blob: 8aa19769107437b8d3bfada2d4fbd35b4b4fc297 [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 */
Rob Herring606ad422016-06-15 08:32:18 -050014
15#define pr_fmt(fmt) "OF: " fmt
16
Stephen Rothwell3f23de12007-05-03 02:38:57 +100017#include <linux/errno.h>
Stephen Rothwell5c457082007-10-17 21:17:42 -070018#include <linux/module.h>
Grant Likely5de15402011-06-21 10:59:34 -060019#include <linux/amba/bus.h>
Stephen Rothwell3f23de12007-05-03 02:38:57 +100020#include <linux/device.h>
Grant Likely5fd200f2010-06-08 07:48:13 -060021#include <linux/dma-mapping.h>
Grant Likely50ef5282010-06-08 07:48:20 -060022#include <linux/slab.h>
Grant Likely9e3288d2010-06-08 07:48:26 -060023#include <linux/of_address.h>
Stephen Rothwell3f23de12007-05-03 02:38:57 +100024#include <linux/of_device.h>
Grant Likely9e3288d2010-06-08 07:48:26 -060025#include <linux/of_irq.h>
Stephen Rothwell3f23de12007-05-03 02:38:57 +100026#include <linux/of_platform.h>
Grant Likelyeca39302010-06-08 07:48:21 -060027#include <linux/platform_device.h>
28
Grant Likelycbb49c22011-06-21 10:59:34 -060029const struct of_device_id of_default_bus_match_table[] = {
30 { .compatible = "simple-bus", },
Linus Walleij22869a92015-03-03 09:52:20 +010031 { .compatible = "simple-mfd", },
Grant Likelycbb49c22011-06-21 10:59:34 -060032#ifdef CONFIG_ARM_AMBA
33 { .compatible = "arm,amba-bus", },
34#endif /* CONFIG_ARM_AMBA */
35 {} /* Empty terminated list */
36};
37
Jonas Bonnc6085582010-07-23 19:19:35 +020038static int of_dev_node_match(struct device *dev, void *data)
39{
40 return dev->of_node == data;
41}
42
43/**
44 * of_find_device_by_node - Find the platform_device associated with a node
45 * @np: Pointer to device tree node
46 *
47 * Returns platform_device pointer, or NULL if not found
48 */
49struct platform_device *of_find_device_by_node(struct device_node *np)
50{
51 struct device *dev;
52
53 dev = bus_find_device(&platform_bus_type, NULL, np, of_dev_node_match);
54 return dev ? to_platform_device(dev) : NULL;
55}
56EXPORT_SYMBOL(of_find_device_by_node);
57
Grant Likely964dba22012-02-24 14:58:34 -070058#ifdef CONFIG_OF_ADDRESS
Grant Likely5fd200f2010-06-08 07:48:13 -060059/*
60 * The following routines scan a subtree and registers a device for
61 * each applicable node.
62 *
63 * Note: sparc doesn't use these routines because it has a different
64 * mechanism for creating devices from device tree nodes.
65 */
66
67/**
Grant Likely94c09312010-06-08 07:48:14 -060068 * of_device_make_bus_id - Use the device node data to assign a unique name
69 * @dev: pointer to device structure that is linked to a device tree node
70 *
Grant Likely07e461c2014-05-21 15:40:31 +090071 * This routine will first try using the translated bus address to
72 * derive a unique name. If it cannot, then it will prepend names from
73 * parent nodes until a unique name can be derived.
Grant Likely94c09312010-06-08 07:48:14 -060074 */
Grant Likelyc6601222010-07-23 15:04:01 -060075void of_device_make_bus_id(struct device *dev)
Grant Likely94c09312010-06-08 07:48:14 -060076{
Grant Likely94c09312010-06-08 07:48:14 -060077 struct device_node *node = dev->of_node;
Kim Phillips24fb5302012-10-08 19:42:11 -050078 const __be32 *reg;
Grant Likely94c09312010-06-08 07:48:14 -060079 u64 addr;
Grant Likely94c09312010-06-08 07:48:14 -060080
Grant Likely07e461c2014-05-21 15:40:31 +090081 /* Construct the name, using parent nodes if necessary to ensure uniqueness */
82 while (node->parent) {
83 /*
84 * If the address can be translated, then that is as much
85 * uniqueness as we need. Make it the first component and return
86 */
87 reg = of_get_property(node, "reg", NULL);
88 if (reg && (addr = of_translate_address(node, reg)) != OF_BAD_ADDR) {
89 dev_set_name(dev, dev_name(dev) ? "%llx.%s:%s" : "%llx.%s",
90 (unsigned long long)addr, node->name,
91 dev_name(dev));
Grant Likely94c09312010-06-08 07:48:14 -060092 return;
93 }
Grant Likely94c09312010-06-08 07:48:14 -060094
Grant Likely07e461c2014-05-21 15:40:31 +090095 /* format arguments only used if dev_name() resolves to NULL */
96 dev_set_name(dev, dev_name(dev) ? "%s:%s" : "%s",
97 strrchr(node->full_name, '/') + 1, dev_name(dev));
98 node = node->parent;
Grant Likely94c09312010-06-08 07:48:14 -060099 }
Grant Likely94c09312010-06-08 07:48:14 -0600100}
101
102/**
103 * of_device_alloc - Allocate and initialize an of_device
104 * @np: device node to assign to device
105 * @bus_id: Name to assign to the device. May be null to use default name.
106 * @parent: Parent device.
107 */
Grant Likely94a0cb12010-07-22 13:59:23 -0600108struct platform_device *of_device_alloc(struct device_node *np,
Grant Likely94c09312010-06-08 07:48:14 -0600109 const char *bus_id,
110 struct device *parent)
111{
Grant Likely94a0cb12010-07-22 13:59:23 -0600112 struct platform_device *dev;
Andres Salomon52f65372010-10-10 21:35:05 -0600113 int rc, i, num_reg = 0, num_irq;
Grant Likelyac80a512010-06-08 07:48:15 -0600114 struct resource *res, temp_res;
Grant Likely94c09312010-06-08 07:48:14 -0600115
Grant Likely7096d042010-10-20 11:45:13 -0600116 dev = platform_device_alloc("", -1);
117 if (!dev)
118 return NULL;
119
120 /* count the io and irq resources */
Rob Herringd9c68662014-05-07 15:23:56 -0500121 while (of_address_to_resource(np, num_reg, &temp_res) == 0)
122 num_reg++;
Andres Salomon52f65372010-10-10 21:35:05 -0600123 num_irq = of_irq_count(np);
Grant Likelyac80a512010-06-08 07:48:15 -0600124
Grant Likelyac80a512010-06-08 07:48:15 -0600125 /* Populate the resource table */
126 if (num_irq || num_reg) {
Grant Likely7096d042010-10-20 11:45:13 -0600127 res = kzalloc(sizeof(*res) * (num_irq + num_reg), GFP_KERNEL);
128 if (!res) {
129 platform_device_put(dev);
130 return NULL;
131 }
132
Grant Likelyac80a512010-06-08 07:48:15 -0600133 dev->num_resources = num_reg + num_irq;
134 dev->resource = res;
135 for (i = 0; i < num_reg; i++, res++) {
136 rc = of_address_to_resource(np, i, res);
137 WARN_ON(rc);
138 }
Rob Herring9ec36ca2014-04-23 17:57:41 -0500139 if (of_irq_to_resource_table(np, res, num_irq) != num_irq)
140 pr_debug("not all legacy IRQ resources mapped for %s\n",
141 np->name);
Grant Likelyac80a512010-06-08 07:48:15 -0600142 }
Grant Likely94c09312010-06-08 07:48:14 -0600143
144 dev->dev.of_node = of_node_get(np);
Grant Likely43c07672014-11-04 10:26:26 +0000145 dev->dev.parent = parent ? : &platform_bus;
Grant Likely94c09312010-06-08 07:48:14 -0600146
147 if (bus_id)
148 dev_set_name(&dev->dev, "%s", bus_id);
149 else
150 of_device_make_bus_id(&dev->dev);
151
152 return dev;
153}
154EXPORT_SYMBOL(of_device_alloc);
155
Will Deacon97890ba2014-08-27 16:24:20 +0100156static void of_dma_deconfigure(struct device *dev)
157{
158 arch_teardown_dma_ops(dev);
Santosh Shilimkar591c1ee2014-04-24 11:30:04 -0400159}
160
161/**
Grant Likely15c35972011-06-21 10:59:35 -0600162 * of_platform_device_create_pdata - Alloc, initialize and register an of_device
Grant Likely5fd200f2010-06-08 07:48:13 -0600163 * @np: pointer to node to create device for
164 * @bus_id: name to assign device
Grant Likely15c35972011-06-21 10:59:35 -0600165 * @platform_data: pointer to populate platform_data pointer with
Grant Likely5fd200f2010-06-08 07:48:13 -0600166 * @parent: Linux device model parent device.
Grant Likelycd1e6502011-01-03 15:51:11 -0700167 *
168 * Returns pointer to created platform device, or NULL if a device was not
169 * registered. Unavailable devices will not get registered.
Grant Likely5fd200f2010-06-08 07:48:13 -0600170 */
Mark Brown245d9642013-07-01 20:26:52 +0100171static struct platform_device *of_platform_device_create_pdata(
Grant Likely15c35972011-06-21 10:59:35 -0600172 struct device_node *np,
173 const char *bus_id,
174 void *platform_data,
175 struct device *parent)
Grant Likely5fd200f2010-06-08 07:48:13 -0600176{
Grant Likely94a0cb12010-07-22 13:59:23 -0600177 struct platform_device *dev;
Grant Likely5fd200f2010-06-08 07:48:13 -0600178
Pawel Mollc6e126d2014-05-15 16:55:24 +0100179 if (!of_device_is_available(np) ||
180 of_node_test_and_set_flag(np, OF_POPULATED))
Grant Likelycd1e6502011-01-03 15:51:11 -0700181 return NULL;
182
Grant Likely5fd200f2010-06-08 07:48:13 -0600183 dev = of_device_alloc(np, bus_id, parent);
184 if (!dev)
Pawel Mollc6e126d2014-05-15 16:55:24 +0100185 goto err_clear_flag;
Grant Likely5fd200f2010-06-08 07:48:13 -0600186
Grant Likelyeca39302010-06-08 07:48:21 -0600187 dev->dev.bus = &platform_bus_type;
Grant Likely15c35972011-06-21 10:59:35 -0600188 dev->dev.platform_data = platform_data;
Murali Karicheri1f5c69a2015-03-03 12:52:09 -0500189 of_dma_configure(&dev->dev, dev->dev.of_node);
Marc Zyngierc706c232015-07-28 14:46:15 +0100190 of_msi_configure(&dev->dev, dev->dev.of_node);
Grant Likely5fd200f2010-06-08 07:48:13 -0600191
Grant Likely7096d042010-10-20 11:45:13 -0600192 if (of_device_add(dev) != 0) {
Will Deacon97890ba2014-08-27 16:24:20 +0100193 of_dma_deconfigure(&dev->dev);
Grant Likely7096d042010-10-20 11:45:13 -0600194 platform_device_put(dev);
Pawel Mollc6e126d2014-05-15 16:55:24 +0100195 goto err_clear_flag;
Grant Likely5fd200f2010-06-08 07:48:13 -0600196 }
197
198 return dev;
Pawel Mollc6e126d2014-05-15 16:55:24 +0100199
200err_clear_flag:
201 of_node_clear_flag(np, OF_POPULATED);
202 return NULL;
Grant Likely5fd200f2010-06-08 07:48:13 -0600203}
Grant Likely15c35972011-06-21 10:59:35 -0600204
205/**
206 * of_platform_device_create - Alloc, initialize and register an of_device
207 * @np: pointer to node to create device for
208 * @bus_id: name to assign device
209 * @parent: Linux device model parent device.
210 *
211 * Returns pointer to created platform device, or NULL if a device was not
212 * registered. Unavailable devices will not get registered.
213 */
214struct platform_device *of_platform_device_create(struct device_node *np,
215 const char *bus_id,
216 struct device *parent)
217{
218 return of_platform_device_create_pdata(np, bus_id, NULL, parent);
219}
Grant Likely5fd200f2010-06-08 07:48:13 -0600220EXPORT_SYMBOL(of_platform_device_create);
221
Grant Likely5de15402011-06-21 10:59:34 -0600222#ifdef CONFIG_ARM_AMBA
223static struct amba_device *of_amba_device_create(struct device_node *node,
224 const char *bus_id,
225 void *platform_data,
226 struct device *parent)
227{
228 struct amba_device *dev;
229 const void *prop;
230 int i, ret;
231
232 pr_debug("Creating amba device %s\n", node->full_name);
233
Pawel Mollc6e126d2014-05-15 16:55:24 +0100234 if (!of_device_is_available(node) ||
235 of_node_test_and_set_flag(node, OF_POPULATED))
Grant Likely5de15402011-06-21 10:59:34 -0600236 return NULL;
237
Russell Kingc0f72f82011-12-18 11:45:17 +0000238 dev = amba_device_alloc(NULL, 0, 0);
Rob Herring606ad422016-06-15 08:32:18 -0500239 if (!dev)
Pawel Mollc6e126d2014-05-15 16:55:24 +0100240 goto err_clear_flag;
Grant Likely5de15402011-06-21 10:59:34 -0600241
242 /* setup generic device info */
Grant Likely5de15402011-06-21 10:59:34 -0600243 dev->dev.of_node = of_node_get(node);
Grant Likely43c07672014-11-04 10:26:26 +0000244 dev->dev.parent = parent ? : &platform_bus;
Grant Likely5de15402011-06-21 10:59:34 -0600245 dev->dev.platform_data = platform_data;
246 if (bus_id)
247 dev_set_name(&dev->dev, "%s", bus_id);
248 else
249 of_device_make_bus_id(&dev->dev);
Murali Karicheri1f5c69a2015-03-03 12:52:09 -0500250 of_dma_configure(&dev->dev, dev->dev.of_node);
Grant Likely5de15402011-06-21 10:59:34 -0600251
Grant Likely5de15402011-06-21 10:59:34 -0600252 /* Allow the HW Peripheral ID to be overridden */
253 prop = of_get_property(node, "arm,primecell-periphid", NULL);
254 if (prop)
255 dev->periphid = of_read_ulong(prop, 1);
256
257 /* Decode the IRQs and address ranges */
258 for (i = 0; i < AMBA_NR_IRQS; i++)
259 dev->irq[i] = irq_of_parse_and_map(node, i);
260
261 ret = of_address_to_resource(node, 0, &dev->res);
Bartlomiej Zolnierkiewicz2bc552d2013-08-30 13:17:29 +0200262 if (ret) {
Rob Herring606ad422016-06-15 08:32:18 -0500263 pr_err("amba: of_address_to_resource() failed (%d) for %s\n",
264 ret, node->full_name);
Grant Likely5de15402011-06-21 10:59:34 -0600265 goto err_free;
Bartlomiej Zolnierkiewicz2bc552d2013-08-30 13:17:29 +0200266 }
Grant Likely5de15402011-06-21 10:59:34 -0600267
Russell Kingc0f72f82011-12-18 11:45:17 +0000268 ret = amba_device_add(dev, &iomem_resource);
Bartlomiej Zolnierkiewicz2bc552d2013-08-30 13:17:29 +0200269 if (ret) {
Rob Herring606ad422016-06-15 08:32:18 -0500270 pr_err("amba_device_add() failed (%d) for %s\n",
271 ret, node->full_name);
Grant Likely5de15402011-06-21 10:59:34 -0600272 goto err_free;
Bartlomiej Zolnierkiewicz2bc552d2013-08-30 13:17:29 +0200273 }
Grant Likely5de15402011-06-21 10:59:34 -0600274
275 return dev;
276
277err_free:
Russell Kingc0f72f82011-12-18 11:45:17 +0000278 amba_device_put(dev);
Pawel Mollc6e126d2014-05-15 16:55:24 +0100279err_clear_flag:
280 of_node_clear_flag(node, OF_POPULATED);
Grant Likely5de15402011-06-21 10:59:34 -0600281 return NULL;
282}
283#else /* CONFIG_ARM_AMBA */
284static struct amba_device *of_amba_device_create(struct device_node *node,
285 const char *bus_id,
286 void *platform_data,
287 struct device *parent)
288{
289 return NULL;
290}
291#endif /* CONFIG_ARM_AMBA */
292
Grant Likely5fd200f2010-06-08 07:48:13 -0600293/**
Grant Likely15c35972011-06-21 10:59:35 -0600294 * of_devname_lookup() - Given a device node, lookup the preferred Linux name
295 */
296static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup,
297 struct device_node *np)
298{
Tony Lindgrenfc5cf802016-04-15 08:45:32 -0700299 const struct of_dev_auxdata *auxdata;
Grant Likely15c35972011-06-21 10:59:35 -0600300 struct resource res;
Tony Lindgrenfc5cf802016-04-15 08:45:32 -0700301 int compatible = 0;
Olof Johansson303f59d2011-11-02 22:07:29 -0700302
303 if (!lookup)
304 return NULL;
305
Tony Lindgrenfc5cf802016-04-15 08:45:32 -0700306 auxdata = lookup;
307 for (; auxdata->compatible; auxdata++) {
308 if (!of_device_is_compatible(np, auxdata->compatible))
Olof Johansson303f59d2011-11-02 22:07:29 -0700309 continue;
Tony Lindgrenfc5cf802016-04-15 08:45:32 -0700310 compatible++;
Lee Jones84774e62012-07-05 15:15:36 +0100311 if (!of_address_to_resource(np, 0, &res))
Tony Lindgrenfc5cf802016-04-15 08:45:32 -0700312 if (res.start != auxdata->phys_addr)
Lee Jones84774e62012-07-05 15:15:36 +0100313 continue;
Tony Lindgrenfc5cf802016-04-15 08:45:32 -0700314 pr_debug("%s: devname=%s\n", np->full_name, auxdata->name);
315 return auxdata;
316 }
317
318 if (!compatible)
319 return NULL;
320
321 /* Try compatible match if no phys_addr and name are specified */
322 auxdata = lookup;
323 for (; auxdata->compatible; auxdata++) {
324 if (!of_device_is_compatible(np, auxdata->compatible))
325 continue;
326 if (!auxdata->phys_addr && !auxdata->name) {
327 pr_debug("%s: compatible match\n", np->full_name);
328 return auxdata;
329 }
Grant Likely15c35972011-06-21 10:59:35 -0600330 }
Olof Johansson303f59d2011-11-02 22:07:29 -0700331
Grant Likely15c35972011-06-21 10:59:35 -0600332 return NULL;
333}
334
335/**
Grant Likely38e9e212011-03-18 10:21:28 -0600336 * of_platform_bus_create() - Create a device for a node and its children.
Grant Likely5fd200f2010-06-08 07:48:13 -0600337 * @bus: device node of the bus to instantiate
Grant Likely1eed4c02011-03-18 10:21:29 -0600338 * @matches: match table for bus nodes
Olof Johansson303f59d2011-11-02 22:07:29 -0700339 * @lookup: auxdata table for matching id and platform_data with device nodes
Grant Likely38e9e212011-03-18 10:21:28 -0600340 * @parent: parent for new device, or NULL for top level.
Olof Johansson303f59d2011-11-02 22:07:29 -0700341 * @strict: require compatible property
Grant Likely38e9e212011-03-18 10:21:28 -0600342 *
343 * Creates a platform_device for the provided device_node, and optionally
344 * recursively create devices for all the child nodes.
Grant Likely5fd200f2010-06-08 07:48:13 -0600345 */
Grant Likely38e9e212011-03-18 10:21:28 -0600346static int of_platform_bus_create(struct device_node *bus,
Grant Likely5fd200f2010-06-08 07:48:13 -0600347 const struct of_device_id *matches,
Grant Likely15c35972011-06-21 10:59:35 -0600348 const struct of_dev_auxdata *lookup,
Grant Likely29d4f8a2011-06-21 10:59:34 -0600349 struct device *parent, bool strict)
Grant Likely5fd200f2010-06-08 07:48:13 -0600350{
Grant Likely15c35972011-06-21 10:59:35 -0600351 const struct of_dev_auxdata *auxdata;
Grant Likely5fd200f2010-06-08 07:48:13 -0600352 struct device_node *child;
Grant Likely94a0cb12010-07-22 13:59:23 -0600353 struct platform_device *dev;
Grant Likely15c35972011-06-21 10:59:35 -0600354 const char *bus_id = NULL;
355 void *platform_data = NULL;
Grant Likely5fd200f2010-06-08 07:48:13 -0600356 int rc = 0;
357
Grant Likely29d4f8a2011-06-21 10:59:34 -0600358 /* Make sure it has a compatible property */
359 if (strict && (!of_get_property(bus, "compatible", NULL))) {
360 pr_debug("%s() - skipping %s, no compatible prop\n",
361 __func__, bus->full_name);
362 return 0;
363 }
364
Kefeng Wang44a71852016-06-01 14:52:54 +0800365 if (of_node_check_flag(bus, OF_POPULATED_BUS)) {
366 pr_debug("%s() - skipping %s, already populated\n",
367 __func__, bus->full_name);
368 return 0;
369 }
370
Grant Likely15c35972011-06-21 10:59:35 -0600371 auxdata = of_dev_lookup(lookup, bus);
372 if (auxdata) {
373 bus_id = auxdata->name;
374 platform_data = auxdata->platform_data;
375 }
376
Grant Likely5de15402011-06-21 10:59:34 -0600377 if (of_device_is_compatible(bus, "arm,primecell")) {
Bartlomiej Zolnierkiewicz2bc552d2013-08-30 13:17:29 +0200378 /*
379 * Don't return an error here to keep compatibility with older
380 * device tree files.
381 */
Grant Likely15c35972011-06-21 10:59:35 -0600382 of_amba_device_create(bus, bus_id, platform_data, parent);
Grant Likely5de15402011-06-21 10:59:34 -0600383 return 0;
384 }
385
Grant Likely15c35972011-06-21 10:59:35 -0600386 dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent);
Grant Likely38e9e212011-03-18 10:21:28 -0600387 if (!dev || !of_match_node(matches, bus))
388 return 0;
389
Grant Likely5fd200f2010-06-08 07:48:13 -0600390 for_each_child_of_node(bus, child) {
391 pr_debug(" create child: %s\n", child->full_name);
Grant Likely15c35972011-06-21 10:59:35 -0600392 rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict);
Grant Likely5fd200f2010-06-08 07:48:13 -0600393 if (rc) {
394 of_node_put(child);
395 break;
396 }
397 }
Grant Likely75f353b2014-06-24 16:13:47 +0100398 of_node_set_flag(bus, OF_POPULATED_BUS);
Grant Likely5fd200f2010-06-08 07:48:13 -0600399 return rc;
400}
401
402/**
Grant Likely38e9e212011-03-18 10:21:28 -0600403 * of_platform_bus_probe() - Probe the device-tree for platform buses
Grant Likely5fd200f2010-06-08 07:48:13 -0600404 * @root: parent of the first level to probe or NULL for the root of the tree
Grant Likely1eed4c02011-03-18 10:21:29 -0600405 * @matches: match table for bus nodes
Grant Likely5fd200f2010-06-08 07:48:13 -0600406 * @parent: parent to hook devices from, NULL for toplevel
407 *
408 * Note that children of the provided root are not instantiated as devices
409 * unless the specified root itself matches the bus list and is not NULL.
410 */
411int of_platform_bus_probe(struct device_node *root,
412 const struct of_device_id *matches,
413 struct device *parent)
414{
415 struct device_node *child;
Grant Likely5fd200f2010-06-08 07:48:13 -0600416 int rc = 0;
417
Grant Likely1eed4c02011-03-18 10:21:29 -0600418 root = root ? of_node_get(root) : of_find_node_by_path("/");
419 if (!root)
Grant Likely60d59912010-06-08 07:48:25 -0600420 return -EINVAL;
Grant Likely5fd200f2010-06-08 07:48:13 -0600421
Kefeng Wang44a71852016-06-01 14:52:54 +0800422 pr_debug("%s()\n", __func__);
Grant Likely5fd200f2010-06-08 07:48:13 -0600423 pr_debug(" starting at: %s\n", root->full_name);
424
Grant Likely1eed4c02011-03-18 10:21:29 -0600425 /* Do a self check of bus type, if there's a match, create children */
Grant Likely5fd200f2010-06-08 07:48:13 -0600426 if (of_match_node(matches, root)) {
Grant Likely15c35972011-06-21 10:59:35 -0600427 rc = of_platform_bus_create(root, matches, NULL, parent, false);
Grant Likely38e9e212011-03-18 10:21:28 -0600428 } else for_each_child_of_node(root, child) {
Grant Likely5fd200f2010-06-08 07:48:13 -0600429 if (!of_match_node(matches, child))
430 continue;
Grant Likely15c35972011-06-21 10:59:35 -0600431 rc = of_platform_bus_create(child, matches, NULL, parent, false);
Julia Lawall7fad948a2015-10-22 11:02:49 +0200432 if (rc) {
433 of_node_put(child);
Grant Likely5fd200f2010-06-08 07:48:13 -0600434 break;
Julia Lawall7fad948a2015-10-22 11:02:49 +0200435 }
Grant Likely5fd200f2010-06-08 07:48:13 -0600436 }
Grant Likely38e9e212011-03-18 10:21:28 -0600437
Grant Likely5fd200f2010-06-08 07:48:13 -0600438 of_node_put(root);
439 return rc;
440}
441EXPORT_SYMBOL(of_platform_bus_probe);
Grant Likely29d4f8a2011-06-21 10:59:34 -0600442
443/**
444 * of_platform_populate() - Populate platform_devices from device tree data
445 * @root: parent of the first level to probe or NULL for the root of the tree
446 * @matches: match table, NULL to use the default
Javi Merino92039ed2012-11-23 16:25:08 +0000447 * @lookup: auxdata table for matching id and platform_data with device nodes
Grant Likely29d4f8a2011-06-21 10:59:34 -0600448 * @parent: parent to hook devices from, NULL for toplevel
449 *
450 * Similar to of_platform_bus_probe(), this function walks the device tree
451 * and creates devices from nodes. It differs in that it follows the modern
452 * convention of requiring all device nodes to have a 'compatible' property,
453 * and it is suitable for creating devices which are children of the root
454 * node (of_platform_bus_probe will only create children of the root which
455 * are selected by the @matches argument).
456 *
457 * New board support should be using this function instead of
458 * of_platform_bus_probe().
459 *
460 * Returns 0 on success, < 0 on failure.
461 */
462int of_platform_populate(struct device_node *root,
463 const struct of_device_id *matches,
Grant Likely15c35972011-06-21 10:59:35 -0600464 const struct of_dev_auxdata *lookup,
Grant Likely29d4f8a2011-06-21 10:59:34 -0600465 struct device *parent)
466{
467 struct device_node *child;
468 int rc = 0;
469
470 root = root ? of_node_get(root) : of_find_node_by_path("/");
471 if (!root)
472 return -EINVAL;
473
Kefeng Wang44a71852016-06-01 14:52:54 +0800474 pr_debug("%s()\n", __func__);
475 pr_debug(" starting at: %s\n", root->full_name);
476
Grant Likely29d4f8a2011-06-21 10:59:34 -0600477 for_each_child_of_node(root, child) {
Grant Likely15c35972011-06-21 10:59:35 -0600478 rc = of_platform_bus_create(child, matches, lookup, parent, true);
Julia Lawall7fad948a2015-10-22 11:02:49 +0200479 if (rc) {
480 of_node_put(child);
Grant Likely29d4f8a2011-06-21 10:59:34 -0600481 break;
Julia Lawall7fad948a2015-10-22 11:02:49 +0200482 }
Grant Likely29d4f8a2011-06-21 10:59:34 -0600483 }
Grant Likely2d0747c2014-11-19 22:35:39 +0000484 of_node_set_flag(root, OF_POPULATED_BUS);
Grant Likely29d4f8a2011-06-21 10:59:34 -0600485
486 of_node_put(root);
487 return rc;
488}
Stephen Warrene001f1c2012-06-07 17:57:36 -0600489EXPORT_SYMBOL_GPL(of_platform_populate);
Pawel Mollc6e126d2014-05-15 16:55:24 +0100490
Hauke Mehrtens43443ad2015-08-02 19:44:43 +0200491int of_platform_default_populate(struct device_node *root,
492 const struct of_dev_auxdata *lookup,
493 struct device *parent)
494{
495 return of_platform_populate(root, of_default_bus_match_table, lookup,
496 parent);
497}
498EXPORT_SYMBOL_GPL(of_platform_default_populate);
499
Kefeng Wang44a71852016-06-01 14:52:54 +0800500static int __init of_platform_default_populate_init(void)
501{
Kees Cook529182e2016-07-29 18:11:32 -0700502 struct device_node *node;
503
504 if (!of_have_populated_dt())
505 return -ENODEV;
506
507 /*
508 * Handle ramoops explicitly, since it is inside /reserved-memory,
509 * which lacks a "compatible" property.
510 */
511 node = of_find_node_by_path("/reserved-memory");
512 if (node) {
513 node = of_find_compatible_node(node, NULL, "ramoops");
514 if (node)
515 of_platform_device_create(node, NULL, NULL);
516 }
517
518 /* Populate everything else. */
519 of_platform_default_populate(NULL, NULL, NULL);
Kefeng Wang44a71852016-06-01 14:52:54 +0800520
521 return 0;
522}
523arch_initcall_sync(of_platform_default_populate_init);
524
Pawel Mollc6e126d2014-05-15 16:55:24 +0100525static int of_platform_device_destroy(struct device *dev, void *data)
526{
Pawel Mollc6e126d2014-05-15 16:55:24 +0100527 /* Do not touch devices not populated from the device tree */
Grant Likely75f353b2014-06-24 16:13:47 +0100528 if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED))
Pawel Mollc6e126d2014-05-15 16:55:24 +0100529 return 0;
Pawel Mollc6e126d2014-05-15 16:55:24 +0100530
Grant Likely75f353b2014-06-24 16:13:47 +0100531 /* Recurse for any nodes that were treated as busses */
532 if (of_node_check_flag(dev->of_node, OF_POPULATED_BUS))
533 device_for_each_child(dev, NULL, of_platform_device_destroy);
Pawel Mollc6e126d2014-05-15 16:55:24 +0100534
535 if (dev->bus == &platform_bus_type)
536 platform_device_unregister(to_platform_device(dev));
537#ifdef CONFIG_ARM_AMBA
538 else if (dev->bus == &amba_bustype)
539 amba_device_unregister(to_amba_device(dev));
540#endif
Pawel Mollc6e126d2014-05-15 16:55:24 +0100541
Will Deacon0495cb72015-01-16 17:04:56 +0000542 of_dma_deconfigure(dev);
Pawel Mollc6e126d2014-05-15 16:55:24 +0100543 of_node_clear_flag(dev->of_node, OF_POPULATED);
Grant Likely75f353b2014-06-24 16:13:47 +0100544 of_node_clear_flag(dev->of_node, OF_POPULATED_BUS);
Pawel Mollc6e126d2014-05-15 16:55:24 +0100545 return 0;
546}
547
548/**
549 * of_platform_depopulate() - Remove devices populated from device tree
Grant Likely75f353b2014-06-24 16:13:47 +0100550 * @parent: device which children will be removed
Pawel Mollc6e126d2014-05-15 16:55:24 +0100551 *
552 * Complementary to of_platform_populate(), this function removes children
553 * of the given device (and, recurrently, their children) that have been
554 * created from their respective device tree nodes (and only those,
555 * leaving others - eg. manually created - unharmed).
556 *
557 * Returns 0 when all children devices have been removed or
558 * -EBUSY when some children remained.
559 */
Grant Likely75f353b2014-06-24 16:13:47 +0100560void of_platform_depopulate(struct device *parent)
Pawel Mollc6e126d2014-05-15 16:55:24 +0100561{
Grant Likely2d0747c2014-11-19 22:35:39 +0000562 if (parent->of_node && of_node_check_flag(parent->of_node, OF_POPULATED_BUS)) {
563 device_for_each_child(parent, NULL, of_platform_device_destroy);
564 of_node_clear_flag(parent->of_node, OF_POPULATED_BUS);
565 }
Pawel Mollc6e126d2014-05-15 16:55:24 +0100566}
567EXPORT_SYMBOL_GPL(of_platform_depopulate);
568
Pantelis Antoniou801d7282014-10-28 22:36:01 +0200569#ifdef CONFIG_OF_DYNAMIC
570static int of_platform_notify(struct notifier_block *nb,
571 unsigned long action, void *arg)
572{
573 struct of_reconfig_data *rd = arg;
574 struct platform_device *pdev_parent, *pdev;
575 bool children_left;
576
577 switch (of_reconfig_get_state_change(action, rd)) {
578 case OF_RECONFIG_CHANGE_ADD:
579 /* verify that the parent is a bus */
580 if (!of_node_check_flag(rd->dn->parent, OF_POPULATED_BUS))
581 return NOTIFY_OK; /* not for us */
582
Pantelis Antoniou15204ab2014-12-16 19:45:26 +0200583 /* already populated? (driver using of_populate manually) */
584 if (of_node_check_flag(rd->dn, OF_POPULATED))
585 return NOTIFY_OK;
586
Pantelis Antoniou801d7282014-10-28 22:36:01 +0200587 /* pdev_parent may be NULL when no bus platform device */
588 pdev_parent = of_find_device_by_node(rd->dn->parent);
589 pdev = of_platform_device_create(rd->dn, NULL,
590 pdev_parent ? &pdev_parent->dev : NULL);
591 of_dev_put(pdev_parent);
592
593 if (pdev == NULL) {
594 pr_err("%s: failed to create for '%s'\n",
595 __func__, rd->dn->full_name);
596 /* of_platform_device_create tosses the error code */
597 return notifier_from_errno(-EINVAL);
598 }
599 break;
600
601 case OF_RECONFIG_CHANGE_REMOVE:
Pantelis Antoniou15204ab2014-12-16 19:45:26 +0200602
603 /* already depopulated? */
604 if (!of_node_check_flag(rd->dn, OF_POPULATED))
605 return NOTIFY_OK;
606
Pantelis Antoniou801d7282014-10-28 22:36:01 +0200607 /* find our device by node */
608 pdev = of_find_device_by_node(rd->dn);
609 if (pdev == NULL)
610 return NOTIFY_OK; /* no? not meant for us */
611
612 /* unregister takes one ref away */
613 of_platform_device_destroy(&pdev->dev, &children_left);
614
615 /* and put the reference of the find */
616 of_dev_put(pdev);
617 break;
618 }
619
620 return NOTIFY_OK;
621}
622
623static struct notifier_block platform_of_notifier = {
624 .notifier_call = of_platform_notify,
625};
626
627void of_platform_register_reconfig_notifier(void)
628{
629 WARN_ON(of_reconfig_notifier_register(&platform_of_notifier));
630}
631#endif /* CONFIG_OF_DYNAMIC */
632
Grant Likely964dba22012-02-24 14:58:34 -0700633#endif /* CONFIG_OF_ADDRESS */