1 /*
2 * Copyright (c) 2017 Google, Inc
3 * Written by Simon Glass <sjg@chromium.org>
4 *
5 * SPDX-License-Identifier: GPL-2.0+
6 */
7
8 #ifndef _DM_OFNODE_H
9 #define _DM_OFNODE_H
10
11 /* TODO(sjg@chromium.org): Drop fdtdec.h include */
12 #include <fdtdec.h>
13 #include <dm/of.h>
14
15 /* Enable checks to protect against invalid calls */
16 #undef OF_CHECKS
17
18 struct resource;
19
20 /**
21 * ofnode - reference to a device tree node
22 *
23 * This union can hold either a straightforward pointer to a struct device_node
24 * in the live device tree, or an offset within the flat device tree. In the
25 * latter case, the pointer value is just the integer offset within the flat DT.
26 *
27 * Thus we can reference nodes in both the live tree (once available) and the
28 * flat tree (until then). Functions are available to translate between an
29 * ofnode and either an offset or a struct device_node *.
30 *
31 * The reference can also hold a null offset, in which case the pointer value
32 * here is NULL. This corresponds to a struct device_node * value of
33 * NULL, or an offset of -1.
34 *
35 * There is no ambiguity as to whether ofnode holds an offset or a node
36 * pointer: when the live tree is active it holds a node pointer, otherwise it
37 * holds an offset. The value itself does not need to be unique and in theory
38 * the same value could point to a valid device node or a valid offset. We
39 * could arrange for a unique value to be used (e.g. by making the pointer
40 * point to an offset within the flat device tree in the case of an offset) but
41 * this increases code size slightly due to the subtraction. Since it offers no
42 * real benefit, the approach described here seems best.
43 *
44 * For now these points use constant types, since we don't allow writing
45 * the DT.
46 *
47 * @np: Pointer to device node, used for live tree
48 * @of_offset: Pointer into flat device tree, used for flat tree. Note that this
49 * is not a really a pointer to a node: it is an offset value. See above.
50 */
51 typedef union ofnode_union {
52 const struct device_node *np; /* will be used for future live tree */
53 long of_offset;
54 } ofnode;
55
56 struct ofnode_phandle_args {
57 ofnode node;
58 int args_count;
59 uint32_t args[OF_MAX_PHANDLE_ARGS];
60 };
61
62 /**
63 * ofprop - reference to a property of a device tree node
64 *
65 * This struct hold the reference on one property of one node,
66 * using struct ofnode and an offset within the flat device tree or either
67 * a pointer to a struct property in the live device tree.
68 *
69 * Thus we can reference arguments in both the live tree and the flat tree.
70 *
71 * The property reference can also hold a null reference. This corresponds to
72 * a struct property NULL pointer or an offset of -1.
73 *
74 * @node: Pointer to device node
75 * @offset: Pointer into flat device tree, used for flat tree.
76 * @prop: Pointer to property, used for live treee.
77 */
78
79 struct ofprop {
80 ofnode node;
81 union {
82 int offset;
83 const struct property *prop;
84 };
85 };
86
87 /**
88 * _ofnode_to_np() - convert an ofnode to a live DT node pointer
89 *
90 * This cannot be called if the reference contains an offset.
91 *
92 * @node: Reference containing struct device_node * (possibly invalid)
93 * @return pointer to device node (can be NULL)
94 */
ofnode_to_np(ofnode node)95 static inline const struct device_node *ofnode_to_np(ofnode node)
96 {
97 #ifdef OF_CHECKS
98 if (!of_live_active())
99 return NULL;
100 #endif
101 return node.np;
102 }
103
104 /**
105 * ofnode_to_offset() - convert an ofnode to a flat DT offset
106 *
107 * This cannot be called if the reference contains a node pointer.
108 *
109 * @node: Reference containing offset (possibly invalid)
110 * @return DT offset (can be -1)
111 */
ofnode_to_offset(ofnode node)112 static inline int ofnode_to_offset(ofnode node)
113 {
114 #ifdef OF_CHECKS
115 if (of_live_active())
116 return -1;
117 #endif
118 return node.of_offset;
119 }
120
121 /**
122 * ofnode_valid() - check if an ofnode is valid
123 *
124 * @return true if the reference contains a valid ofnode, false if it is NULL
125 */
ofnode_valid(ofnode node)126 static inline bool ofnode_valid(ofnode node)
127 {
128 if (of_live_active())
129 return node.np != NULL;
130 else
131 return node.of_offset != -1;
132 }
133
134 /**
135 * offset_to_ofnode() - convert a DT offset to an ofnode
136 *
137 * @of_offset: DT offset (either valid, or -1)
138 * @return reference to the associated DT offset
139 */
offset_to_ofnode(int of_offset)140 static inline ofnode offset_to_ofnode(int of_offset)
141 {
142 ofnode node;
143
144 if (of_live_active())
145 node.np = NULL;
146 else
147 node.of_offset = of_offset;
148
149 return node;
150 }
151
152 /**
153 * np_to_ofnode() - convert a node pointer to an ofnode
154 *
155 * @np: Live node pointer (can be NULL)
156 * @return reference to the associated node pointer
157 */
np_to_ofnode(const struct device_node * np)158 static inline ofnode np_to_ofnode(const struct device_node *np)
159 {
160 ofnode node;
161
162 node.np = np;
163
164 return node;
165 }
166
167 /**
168 * ofnode_is_np() - check if a reference is a node pointer
169 *
170 * This function associated that if there is a valid live tree then all
171 * references will use it. This is because using the flat DT when the live tree
172 * is valid is not permitted.
173 *
174 * @node: reference to check (possibly invalid)
175 * @return true if the reference is a live node pointer, false if it is a DT
176 * offset
177 */
ofnode_is_np(ofnode node)178 static inline bool ofnode_is_np(ofnode node)
179 {
180 #ifdef OF_CHECKS
181 /*
182 * Check our assumption that flat tree offsets are not used when a
183 * live tree is in use.
184 */
185 assert(!ofnode_valid(node) ||
186 (of_live_active() ? _ofnode_to_np(node)
187 : _ofnode_to_np(node)));
188 #endif
189 return of_live_active() && ofnode_valid(node);
190 }
191
192 /**
193 * ofnode_equal() - check if two references are equal
194 *
195 * @return true if equal, else false
196 */
ofnode_equal(ofnode ref1,ofnode ref2)197 static inline bool ofnode_equal(ofnode ref1, ofnode ref2)
198 {
199 /* We only need to compare the contents */
200 return ref1.of_offset == ref2.of_offset;
201 }
202
203 /**
204 * ofnode_null() - Obtain a null ofnode
205 *
206 * This returns an ofnode which points to no node. It works both with the flat
207 * tree and livetree.
208 */
ofnode_null(void)209 static inline ofnode ofnode_null(void)
210 {
211 ofnode node;
212
213 if (of_live_active())
214 node.np = NULL;
215 else
216 node.of_offset = -1;
217
218 return node;
219 }
220
221 /**
222 * ofnode_read_u32() - Read a 32-bit integer from a property
223 *
224 * @ref: valid node reference to read property from
225 * @propname: name of the property to read from
226 * @outp: place to put value (if found)
227 * @return 0 if OK, -ve on error
228 */
229 int ofnode_read_u32(ofnode node, const char *propname, u32 *outp);
230
231 /**
232 * ofnode_read_s32() - Read a 32-bit integer from a property
233 *
234 * @ref: valid node reference to read property from
235 * @propname: name of the property to read from
236 * @outp: place to put value (if found)
237 * @return 0 if OK, -ve on error
238 */
ofnode_read_s32(ofnode node,const char * propname,s32 * out_value)239 static inline int ofnode_read_s32(ofnode node, const char *propname,
240 s32 *out_value)
241 {
242 return ofnode_read_u32(node, propname, (u32 *)out_value);
243 }
244
245 /**
246 * ofnode_read_u32_default() - Read a 32-bit integer from a property
247 *
248 * @ref: valid node reference to read property from
249 * @propname: name of the property to read from
250 * @def: default value to return if the property has no value
251 * @return property value, or @def if not found
252 */
253 int ofnode_read_u32_default(ofnode ref, const char *propname, u32 def);
254
255 /**
256 * ofnode_read_u64() - Read a 64-bit integer from a property
257 *
258 * @ref: valid node reference to read property from
259 * @propname: name of the property to read from
260 * @outp: place to put value (if found)
261 * @return 0 if OK, -ve on error
262 */
263 int ofnode_read_u64(ofnode node, const char *propname, u64 *outp);
264
265 /**
266 * ofnode_read_s32_default() - Read a 32-bit integer from a property
267 *
268 * @ref: valid node reference to read property from
269 * @propname: name of the property to read from
270 * @def: default value to return if the property has no value
271 * @return property value, or @def if not found
272 */
273 int ofnode_read_s32_default(ofnode node, const char *propname, s32 def);
274
275 /**
276 * ofnode_read_string() - Read a string from a property
277 *
278 * @ref: valid node reference to read property from
279 * @propname: name of the property to read
280 * @return string from property value, or NULL if there is no such property
281 */
282 const char *ofnode_read_string(ofnode node, const char *propname);
283
284 /**
285 * ofnode_read_u32_array() - Find and read an array of 32 bit integers
286 *
287 * @node: valid node reference to read property from
288 * @propname: name of the property to read
289 * @out_values: pointer to return value, modified only if return value is 0
290 * @sz: number of array elements to read
291 *
292 * Search for a property in a device node and read 32-bit value(s) from
293 * it. Returns 0 on success, -EINVAL if the property does not exist,
294 * -ENODATA if property does not have a value, and -EOVERFLOW if the
295 * property data isn't large enough.
296 *
297 * The out_values is modified only if a valid u32 value can be decoded.
298 */
299 int ofnode_read_u32_array(ofnode node, const char *propname,
300 u32 *out_values, size_t sz);
301
302 /**
303 * ofnode_write_u32_array() - Find and write an array of 32 bit integers
304 *
305 * @node: valid node reference to read property from
306 * @propname: name of the property to read
307 * @values: pointer to update value, modified only if return value is 0
308 * @sz: number of array elements to read
309 * @return 0 on success, -EINVAL if the property does not exist, -ENODATA
310 * if property does not have a value, and -EOVERFLOW is longer than sz.
311 */
312 int ofnode_write_u32_array(ofnode node, const char *propname,
313 u32 *values, size_t sz);
314
315 /**
316 * ofnode_read_bool() - read a boolean value from a property
317 *
318 * @node: valid node reference to read property from
319 * @propname: name of property to read
320 * @return true if property is present (meaning true), false if not present
321 */
322 bool ofnode_read_bool(ofnode node, const char *propname);
323
324 /**
325 * ofnode_find_subnode() - find a named subnode of a parent node
326 *
327 * @node: valid reference to parent node
328 * @subnode_name: name of subnode to find
329 * @return reference to subnode (which can be invalid if there is no such
330 * subnode)
331 */
332 ofnode ofnode_find_subnode(ofnode node, const char *subnode_name);
333
334 /**
335 * ofnode_first_subnode() - find the first subnode of a parent node
336 *
337 * @node: valid reference to a valid parent node
338 * @return reference to the first subnode (which can be invalid if the parent
339 * node has no subnodes)
340 */
341 ofnode ofnode_first_subnode(ofnode node);
342
343 /**
344 * ofnode_next_subnode() - find the next sibling of a subnode
345 *
346 * @node: valid reference to previous node (sibling)
347 * @return reference to the next subnode (which can be invalid if the node
348 * has no more siblings)
349 */
350 ofnode ofnode_next_subnode(ofnode node);
351
352 /**
353 * ofnode_get_parent() - get the ofnode's parent (enclosing ofnode)
354 *
355 * @node: valid node to look up
356 * @return ofnode reference of the parent node
357 */
358 ofnode ofnode_get_parent(ofnode node);
359
360 /**
361 * ofnode_get_name() - get the name of a node
362 *
363 * @node: valid node to look up
364 * @return name or node
365 */
366 const char *ofnode_get_name(ofnode node);
367
368 /**
369 * ofnode_get_by_phandle() - get ofnode from phandle
370 *
371 * @phandle: phandle to look up
372 * @return ofnode reference to the phandle
373 */
374 ofnode ofnode_get_by_phandle(uint phandle);
375
376 /**
377 * ofnode_read_size() - read the size of a property
378 *
379 * @node: node to check
380 * @propname: property to check
381 * @return size of property if present, or -EINVAL if not
382 */
383 int ofnode_read_size(ofnode node, const char *propname);
384
385 /**
386 * ofnode_get_addr_index() - get an address from a node
387 *
388 * This reads the register address from a node
389 *
390 * @node: node to read from
391 * @index: Index of address to read (0 for first)
392 * @return address, or FDT_ADDR_T_NONE if not present or invalid
393 */
394 phys_addr_t ofnode_get_addr_index(ofnode node, int index);
395
396 /**
397 * ofnode_get_addr() - get an address from a node
398 *
399 * This reads the register address from a node
400 *
401 * @node: node to read from
402 * @return address, or FDT_ADDR_T_NONE if not present or invalid
403 */
404 phys_addr_t ofnode_get_addr(ofnode node);
405
406 /**
407 * ofnode_stringlist_search() - find a string in a string list and return index
408 *
409 * Note that it is possible for this function to succeed on property values
410 * that are not NUL-terminated. That's because the function will stop after
411 * finding the first occurrence of @string. This can for example happen with
412 * small-valued cell properties, such as #address-cells, when searching for
413 * the empty string.
414 *
415 * @node: node to check
416 * @propname: name of the property containing the string list
417 * @string: string to look up in the string list
418 *
419 * @return:
420 * the index of the string in the list of strings
421 * -ENODATA if the property is not found
422 * -EINVAL on some other error
423 */
424 int ofnode_stringlist_search(ofnode node, const char *propname,
425 const char *string);
426
427 /**
428 * ofnode_read_string_index() - obtain an indexed string from a string list
429 *
430 * Note that this will successfully extract strings from properties with
431 * non-NUL-terminated values. For example on small-valued cell properties
432 * this function will return the empty string.
433 *
434 * If non-NULL, the length of the string (on success) or a negative error-code
435 * (on failure) will be stored in the integer pointer to by lenp.
436 *
437 * @node: node to check
438 * @propname: name of the property containing the string list
439 * @index: index of the string to return
440 * @lenp: return location for the string length or an error code on failure
441 *
442 * @return:
443 * length of string, if found or -ve error value if not found
444 */
445 int ofnode_read_string_index(ofnode node, const char *propname, int index,
446 const char **outp);
447
448 /**
449 * ofnode_read_string_count() - find the number of strings in a string list
450 *
451 * @node: node to check
452 * @propname: name of the property containing the string list
453 * @return:
454 * number of strings in the list, or -ve error value if not found
455 */
456 int ofnode_read_string_count(ofnode node, const char *property);
457
458 /**
459 * ofnode_parse_phandle_with_args() - Find a node pointed by phandle in a list
460 *
461 * This function is useful to parse lists of phandles and their arguments.
462 * Returns 0 on success and fills out_args, on error returns appropriate
463 * errno value.
464 *
465 * Caller is responsible to call of_node_put() on the returned out_args->np
466 * pointer.
467 *
468 * Example:
469 *
470 * phandle1: node1 {
471 * #list-cells = <2>;
472 * }
473 *
474 * phandle2: node2 {
475 * #list-cells = <1>;
476 * }
477 *
478 * node3 {
479 * list = <&phandle1 1 2 &phandle2 3>;
480 * }
481 *
482 * To get a device_node of the `node2' node you may call this:
483 * ofnode_parse_phandle_with_args(node3, "list", "#list-cells", 0, 1, &args);
484 *
485 * @node: device tree node containing a list
486 * @list_name: property name that contains a list
487 * @cells_name: property name that specifies phandles' arguments count
488 * @cells_count: Cell count to use if @cells_name is NULL
489 * @index: index of a phandle to parse out
490 * @out_args: optional pointer to output arguments structure (will be filled)
491 * @return 0 on success (with @out_args filled out if not NULL), -ENOENT if
492 * @list_name does not exist, -EINVAL if a phandle was not found,
493 * @cells_name could not be found, the arguments were truncated or there
494 * were too many arguments.
495 */
496 int ofnode_parse_phandle_with_args(ofnode node, const char *list_name,
497 const char *cells_name, int cell_count,
498 int index,
499 struct ofnode_phandle_args *out_args);
500
501 /**
502 * ofnode_count_phandle_with_args() - Count number of phandle in a list
503 *
504 * This function is useful to count phandles into a list.
505 * Returns number of phandle on success, on error returns appropriate
506 * errno value.
507 *
508 * @node: device tree node containing a list
509 * @list_name: property name that contains a list
510 * @cells_name: property name that specifies phandles' arguments count
511 * @return number of phandle on success, -ENOENT if @list_name does not
512 * exist, -EINVAL if a phandle was not found, @cells_name could not
513 * be found.
514 */
515 int ofnode_count_phandle_with_args(ofnode node, const char *list_name,
516 const char *cells_name);
517
518 /**
519 * ofnode_path() - find a node by full path
520 *
521 * @path: Full path to node, e.g. "/bus/spi@1"
522 * @return reference to the node found. Use ofnode_valid() to check if it exists
523 */
524 ofnode ofnode_path(const char *path);
525
526 /**
527 * ofnode_get_chosen_prop() - get the value of a chosen property
528 *
529 * This looks for a property within the /chosen node and returns its value
530 *
531 * @propname: Property name to look for
532 */
533 const char *ofnode_get_chosen_prop(const char *propname);
534
535 /**
536 * ofnode_get_chosen_node() - get the chosen node
537 *
538 * @return the chosen node if present, else ofnode_null()
539 */
540 ofnode ofnode_get_chosen_node(const char *name);
541
542 struct display_timing;
543 /**
544 * ofnode_decode_display_timing() - decode display timings
545 *
546 * Decode display timings from the supplied 'display-timings' node.
547 * See doc/device-tree-bindings/video/display-timing.txt for binding
548 * information.
549 *
550 * @node 'display-timing' node containing the timing subnodes
551 * @index Index number to read (0=first timing subnode)
552 * @config Place to put timings
553 * @return 0 if OK, -FDT_ERR_NOTFOUND if not found
554 */
555 int ofnode_decode_display_timing(ofnode node, int index,
556 struct display_timing *config);
557
558 /**
559 * ofnode_get_property() - get a pointer to the value of a node property
560 *
561 * @node: node to read
562 * @propname: property to read
563 * @lenp: place to put length on success
564 * @return pointer to property, or NULL if not found
565 */
566 const void *ofnode_get_property(ofnode node, const char *propname, int *lenp);
567
568 /**
569 * ofnode_get_first_property()- get the reference of the first property
570 *
571 * Get reference to the first property of the node, it is used to iterate
572 * and read all the property with ofnode_get_property_by_prop().
573 *
574 * @node: node to read
575 * @prop: place to put argument reference
576 * @return 0 if OK, -ve on error. -FDT_ERR_NOTFOUND if not found
577 */
578 int ofnode_get_first_property(ofnode node, struct ofprop *prop);
579
580 /**
581 * ofnode_get_next_property() - get the reference of the next property
582 *
583 * Get reference to the next property of the node, it is used to iterate
584 * and read all the property with ofnode_get_property_by_prop().
585 *
586 * @prop: reference of current argument and place to put reference of next one
587 * @return 0 if OK, -ve on error. -FDT_ERR_NOTFOUND if not found
588 */
589 int ofnode_get_next_property(struct ofprop *prop);
590
591 /**
592 * ofnode_get_property_by_prop() - get a pointer to the value of a property
593 *
594 * Get value for the property identified by the provided reference.
595 *
596 * @prop: reference on property
597 * @propname: If non-NULL, place to property name on success,
598 * @lenp: If non-NULL, place to put length on success
599 * @return 0 if OK, -ve on error. -FDT_ERR_NOTFOUND if not found
600 */
601 const void *ofnode_get_property_by_prop(const struct ofprop *prop,
602 const char **propname, int *lenp);
603
604 /**
605 * ofnode_is_available() - check if a node is marked available
606 *
607 * @node: node to check
608 * @return true if node's 'status' property is "okay" (or is missing)
609 */
610 bool ofnode_is_available(ofnode node);
611
612 /**
613 * ofnode_get_addr_size() - get address and size from a property
614 *
615 * This does no address translation. It simply reads an property that contains
616 * an address and a size value, one after the other.
617 *
618 * @node: node to read from
619 * @propname: property to read
620 * @sizep: place to put size value (on success)
621 * @return address value, or FDT_ADDR_T_NONE on error
622 */
623 phys_addr_t ofnode_get_addr_size(ofnode node, const char *propname,
624 phys_size_t *sizep);
625
626 /**
627 * ofnode_read_u8_array_ptr() - find an 8-bit array
628 *
629 * Look up a property in a node and return a pointer to its contents as a
630 * byte array of given length. The property must have at least enough data
631 * for the array (count bytes). It may have more, but this will be ignored.
632 * The data is not copied.
633 *
634 * @node node to examine
635 * @propname name of property to find
636 * @sz number of array elements
637 * @return pointer to byte array if found, or NULL if the property is not
638 * found or there is not enough data
639 */
640 const uint8_t *ofnode_read_u8_array_ptr(ofnode node, const char *propname,
641 size_t sz);
642
643 /**
644 * ofnode_read_pci_addr() - look up a PCI address
645 *
646 * Look at an address property in a node and return the PCI address which
647 * corresponds to the given type in the form of fdt_pci_addr.
648 * The property must hold one fdt_pci_addr with a lengh.
649 *
650 * @node node to examine
651 * @type pci address type (FDT_PCI_SPACE_xxx)
652 * @propname name of property to find
653 * @addr returns pci address in the form of fdt_pci_addr
654 * @return 0 if ok, -ENOENT if the property did not exist, -EINVAL if the
655 * format of the property was invalid, -ENXIO if the requested
656 * address type was not found
657 */
658 int ofnode_read_pci_addr(ofnode node, enum fdt_pci_space type,
659 const char *propname, struct fdt_pci_addr *addr);
660
661 /**
662 * ofnode_read_addr_cells() - Get the number of address cells for a node
663 *
664 * This walks back up the tree to find the closest #address-cells property
665 * which controls the given node.
666 *
667 * @node: Node to check
668 * @return number of address cells this node uses
669 */
670 int ofnode_read_addr_cells(ofnode node);
671
672 /**
673 * ofnode_read_size_cells() - Get the number of size cells for a node
674 *
675 * This walks back up the tree to find the closest #size-cells property
676 * which controls the given node.
677 *
678 * @node: Node to check
679 * @return number of size cells this node uses
680 */
681 int ofnode_read_size_cells(ofnode node);
682
683 /**
684 * ofnode_read_simple_addr_cells() - Get the address cells property in a node
685 *
686 * This function matches fdt_address_cells().
687 *
688 * @np: Node pointer to check
689 * @return value of #address-cells property in this node, or 2 if none
690 */
691 int ofnode_read_simple_addr_cells(ofnode node);
692
693 /**
694 * ofnode_read_simple_size_cells() - Get the size cells property in a node
695 *
696 * This function matches fdt_size_cells().
697 *
698 * @np: Node pointer to check
699 * @return value of #size-cells property in this node, or 2 if none
700 */
701 int ofnode_read_simple_size_cells(ofnode node);
702
703 /**
704 * ofnode_pre_reloc() - check if a node should be bound before relocation
705 *
706 * Device tree nodes can be marked as needing-to-be-bound in the loader stages
707 * via special device tree properties.
708 *
709 * Before relocation this function can be used to check if nodes are required
710 * in either SPL or TPL stages.
711 *
712 * After relocation and jumping into the real U-Boot binary it is possible to
713 * determine if a node was bound in one of SPL/TPL stages.
714 *
715 * There are 3 settings currently in use
716 * -
717 * - u-boot,dm-pre-reloc: legacy and indicates any of TPL or SPL
718 * Existing platforms only use it to indicate nodes needed in
719 * SPL. Should probably be replaced by u-boot,dm-spl for
720 * new platforms.
721 *
722 * @node: node to check
723 * @eturns true if node is needed in SPL/TL, false otherwise
724 */
725 bool ofnode_pre_reloc(ofnode node);
726
727 int ofnode_read_resource(ofnode node, uint index, struct resource *res);
728 int ofnode_read_resource_byname(ofnode node, const char *name,
729 struct resource *res);
730
731 /**
732 * ofnode_for_each_subnode() - iterate over all subnodes of a parent
733 *
734 * @node: child node (ofnode, lvalue)
735 * @parent: parent node (ofnode)
736 *
737 * This is a wrapper around a for loop and is used like so:
738 *
739 * ofnode node;
740 *
741 * ofnode_for_each_subnode(node, parent) {
742 * Use node
743 * ...
744 * }
745 *
746 * Note that this is implemented as a macro and @node is used as
747 * iterator in the loop. The parent variable can be a constant or even a
748 * literal.
749 */
750 #define ofnode_for_each_subnode(node, parent) \
751 for (node = ofnode_first_subnode(parent); \
752 ofnode_valid(node); \
753 node = ofnode_next_subnode(node))
754
755 /**
756 * ofnode_translate_address() - Tranlate a device-tree address
757 *
758 * Translate an address from the device-tree into a CPU physical address. This
759 * function walks up the tree and applies the various bus mappings along the
760 * way.
761 *
762 * @ofnode: Device tree node giving the context in which to translate the
763 * address
764 * @in_addr: pointer to the address to translate
765 * @return the translated address; OF_BAD_ADDR on error
766 */
767 u64 ofnode_translate_address(ofnode node, const fdt32_t *in_addr);
768 #endif
769