blob: 8d103e4968be4d9b36ca5e1740d8fcfb1c1d9a47 [file] [log] [blame]
Stephen Rothwell3f23de12007-05-03 02:38:57 +10001/*
2 * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
3 * <benh@kernel.crashing.org>
4 * and Arnd Bergmann, IBM Corp.
5 * Merged from powerpc/kernel/of_platform.c and
6 * sparc{,64}/kernel/of_device.c by Stephen Rothwell
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 *
13 */
14#include <linux/errno.h>
Stephen Rothwell5c457082007-10-17 21:17:42 -070015#include <linux/module.h>
Grant Likely5de15402011-06-21 10:59:34 -060016#include <linux/amba/bus.h>
Stephen Rothwell3f23de12007-05-03 02:38:57 +100017#include <linux/device.h>
Grant Likely5fd200f2010-06-08 07:48:13 -060018#include <linux/dma-mapping.h>
Grant Likely50ef5282010-06-08 07:48:20 -060019#include <linux/slab.h>
Grant Likely9e3288d2010-06-08 07:48:26 -060020#include <linux/of_address.h>
Stephen Rothwell3f23de12007-05-03 02:38:57 +100021#include <linux/of_device.h>
Grant Likely9e3288d2010-06-08 07:48:26 -060022#include <linux/of_irq.h>
Stephen Rothwell3f23de12007-05-03 02:38:57 +100023#include <linux/of_platform.h>
Grant Likelyeca39302010-06-08 07:48:21 -060024#include <linux/platform_device.h>
25
Grant Likelycbb49c22011-06-21 10:59:34 -060026const struct of_device_id of_default_bus_match_table[] = {
27 { .compatible = "simple-bus", },
Linus Walleij22869a92015-03-03 09:52:20 +010028 { .compatible = "simple-mfd", },
Grant Likelycbb49c22011-06-21 10:59:34 -060029#ifdef CONFIG_ARM_AMBA
30 { .compatible = "arm,amba-bus", },
31#endif /* CONFIG_ARM_AMBA */
32 {} /* Empty terminated list */
33};
Masahiro Yamadab80443c2016-01-05 11:17:53 +090034EXPORT_SYMBOL(of_default_bus_match_table);
Grant Likelycbb49c22011-06-21 10:59:34 -060035
Jonas Bonnc6085582010-07-23 19:19:35 +020036static int of_dev_node_match(struct device *dev, void *data)
37{
38 return dev->of_node == data;
39}
40
41/**
42 * of_find_device_by_node - Find the platform_device associated with a node
43 * @np: Pointer to device tree node
44 *
45 * Returns platform_device pointer, or NULL if not found
46 */
47struct platform_device *of_find_device_by_node(struct device_node *np)
48{
49 struct device *dev;
50
51 dev = bus_find_device(&platform_bus_type, NULL, np, of_dev_node_match);
52 return dev ? to_platform_device(dev) : NULL;
53}
54EXPORT_SYMBOL(of_find_device_by_node);
55
Grant Likely964dba22012-02-24 14:58:34 -070056#ifdef CONFIG_OF_ADDRESS
Grant Likely5fd200f2010-06-08 07:48:13 -060057/*
58 * The following routines scan a subtree and registers a device for
59 * each applicable node.
60 *
61 * Note: sparc doesn't use these routines because it has a different
62 * mechanism for creating devices from device tree nodes.
63 */
64
65/**
Grant Likely94c09312010-06-08 07:48:14 -060066 * of_device_make_bus_id - Use the device node data to assign a unique name
67 * @dev: pointer to device structure that is linked to a device tree node
68 *
Grant Likely07e461c2014-05-21 15:40:31 +090069 * This routine will first try using the translated bus address to
70 * derive a unique name. If it cannot, then it will prepend names from
71 * parent nodes until a unique name can be derived.
Grant Likely94c09312010-06-08 07:48:14 -060072 */
Grant Likelyc6601222010-07-23 15:04:01 -060073void of_device_make_bus_id(struct device *dev)
Grant Likely94c09312010-06-08 07:48:14 -060074{
Grant Likely94c09312010-06-08 07:48:14 -060075 struct device_node *node = dev->of_node;
Kim Phillips24fb5302012-10-08 19:42:11 -050076 const __be32 *reg;
Grant Likely94c09312010-06-08 07:48:14 -060077 u64 addr;
Grant Likely94c09312010-06-08 07:48:14 -060078
Grant Likely07e461c2014-05-21 15:40:31 +090079 /* Construct the name, using parent nodes if necessary to ensure uniqueness */
80 while (node->parent) {
81 /*
82 * If the address can be translated, then that is as much
83 * uniqueness as we need. Make it the first component and return
84 */
85 reg = of_get_property(node, "reg", NULL);
86 if (reg && (addr = of_translate_address(node, reg)) != OF_BAD_ADDR) {
87 dev_set_name(dev, dev_name(dev) ? "%llx.%s:%s" : "%llx.%s",
88 (unsigned long long)addr, node->name,
89 dev_name(dev));
Grant Likely94c09312010-06-08 07:48:14 -060090 return;
91 }
Grant Likely94c09312010-06-08 07:48:14 -060092
Grant Likely07e461c2014-05-21 15:40:31 +090093 /* format arguments only used if dev_name() resolves to NULL */
94 dev_set_name(dev, dev_name(dev) ? "%s:%s" : "%s",
95 strrchr(node->full_name, '/') + 1, dev_name(dev));
96 node = node->parent;
Grant Likely94c09312010-06-08 07:48:14 -060097 }
Grant Likely94c09312010-06-08 07:48:14 -060098}
99
100/**
101 * of_device_alloc - Allocate and initialize an of_device
102 * @np: device node to assign to device
103 * @bus_id: Name to assign to the device. May be null to use default name.
104 * @parent: Parent device.
105 */
Grant Likely94a0cb12010-07-22 13:59:23 -0600106struct platform_device *of_device_alloc(struct device_node *np,
Grant Likely94c09312010-06-08 07:48:14 -0600107 const char *bus_id,
108 struct device *parent)
109{
Grant Likely94a0cb12010-07-22 13:59:23 -0600110 struct platform_device *dev;
Andres Salomon52f65372010-10-10 21:35:05 -0600111 int rc, i, num_reg = 0, num_irq;
Grant Likelyac80a512010-06-08 07:48:15 -0600112 struct resource *res, temp_res;
Grant Likely94c09312010-06-08 07:48:14 -0600113
Grant Likely7096d042010-10-20 11:45:13 -0600114 dev = platform_device_alloc("", -1);
115 if (!dev)
116 return NULL;
117
118 /* count the io and irq resources */
Rob Herringd9c68662014-05-07 15:23:56 -0500119 while (of_address_to_resource(np, num_reg, &temp_res) == 0)
120 num_reg++;
Andres Salomon52f65372010-10-10 21:35:05 -0600121 num_irq = of_irq_count(np);
Grant Likelyac80a512010-06-08 07:48:15 -0600122
Grant Likelyac80a512010-06-08 07:48:15 -0600123 /* Populate the resource table */
124 if (num_irq || num_reg) {
Grant Likely7096d042010-10-20 11:45:13 -0600125 res = kzalloc(sizeof(*res) * (num_irq + num_reg), GFP_KERNEL);
126 if (!res) {
127 platform_device_put(dev);
128 return NULL;
129 }
130
Grant Likelyac80a512010-06-08 07:48:15 -0600131 dev->num_resources = num_reg + num_irq;
132 dev->resource = res;
133 for (i = 0; i < num_reg; i++, res++) {
134 rc = of_address_to_resource(np, i, res);
135 WARN_ON(rc);
136 }
Rob Herring9ec36ca2014-04-23 17:57:41 -0500137 if (of_irq_to_resource_table(np, res, num_irq) != num_irq)
138 pr_debug("not all legacy IRQ resources mapped for %s\n",
139 np->name);
Grant Likelyac80a512010-06-08 07:48:15 -0600140 }
Grant Likely94c09312010-06-08 07:48:14 -0600141
142 dev->dev.of_node = of_node_get(np);
Grant Likely43c07672014-11-04 10:26:26 +0000143 dev->dev.parent = parent ? : &platform_bus;
Grant Likely94c09312010-06-08 07:48:14 -0600144
145 if (bus_id)
146 dev_set_name(&dev->dev, "%s", bus_id);
147 else
148 of_device_make_bus_id(&dev->dev);
149
150 return dev;
151}
152EXPORT_SYMBOL(of_device_alloc);
153
Will Deacon97890ba2014-08-27 16:24:20 +0100154static void of_dma_deconfigure(struct device *dev)
155{
156 arch_teardown_dma_ops(dev);
Santosh Shilimkar591c1ee2014-04-24 11:30:04 -0400157}
158
159/**
Grant Likely15c35972011-06-21 10:59:35 -0600160 * of_platform_device_create_pdata - Alloc, initialize and register an of_device
Grant Likely5fd200f2010-06-08 07:48:13 -0600161 * @np: pointer to node to create device for
162 * @bus_id: name to assign device
Grant Likely15c35972011-06-21 10:59:35 -0600163 * @platform_data: pointer to populate platform_data pointer with
Grant Likely5fd200f2010-06-08 07:48:13 -0600164 * @parent: Linux device model parent device.
Grant Likelycd1e6502011-01-03 15:51:11 -0700165 *
166 * Returns pointer to created platform device, or NULL if a device was not
167 * registered. Unavailable devices will not get registered.
Grant Likely5fd200f2010-06-08 07:48:13 -0600168 */
Mark Brown245d9642013-07-01 20:26:52 +0100169static struct platform_device *of_platform_device_create_pdata(
Grant Likely15c35972011-06-21 10:59:35 -0600170 struct device_node *np,
171 const char *bus_id,
172 void *platform_data,
173 struct device *parent)
Grant Likely5fd200f2010-06-08 07:48:13 -0600174{
Grant Likely94a0cb12010-07-22 13:59:23 -0600175 struct platform_device *dev;
Grant Likely5fd200f2010-06-08 07:48:13 -0600176
Pawel Mollc6e126d2014-05-15 16:55:24 +0100177 if (!of_device_is_available(np) ||
178 of_node_test_and_set_flag(np, OF_POPULATED))
Grant Likelycd1e6502011-01-03 15:51:11 -0700179 return NULL;
180
Grant Likely5fd200f2010-06-08 07:48:13 -0600181 dev = of_device_alloc(np, bus_id, parent);
182 if (!dev)
Pawel Mollc6e126d2014-05-15 16:55:24 +0100183 goto err_clear_flag;
Grant Likely5fd200f2010-06-08 07:48:13 -0600184
Grant Likelyeca39302010-06-08 07:48:21 -0600185 dev->dev.bus = &platform_bus_type;
Grant Likely15c35972011-06-21 10:59:35 -0600186 dev->dev.platform_data = platform_data;
Murali Karicheri1f5c69a2015-03-03 12:52:09 -0500187 of_dma_configure(&dev->dev, dev->dev.of_node);
Marc Zyngierc706c232015-07-28 14:46:15 +0100188 of_msi_configure(&dev->dev, dev->dev.of_node);
Grant Likely5fd200f2010-06-08 07:48:13 -0600189
Grant Likely7096d042010-10-20 11:45:13 -0600190 if (of_device_add(dev) != 0) {
Will Deacon97890ba2014-08-27 16:24:20 +0100191 of_dma_deconfigure(&dev->dev);
Grant Likely7096d042010-10-20 11:45:13 -0600192 platform_device_put(dev);
Pawel Mollc6e126d2014-05-15 16:55:24 +0100193 goto err_clear_flag;
Grant Likely5fd200f2010-06-08 07:48:13 -0600194 }
195
196 return dev;
Pawel Mollc6e126d2014-05-15 16:55:24 +0100197
198err_clear_flag:
199 of_node_clear_flag(np, OF_POPULATED);
200 return NULL;
Grant Likely5fd200f2010-06-08 07:48:13 -0600201}
Grant Likely15c35972011-06-21 10:59:35 -0600202
203/**
204 * of_platform_device_create - Alloc, initialize and register an of_device
205 * @np: pointer to node to create device for
206 * @bus_id: name to assign device
207 * @parent: Linux device model parent device.
208 *
209 * Returns pointer to created platform device, or NULL if a device was not
210 * registered. Unavailable devices will not get registered.
211 */
212struct platform_device *of_platform_device_create(struct device_node *np,
213 const char *bus_id,
214 struct device *parent)
215{
216 return of_platform_device_create_pdata(np, bus_id, NULL, parent);
217}
Grant Likely5fd200f2010-06-08 07:48:13 -0600218EXPORT_SYMBOL(of_platform_device_create);
219
Grant Likely5de15402011-06-21 10:59:34 -0600220#ifdef CONFIG_ARM_AMBA
221static struct amba_device *of_amba_device_create(struct device_node *node,
222 const char *bus_id,
223 void *platform_data,
224 struct device *parent)
225{
226 struct amba_device *dev;
227 const void *prop;
228 int i, ret;
229
230 pr_debug("Creating amba device %s\n", node->full_name);
231
Pawel Mollc6e126d2014-05-15 16:55:24 +0100232 if (!of_device_is_available(node) ||
233 of_node_test_and_set_flag(node, OF_POPULATED))
Grant Likely5de15402011-06-21 10:59:34 -0600234 return NULL;
235
Russell Kingc0f72f82011-12-18 11:45:17 +0000236 dev = amba_device_alloc(NULL, 0, 0);
Bartlomiej Zolnierkiewicz2bc552d2013-08-30 13:17:29 +0200237 if (!dev) {
238 pr_err("%s(): amba_device_alloc() failed for %s\n",
239 __func__, node->full_name);
Pawel Mollc6e126d2014-05-15 16:55:24 +0100240 goto err_clear_flag;
Bartlomiej Zolnierkiewicz2bc552d2013-08-30 13:17:29 +0200241 }
Grant Likely5de15402011-06-21 10:59:34 -0600242
243 /* setup generic device info */
Grant Likely5de15402011-06-21 10:59:34 -0600244 dev->dev.of_node = of_node_get(node);
Grant Likely43c07672014-11-04 10:26:26 +0000245 dev->dev.parent = parent ? : &platform_bus;
Grant Likely5de15402011-06-21 10:59:34 -0600246 dev->dev.platform_data = platform_data;
247 if (bus_id)
248 dev_set_name(&dev->dev, "%s", bus_id);
249 else
250 of_device_make_bus_id(&dev->dev);
Murali Karicheri1f5c69a2015-03-03 12:52:09 -0500251 of_dma_configure(&dev->dev, dev->dev.of_node);
Grant Likely5de15402011-06-21 10:59:34 -0600252
Grant Likely5de15402011-06-21 10:59:34 -0600253 /* Allow the HW Peripheral ID to be overridden */
254 prop = of_get_property(node, "arm,primecell-periphid", NULL);
255 if (prop)
256 dev->periphid = of_read_ulong(prop, 1);
257
258 /* Decode the IRQs and address ranges */
259 for (i = 0; i < AMBA_NR_IRQS; i++)
260 dev->irq[i] = irq_of_parse_and_map(node, i);
261
262 ret = of_address_to_resource(node, 0, &dev->res);
Bartlomiej Zolnierkiewicz2bc552d2013-08-30 13:17:29 +0200263 if (ret) {
264 pr_err("%s(): of_address_to_resource() failed (%d) for %s\n",
265 __func__, ret, node->full_name);
Grant Likely5de15402011-06-21 10:59:34 -0600266 goto err_free;
Bartlomiej Zolnierkiewicz2bc552d2013-08-30 13:17:29 +0200267 }
Grant Likely5de15402011-06-21 10:59:34 -0600268
Russell Kingc0f72f82011-12-18 11:45:17 +0000269 ret = amba_device_add(dev, &iomem_resource);
Bartlomiej Zolnierkiewicz2bc552d2013-08-30 13:17:29 +0200270 if (ret) {
271 pr_err("%s(): amba_device_add() failed (%d) for %s\n",
272 __func__, ret, node->full_name);
Grant Likely5de15402011-06-21 10:59:34 -0600273 goto err_free;
Bartlomiej Zolnierkiewicz2bc552d2013-08-30 13:17:29 +0200274 }
Grant Likely5de15402011-06-21 10:59:34 -0600275
276 return dev;
277
278err_free:
Russell Kingc0f72f82011-12-18 11:45:17 +0000279 amba_device_put(dev);
Pawel Mollc6e126d2014-05-15 16:55:24 +0100280err_clear_flag:
281 of_node_clear_flag(node, OF_POPULATED);
Grant Likely5de15402011-06-21 10:59:34 -0600282 return NULL;
283}
284#else /* CONFIG_ARM_AMBA */
285static struct amba_device *of_amba_device_create(struct device_node *node,
286 const char *bus_id,
287 void *platform_data,
288 struct device *parent)
289{
290 return NULL;
291}
292#endif /* CONFIG_ARM_AMBA */
293
Grant Likely5fd200f2010-06-08 07:48:13 -0600294/**
Grant Likely15c35972011-06-21 10:59:35 -0600295 * of_devname_lookup() - Given a device node, lookup the preferred Linux name
296 */
297static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup,
298 struct device_node *np)
299{
300 struct resource res;
Olof Johansson303f59d2011-11-02 22:07:29 -0700301
302 if (!lookup)
303 return NULL;
304
Grant Likelyf88e1ae2011-12-12 09:26:00 -0700305 for(; lookup->compatible != NULL; lookup++) {
Olof Johansson303f59d2011-11-02 22:07:29 -0700306 if (!of_device_is_compatible(np, lookup->compatible))
307 continue;
Lee Jones84774e62012-07-05 15:15:36 +0100308 if (!of_address_to_resource(np, 0, &res))
309 if (res.start != lookup->phys_addr)
310 continue;
Olof Johansson303f59d2011-11-02 22:07:29 -0700311 pr_debug("%s: devname=%s\n", np->full_name, lookup->name);
312 return lookup;
Grant Likely15c35972011-06-21 10:59:35 -0600313 }
Olof Johansson303f59d2011-11-02 22:07:29 -0700314
Grant Likely15c35972011-06-21 10:59:35 -0600315 return NULL;
316}
317
318/**
Grant Likely38e9e212011-03-18 10:21:28 -0600319 * of_platform_bus_create() - Create a device for a node and its children.
Grant Likely5fd200f2010-06-08 07:48:13 -0600320 * @bus: device node of the bus to instantiate
Grant Likely1eed4c02011-03-18 10:21:29 -0600321 * @matches: match table for bus nodes
Olof Johansson303f59d2011-11-02 22:07:29 -0700322 * @lookup: auxdata table for matching id and platform_data with device nodes
Grant Likely38e9e212011-03-18 10:21:28 -0600323 * @parent: parent for new device, or NULL for top level.
Olof Johansson303f59d2011-11-02 22:07:29 -0700324 * @strict: require compatible property
Grant Likely38e9e212011-03-18 10:21:28 -0600325 *
326 * Creates a platform_device for the provided device_node, and optionally
327 * recursively create devices for all the child nodes.
Grant Likely5fd200f2010-06-08 07:48:13 -0600328 */
Grant Likely38e9e212011-03-18 10:21:28 -0600329static int of_platform_bus_create(struct device_node *bus,
Grant Likely5fd200f2010-06-08 07:48:13 -0600330 const struct of_device_id *matches,
Grant Likely15c35972011-06-21 10:59:35 -0600331 const struct of_dev_auxdata *lookup,
Grant Likely29d4f8a2011-06-21 10:59:34 -0600332 struct device *parent, bool strict)
Grant Likely5fd200f2010-06-08 07:48:13 -0600333{
Grant Likely15c35972011-06-21 10:59:35 -0600334 const struct of_dev_auxdata *auxdata;
Grant Likely5fd200f2010-06-08 07:48:13 -0600335 struct device_node *child;
Grant Likely94a0cb12010-07-22 13:59:23 -0600336 struct platform_device *dev;
Grant Likely15c35972011-06-21 10:59:35 -0600337 const char *bus_id = NULL;
338 void *platform_data = NULL;
Grant Likely5fd200f2010-06-08 07:48:13 -0600339 int rc = 0;
340
Grant Likely29d4f8a2011-06-21 10:59:34 -0600341 /* Make sure it has a compatible property */
342 if (strict && (!of_get_property(bus, "compatible", NULL))) {
343 pr_debug("%s() - skipping %s, no compatible prop\n",
344 __func__, bus->full_name);
345 return 0;
346 }
347
Grant Likely15c35972011-06-21 10:59:35 -0600348 auxdata = of_dev_lookup(lookup, bus);
349 if (auxdata) {
350 bus_id = auxdata->name;
351 platform_data = auxdata->platform_data;
352 }
353
Grant Likely5de15402011-06-21 10:59:34 -0600354 if (of_device_is_compatible(bus, "arm,primecell")) {
Bartlomiej Zolnierkiewicz2bc552d2013-08-30 13:17:29 +0200355 /*
356 * Don't return an error here to keep compatibility with older
357 * device tree files.
358 */
Grant Likely15c35972011-06-21 10:59:35 -0600359 of_amba_device_create(bus, bus_id, platform_data, parent);
Grant Likely5de15402011-06-21 10:59:34 -0600360 return 0;
361 }
362
Grant Likely15c35972011-06-21 10:59:35 -0600363 dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent);
Grant Likely38e9e212011-03-18 10:21:28 -0600364 if (!dev || !of_match_node(matches, bus))
365 return 0;
366
Grant Likely5fd200f2010-06-08 07:48:13 -0600367 for_each_child_of_node(bus, child) {
368 pr_debug(" create child: %s\n", child->full_name);
Grant Likely15c35972011-06-21 10:59:35 -0600369 rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict);
Grant Likely5fd200f2010-06-08 07:48:13 -0600370 if (rc) {
371 of_node_put(child);
372 break;
373 }
374 }
Grant Likely75f353b2014-06-24 16:13:47 +0100375 of_node_set_flag(bus, OF_POPULATED_BUS);
Grant Likely5fd200f2010-06-08 07:48:13 -0600376 return rc;
377}
378
379/**
Grant Likely38e9e212011-03-18 10:21:28 -0600380 * of_platform_bus_probe() - Probe the device-tree for platform buses
Grant Likely5fd200f2010-06-08 07:48:13 -0600381 * @root: parent of the first level to probe or NULL for the root of the tree
Grant Likely1eed4c02011-03-18 10:21:29 -0600382 * @matches: match table for bus nodes
Grant Likely5fd200f2010-06-08 07:48:13 -0600383 * @parent: parent to hook devices from, NULL for toplevel
384 *
385 * Note that children of the provided root are not instantiated as devices
386 * unless the specified root itself matches the bus list and is not NULL.
387 */
388int of_platform_bus_probe(struct device_node *root,
389 const struct of_device_id *matches,
390 struct device *parent)
391{
392 struct device_node *child;
Grant Likely5fd200f2010-06-08 07:48:13 -0600393 int rc = 0;
394
Grant Likely1eed4c02011-03-18 10:21:29 -0600395 root = root ? of_node_get(root) : of_find_node_by_path("/");
396 if (!root)
Grant Likely60d59912010-06-08 07:48:25 -0600397 return -EINVAL;
Grant Likely5fd200f2010-06-08 07:48:13 -0600398
399 pr_debug("of_platform_bus_probe()\n");
400 pr_debug(" starting at: %s\n", root->full_name);
401
Grant Likely1eed4c02011-03-18 10:21:29 -0600402 /* Do a self check of bus type, if there's a match, create children */
Grant Likely5fd200f2010-06-08 07:48:13 -0600403 if (of_match_node(matches, root)) {
Grant Likely15c35972011-06-21 10:59:35 -0600404 rc = of_platform_bus_create(root, matches, NULL, parent, false);
Grant Likely38e9e212011-03-18 10:21:28 -0600405 } else for_each_child_of_node(root, child) {
Grant Likely5fd200f2010-06-08 07:48:13 -0600406 if (!of_match_node(matches, child))
407 continue;
Grant Likely15c35972011-06-21 10:59:35 -0600408 rc = of_platform_bus_create(child, matches, NULL, parent, false);
Julia Lawall7fad948a2015-10-22 11:02:49 +0200409 if (rc) {
410 of_node_put(child);
Grant Likely5fd200f2010-06-08 07:48:13 -0600411 break;
Julia Lawall7fad948a2015-10-22 11:02:49 +0200412 }
Grant Likely5fd200f2010-06-08 07:48:13 -0600413 }
Grant Likely38e9e212011-03-18 10:21:28 -0600414
Grant Likely5fd200f2010-06-08 07:48:13 -0600415 of_node_put(root);
416 return rc;
417}
418EXPORT_SYMBOL(of_platform_bus_probe);
Grant Likely29d4f8a2011-06-21 10:59:34 -0600419
420/**
421 * of_platform_populate() - Populate platform_devices from device tree data
422 * @root: parent of the first level to probe or NULL for the root of the tree
423 * @matches: match table, NULL to use the default
Javi Merino92039ed2012-11-23 16:25:08 +0000424 * @lookup: auxdata table for matching id and platform_data with device nodes
Grant Likely29d4f8a2011-06-21 10:59:34 -0600425 * @parent: parent to hook devices from, NULL for toplevel
426 *
427 * Similar to of_platform_bus_probe(), this function walks the device tree
428 * and creates devices from nodes. It differs in that it follows the modern
429 * convention of requiring all device nodes to have a 'compatible' property,
430 * and it is suitable for creating devices which are children of the root
431 * node (of_platform_bus_probe will only create children of the root which
432 * are selected by the @matches argument).
433 *
434 * New board support should be using this function instead of
435 * of_platform_bus_probe().
436 *
437 * Returns 0 on success, < 0 on failure.
438 */
439int of_platform_populate(struct device_node *root,
440 const struct of_device_id *matches,
Grant Likely15c35972011-06-21 10:59:35 -0600441 const struct of_dev_auxdata *lookup,
Grant Likely29d4f8a2011-06-21 10:59:34 -0600442 struct device *parent)
443{
444 struct device_node *child;
445 int rc = 0;
446
447 root = root ? of_node_get(root) : of_find_node_by_path("/");
448 if (!root)
449 return -EINVAL;
450
451 for_each_child_of_node(root, child) {
Grant Likely15c35972011-06-21 10:59:35 -0600452 rc = of_platform_bus_create(child, matches, lookup, parent, true);
Julia Lawall7fad948a2015-10-22 11:02:49 +0200453 if (rc) {
454 of_node_put(child);
Grant Likely29d4f8a2011-06-21 10:59:34 -0600455 break;
Julia Lawall7fad948a2015-10-22 11:02:49 +0200456 }
Grant Likely29d4f8a2011-06-21 10:59:34 -0600457 }
Grant Likely2d0747c2014-11-19 22:35:39 +0000458 of_node_set_flag(root, OF_POPULATED_BUS);
Grant Likely29d4f8a2011-06-21 10:59:34 -0600459
460 of_node_put(root);
461 return rc;
462}
Stephen Warrene001f1c2012-06-07 17:57:36 -0600463EXPORT_SYMBOL_GPL(of_platform_populate);
Pawel Mollc6e126d2014-05-15 16:55:24 +0100464
Hauke Mehrtens43443ad2015-08-02 19:44:43 +0200465int of_platform_default_populate(struct device_node *root,
466 const struct of_dev_auxdata *lookup,
467 struct device *parent)
468{
469 return of_platform_populate(root, of_default_bus_match_table, lookup,
470 parent);
471}
472EXPORT_SYMBOL_GPL(of_platform_default_populate);
473
Pawel Mollc6e126d2014-05-15 16:55:24 +0100474static int of_platform_device_destroy(struct device *dev, void *data)
475{
Pawel Mollc6e126d2014-05-15 16:55:24 +0100476 /* Do not touch devices not populated from the device tree */
Grant Likely75f353b2014-06-24 16:13:47 +0100477 if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED))
Pawel Mollc6e126d2014-05-15 16:55:24 +0100478 return 0;
Pawel Mollc6e126d2014-05-15 16:55:24 +0100479
Grant Likely75f353b2014-06-24 16:13:47 +0100480 /* Recurse for any nodes that were treated as busses */
481 if (of_node_check_flag(dev->of_node, OF_POPULATED_BUS))
482 device_for_each_child(dev, NULL, of_platform_device_destroy);
Pawel Mollc6e126d2014-05-15 16:55:24 +0100483
484 if (dev->bus == &platform_bus_type)
485 platform_device_unregister(to_platform_device(dev));
486#ifdef CONFIG_ARM_AMBA
487 else if (dev->bus == &amba_bustype)
488 amba_device_unregister(to_amba_device(dev));
489#endif
Pawel Mollc6e126d2014-05-15 16:55:24 +0100490
Will Deacon0495cb72015-01-16 17:04:56 +0000491 of_dma_deconfigure(dev);
Pawel Mollc6e126d2014-05-15 16:55:24 +0100492 of_node_clear_flag(dev->of_node, OF_POPULATED);
Grant Likely75f353b2014-06-24 16:13:47 +0100493 of_node_clear_flag(dev->of_node, OF_POPULATED_BUS);
Pawel Mollc6e126d2014-05-15 16:55:24 +0100494 return 0;
495}
496
497/**
498 * of_platform_depopulate() - Remove devices populated from device tree
Grant Likely75f353b2014-06-24 16:13:47 +0100499 * @parent: device which children will be removed
Pawel Mollc6e126d2014-05-15 16:55:24 +0100500 *
501 * Complementary to of_platform_populate(), this function removes children
502 * of the given device (and, recurrently, their children) that have been
503 * created from their respective device tree nodes (and only those,
504 * leaving others - eg. manually created - unharmed).
505 *
506 * Returns 0 when all children devices have been removed or
507 * -EBUSY when some children remained.
508 */
Grant Likely75f353b2014-06-24 16:13:47 +0100509void of_platform_depopulate(struct device *parent)
Pawel Mollc6e126d2014-05-15 16:55:24 +0100510{
Grant Likely2d0747c2014-11-19 22:35:39 +0000511 if (parent->of_node && of_node_check_flag(parent->of_node, OF_POPULATED_BUS)) {
512 device_for_each_child(parent, NULL, of_platform_device_destroy);
513 of_node_clear_flag(parent->of_node, OF_POPULATED_BUS);
514 }
Pawel Mollc6e126d2014-05-15 16:55:24 +0100515}
516EXPORT_SYMBOL_GPL(of_platform_depopulate);
517
Pantelis Antoniou801d7282014-10-28 22:36:01 +0200518#ifdef CONFIG_OF_DYNAMIC
519static int of_platform_notify(struct notifier_block *nb,
520 unsigned long action, void *arg)
521{
522 struct of_reconfig_data *rd = arg;
523 struct platform_device *pdev_parent, *pdev;
524 bool children_left;
525
526 switch (of_reconfig_get_state_change(action, rd)) {
527 case OF_RECONFIG_CHANGE_ADD:
528 /* verify that the parent is a bus */
529 if (!of_node_check_flag(rd->dn->parent, OF_POPULATED_BUS))
530 return NOTIFY_OK; /* not for us */
531
Pantelis Antoniou15204ab2014-12-16 19:45:26 +0200532 /* already populated? (driver using of_populate manually) */
533 if (of_node_check_flag(rd->dn, OF_POPULATED))
534 return NOTIFY_OK;
535
Pantelis Antoniou801d7282014-10-28 22:36:01 +0200536 /* pdev_parent may be NULL when no bus platform device */
537 pdev_parent = of_find_device_by_node(rd->dn->parent);
538 pdev = of_platform_device_create(rd->dn, NULL,
539 pdev_parent ? &pdev_parent->dev : NULL);
540 of_dev_put(pdev_parent);
541
542 if (pdev == NULL) {
543 pr_err("%s: failed to create for '%s'\n",
544 __func__, rd->dn->full_name);
545 /* of_platform_device_create tosses the error code */
546 return notifier_from_errno(-EINVAL);
547 }
548 break;
549
550 case OF_RECONFIG_CHANGE_REMOVE:
Pantelis Antoniou15204ab2014-12-16 19:45:26 +0200551
552 /* already depopulated? */
553 if (!of_node_check_flag(rd->dn, OF_POPULATED))
554 return NOTIFY_OK;
555
Pantelis Antoniou801d7282014-10-28 22:36:01 +0200556 /* find our device by node */
557 pdev = of_find_device_by_node(rd->dn);
558 if (pdev == NULL)
559 return NOTIFY_OK; /* no? not meant for us */
560
561 /* unregister takes one ref away */
562 of_platform_device_destroy(&pdev->dev, &children_left);
563
564 /* and put the reference of the find */
565 of_dev_put(pdev);
566 break;
567 }
568
569 return NOTIFY_OK;
570}
571
572static struct notifier_block platform_of_notifier = {
573 .notifier_call = of_platform_notify,
574};
575
576void of_platform_register_reconfig_notifier(void)
577{
578 WARN_ON(of_reconfig_notifier_register(&platform_of_notifier));
579}
580#endif /* CONFIG_OF_DYNAMIC */
581
Grant Likely964dba22012-02-24 14:58:34 -0700582#endif /* CONFIG_OF_ADDRESS */