00
|
|
|
of_node_put(root);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(of_platform_bus_probe);
|
2011-06-22 00:59:34 +08:00
|
|
|
|
|
|
|
/**
|
|
|
|
* of_platform_populate() - Populate platform_devices from device tree data
|
|
|
|
* @root: parent of the first level to probe or NULL for the root of the tree
|
|
|
|
* @matches: match table, NULL to use the default
|
2012-11-24 00:25:08 +08:00
|
|
|
* @lookup: auxdata table for matching id and platform_data with device nodes
|
2011-06-22 00:59:34 +08:00
|
|
|
* @parent: parent to hook devices from, NULL for toplevel
|
|
|
|
*
|
|
|
|
* Similar to of_platform_bus_probe(), this function walks the device tree
|
|
|
|
* and creates devices from nodes. It differs in that it follows the modern
|
|
|
|
* convention of requiring all device nodes to have a 'compatible' property,
|
|
|
|
* and it is suitable for creating devices which are children of the root
|
|
|
|
* node (of_platform_bus_probe will only create children of the root which
|
|
|
|
* are selected by the @matches argument).
|
|
|
|
*
|
|
|
|
* New board support should be using this function instead of
|
|
|
|
* of_platform_bus_probe().
|
|
|
|
*
|
|
|
|
* Returns 0 on success, < 0 on failure.
|
|
|
|
*/
|
|
|
|
int of_platform_populate(struct device_node *root,
|
|
|
|
const struct of_device_id *matches,
|
2011-06-22 00:59:35 +08:00
|
|
|
const struct of_dev_auxdata *lookup,
|
2011-06-22 00:59:34 +08:00
|
|
|
struct device *parent)
|
|
|
|
{
|
|
|
|
struct device_node *child;
|
|
|
|
int rc = 0;
|
|
|
|
|
|
|
|
root = root ? of_node_get(root) : of_find_node_by_path("/");
|
|
|
|
if (!root)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
for_each_child_of_node(root, child) {
|
2011-06-22 00:59:35 +08:00
|
|
|
rc = of_platform_bus_create(child, matches, lookup, parent, true);
|
2011-06-22 00:59:34 +08:00
|
|
|
if (rc)
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
of_node_put(root);
|
|
|
|
return rc;
|
|
|
|
}
|
2012-06-08 07:57:36 +08:00
|
|
|
EXPORT_SYMBOL_GPL(of_platform_populate);
|
2014-05-15 23:55:24 +08:00
|
|
|
|
|
|
|
static int of_platform_device_destroy(struct device *dev, void *data)
|
|
|
|
{
|
|
|
|
/* Do not touch devices not populated from the device tree */
|
2014-06-24 23:13:47 +08:00
|
|
|
if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED))
|
2014-05-15 23:55:24 +08:00
|
|
|
return 0;
|
|
|
|
|
2014-06-24 23:13:47 +08:00
|
|
|
/* Recurse for any nodes that were treated as busses */
|
|
|
|
if (of_node_check_flag(dev->of_node, OF_POPULATED_BUS))
|
|
|
|
device_for_each_child(dev, NULL, of_platform_device_destroy);
|
2014-05-15 23:55:24 +08:00
|
|
|
|
|
|
|
if (dev->bus == &platform_bus_type)
|
|
|
|
platform_device_unregister(to_platform_device(dev));
|
|
|
|
#ifdef CONFIG_ARM_AMBA
|
|
|
|
else if (dev->bus == &amba_bustype)
|
|
|
|
amba_device_unregister(to_amba_device(dev));
|
|
|
|
#endif
|
|
|
|
|
|
|
|
of_node_clear_flag(dev->of_node, OF_POPULATED);
|
2014-06-24 23:13:47 +08:00
|
|
|
of_node_clear_flag(dev->of_node, OF_POPULATED_BUS);
|
2014-05-15 23:55:24 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* of_platform_depopulate() - Remove devices populated from device tree
|
2014-06-24 23:13:47 +08:00
|
|
|
* @parent: device which children will be removed
|
2014-05-15 23:55:24 +08:00
|
|
|
*
|
|
|
|
* Complementary to of_platform_populate(), this function removes children
|
|
|
|
* of the given device (and, recurrently, their children) that have been
|
|
|
|
* created from their respective device tree nodes (and only those,
|
|
|
|
* leaving others - eg. manually created - unharmed).
|
|
|
|
*
|
|
|
|
* Returns 0 when all children devices have been removed or
|
|
|
|
* -EBUSY when some children remained.
|
|
|
|
*/
|
2014-06-24 23:13:47 +08:00
|
|
|
void of_platform_depopulate(struct device *parent)
|
2014-05-15 23:55:24 +08:00
|
|
|
{
|
2014-06-24 23:13:47 +08:00
|
|
|
device_for_each_child(parent, NULL, of_platform_device_destroy);
|
2014-05-15 23:55:24 +08:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(of_platform_depopulate);
|
|
|
|
|
2012-02-25 05:58:34 +08:00
|
|
|
#endif /* CONFIG_OF_ADDRESS */
|