2 * Copyright (c) 2011 The Chromium OS Authors.
3 * SPDX-License-Identifier: GPL-2.0+
10 * This file contains convenience functions for decoding useful and
11 * enlightening information from FDTs. It is intended to be used by device
12 * drivers and board-specific code within U-Boot. It aims to reduce the
13 * amount of FDT munging required within U-Boot itself, so that driver code
14 * changes to support FDT are minimized.
20 * A typedef for a physical address. Note that fdt data is always big
21 * endian even on a litle endian machine.
23 #ifdef CONFIG_PHYS_64BIT
24 typedef u64 fdt_addr_t;
25 typedef u64 fdt_size_t;
26 #define FDT_ADDR_T_NONE (-1ULL)
27 #define fdt_addr_to_cpu(reg) be64_to_cpu(reg)
28 #define fdt_size_to_cpu(reg) be64_to_cpu(reg)
30 typedef u32 fdt_addr_t;
31 typedef u32 fdt_size_t;
32 #define FDT_ADDR_T_NONE (-1U)
33 #define fdt_addr_to_cpu(reg) be32_to_cpu(reg)
34 #define fdt_size_to_cpu(reg) be32_to_cpu(reg)
37 /* Information obtained about memory from the FDT */
44 * Information about a resource. start is the first address of the resource
45 * and end is the last address (inclusive). The length of the resource will
46 * be equal to: end - start + 1.
54 * Compute the size of a resource.
56 * @param res the resource to operate on
57 * @return the size of the resource
59 static inline fdt_size_t fdt_resource_size(const struct fdt_resource *res)
61 return res->end - res->start + 1;
65 * Compat types that we know about and for which we might have drivers.
66 * Each is named COMPAT_<dir>_<filename> where <dir> is the directory
71 COMPAT_NVIDIA_TEGRA20_USB, /* Tegra20 USB port */
72 COMPAT_NVIDIA_TEGRA30_USB, /* Tegra30 USB port */
73 COMPAT_NVIDIA_TEGRA114_USB, /* Tegra114 USB port */
74 COMPAT_NVIDIA_TEGRA114_I2C, /* Tegra114 I2C w/single clock source */
75 COMPAT_NVIDIA_TEGRA20_I2C, /* Tegra20 i2c */
76 COMPAT_NVIDIA_TEGRA20_DVC, /* Tegra20 dvc (really just i2c) */
77 COMPAT_NVIDIA_TEGRA20_EMC, /* Tegra20 memory controller */
78 COMPAT_NVIDIA_TEGRA20_EMC_TABLE, /* Tegra20 memory timing table */
79 COMPAT_NVIDIA_TEGRA20_KBC, /* Tegra20 Keyboard */
80 COMPAT_NVIDIA_TEGRA20_NAND, /* Tegra2 NAND controller */
81 COMPAT_NVIDIA_TEGRA20_PWM, /* Tegra 2 PWM controller */
82 COMPAT_NVIDIA_TEGRA20_DC, /* Tegra 2 Display controller */
83 COMPAT_NVIDIA_TEGRA124_SDMMC, /* Tegra124 SDMMC controller */
84 COMPAT_NVIDIA_TEGRA30_SDMMC, /* Tegra30 SDMMC controller */
85 COMPAT_NVIDIA_TEGRA20_SDMMC, /* Tegra20 SDMMC controller */
86 COMPAT_NVIDIA_TEGRA20_SFLASH, /* Tegra 2 SPI flash controller */
87 COMPAT_NVIDIA_TEGRA20_SLINK, /* Tegra 2 SPI SLINK controller */
88 COMPAT_NVIDIA_TEGRA114_SPI, /* Tegra 114 SPI controller */
89 COMPAT_SMSC_LAN9215, /* SMSC 10/100 Ethernet LAN9215 */
90 COMPAT_SAMSUNG_EXYNOS5_SROMC, /* Exynos5 SROMC */
91 COMPAT_SAMSUNG_S3C2440_I2C, /* Exynos I2C Controller */
92 COMPAT_SAMSUNG_EXYNOS5_SOUND, /* Exynos Sound */
93 COMPAT_WOLFSON_WM8994_CODEC, /* Wolfson WM8994 Sound Codec */
94 COMPAT_SAMSUNG_EXYNOS_SPI, /* Exynos SPI */
95 COMPAT_GOOGLE_CROS_EC, /* Google CROS_EC Protocol */
96 COMPAT_GOOGLE_CROS_EC_KEYB, /* Google CROS_EC Keyboard */
97 COMPAT_SAMSUNG_EXYNOS_EHCI, /* Exynos EHCI controller */
98 COMPAT_SAMSUNG_EXYNOS5_XHCI, /* Exynos5 XHCI controller */
99 COMPAT_SAMSUNG_EXYNOS_USB_PHY, /* Exynos phy controller for usb2.0 */
100 COMPAT_SAMSUNG_EXYNOS5_USB3_PHY,/* Exynos phy controller for usb3.0 */
101 COMPAT_SAMSUNG_EXYNOS_TMU, /* Exynos TMU */
102 COMPAT_SAMSUNG_EXYNOS_FIMD, /* Exynos Display controller */
103 COMPAT_SAMSUNG_EXYNOS_MIPI_DSI, /* Exynos mipi dsi */
104 COMPAT_SAMSUNG_EXYNOS5_DP, /* Exynos Display port controller */
105 COMPAT_SAMSUNG_EXYNOS_DWMMC, /* Exynos DWMMC controller */
106 COMPAT_SAMSUNG_EXYNOS_MMC, /* Exynos MMC controller */
107 COMPAT_SAMSUNG_EXYNOS_SERIAL, /* Exynos UART */
108 COMPAT_MAXIM_MAX77686_PMIC, /* MAX77686 PMIC */
109 COMPAT_GENERIC_SPI_FLASH, /* Generic SPI Flash chip */
110 COMPAT_MAXIM_98095_CODEC, /* MAX98095 Codec */
111 COMPAT_INFINEON_SLB9635_TPM, /* Infineon SLB9635 TPM */
112 COMPAT_INFINEON_SLB9645_TPM, /* Infineon SLB9645 TPM */
113 COMPAT_SAMSUNG_EXYNOS5_I2C, /* Exynos5 High Speed I2C Controller */
114 COMPAT_SANDBOX_HOST_EMULATION, /* Sandbox emulation of a function */
115 COMPAT_SANDBOX_LCD_SDL, /* Sandbox LCD emulation with SDL */
116 COMPAT_TI_TPS65090, /* Texas Instrument TPS65090 */
117 COMPAT_NXP_PTN3460, /* NXP PTN3460 DP/LVDS bridge */
118 COMPAT_SAMSUNG_EXYNOS_SYSMMU, /* Exynos sysmmu */
119 COMPAT_PARADE_PS8625, /* Parade PS8622 EDP->LVDS bridge */
120 COMPAT_INTEL_LPC, /* Intel Low Pin Count I/F */
121 COMPAT_INTEL_MICROCODE, /* Intel microcode update */
122 COMPAT_MEMORY_SPD, /* Memory SPD information */
123 COMPAT_INTEL_PANTHERPOINT_AHCI, /* Intel Pantherpoint AHCI */
124 COMPAT_INTEL_MODEL_206AX, /* Intel Model 206AX CPU */
125 COMPAT_INTEL_GMA, /* Intel Graphics Media Accelerator */
126 COMPAT_AMS_AS3722, /* AMS AS3722 PMIC */
131 /* GPIOs are numbered from 0 */
133 FDT_GPIO_NONE = -1U, /* an invalid GPIO used to end our list */
135 FDT_GPIO_ACTIVE_LOW = 1 << 0, /* input is active low (else high) */
138 /* This is the state of a GPIO pin as defined by the fdt */
139 struct fdt_gpio_state {
140 const char *name; /* name of the fdt property defining this */
141 uint gpio; /* GPIO number, or FDT_GPIO_NONE if none */
142 u8 flags; /* FDT_GPIO_... flags */
145 /* This tells us whether a fdt_gpio_state record is valid or not */
146 #define fdt_gpio_isvalid(x) ((x)->gpio != FDT_GPIO_NONE)
149 * Read the GPIO taking into account the polarity of the pin.
151 * @param gpio pointer to the decoded gpio
152 * @return value of the gpio if successful, < 0 if unsuccessful
154 int fdtdec_get_gpio(struct fdt_gpio_state *gpio);
157 * Write the GPIO taking into account the polarity of the pin.
159 * @param gpio pointer to the decoded gpio
160 * @return 0 if successful
162 int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val);
165 * Find the next numbered alias for a peripheral. This is used to enumerate
166 * all the peripherals of a certain type.
168 * Do the first call with *upto = 0. Assuming /aliases/<name>0 exists then
169 * this function will return a pointer to the node the alias points to, and
170 * then update *upto to 1. Next time you call this function, the next node
173 * All nodes returned will match the compatible ID, as it is assumed that
174 * all peripherals use the same driver.
176 * @param blob FDT blob to use
177 * @param name Root name of alias to search for
178 * @param id Compatible ID to look for
179 * @return offset of next compatible node, or -FDT_ERR_NOTFOUND if no more
181 int fdtdec_next_alias(const void *blob, const char *name,
182 enum fdt_compat_id id, int *upto);
185 * Find the compatible ID for a given node.
187 * Generally each node has at least one compatible string attached to it.
188 * This function looks through our list of known compatible strings and
189 * returns the corresponding ID which matches the compatible string.
191 * @param blob FDT blob to use
192 * @param node Node containing compatible string to find
193 * @return compatible ID, or COMPAT_UNKNOWN if we cannot find a match
195 enum fdt_compat_id fdtdec_lookup(const void *blob, int node);
198 * Find the next compatible node for a peripheral.
200 * Do the first call with node = 0. This function will return a pointer to
201 * the next compatible node. Next time you call this function, pass the
202 * value returned, and the next node will be provided.
204 * @param blob FDT blob to use
205 * @param node Start node for search
206 * @param id Compatible ID to look for (enum fdt_compat_id)
207 * @return offset of next compatible node, or -FDT_ERR_NOTFOUND if no more
209 int fdtdec_next_compatible(const void *blob, int node,
210 enum fdt_compat_id id);
213 * Find the next compatible subnode for a peripheral.
215 * Do the first call with node set to the parent and depth = 0. This
216 * function will return the offset of the next compatible node. Next time
217 * you call this function, pass the node value returned last time, with
218 * depth unchanged, and the next node will be provided.
220 * @param blob FDT blob to use
221 * @param node Start node for search
222 * @param id Compatible ID to look for (enum fdt_compat_id)
223 * @param depthp Current depth (set to 0 before first call)
224 * @return offset of next compatible node, or -FDT_ERR_NOTFOUND if no more
226 int fdtdec_next_compatible_subnode(const void *blob, int node,
227 enum fdt_compat_id id, int *depthp);
230 * Look up an address property in a node and return it as an address.
231 * The property must hold either one address with no trailing data or
232 * one address with a length. This is only tested on 32-bit machines.
234 * @param blob FDT blob
235 * @param node node to examine
236 * @param prop_name name of property to find
237 * @return address, if found, or FDT_ADDR_T_NONE if not
239 fdt_addr_t fdtdec_get_addr(const void *blob, int node,
240 const char *prop_name);
243 * Look up an address property in a node and return it as an address.
244 * The property must hold one address with a length. This is only tested
245 * on 32-bit machines.
247 * @param blob FDT blob
248 * @param node node to examine
249 * @param prop_name name of property to find
250 * @return address, if found, or FDT_ADDR_T_NONE if not
252 fdt_addr_t fdtdec_get_addr_size(const void *blob, int node,
253 const char *prop_name, fdt_size_t *sizep);
256 * Look up a 32-bit integer property in a node and return it. The property
257 * must have at least 4 bytes of data. The value of the first cell is
260 * @param blob FDT blob
261 * @param node node to examine
262 * @param prop_name name of property to find
263 * @param default_val default value to return if the property is not found
264 * @return integer value, if found, or default_val if not
266 s32 fdtdec_get_int(const void *blob, int node, const char *prop_name,
270 * Look up a 64-bit integer property in a node and return it. The property
271 * must have at least 8 bytes of data (2 cells). The first two cells are
272 * concatenated to form a 8 bytes value, where the first cell is top half and
273 * the second cell is bottom half.
275 * @param blob FDT blob
276 * @param node node to examine
277 * @param prop_name name of property to find
278 * @param default_val default value to return if the property is not found
279 * @return integer value, if found, or default_val if not
281 uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
282 uint64_t default_val);
285 * Checks whether a node is enabled.
286 * This looks for a 'status' property. If this exists, then returns 1 if
287 * the status is 'ok' and 0 otherwise. If there is no status property,
288 * it returns 1 on the assumption that anything mentioned should be enabled
291 * @param blob FDT blob
292 * @param node node to examine
293 * @return integer value 0 (not enabled) or 1 (enabled)
295 int fdtdec_get_is_enabled(const void *blob, int node);
298 * Make sure we have a valid fdt available to control U-Boot.
300 * If not, a message is printed to the console if the console is ready.
302 * @return 0 if all ok, -1 if not
304 int fdtdec_prepare_fdt(void);
307 * Checks that we have a valid fdt available to control U-Boot.
309 * However, if not then for the moment nothing is done, since this function
310 * is called too early to panic().
314 int fdtdec_check_fdt(void);
317 * Find the nodes for a peripheral and return a list of them in the correct
318 * order. This is used to enumerate all the peripherals of a certain type.
320 * To use this, optionally set up a /aliases node with alias properties for
321 * a peripheral. For example, for usb you could have:
324 * usb0 = "/ehci@c5008000";
325 * usb1 = "/ehci@c5000000";
328 * Pass "usb" as the name to this function and will return a list of two
329 * nodes offsets: /ehci@c5008000 and ehci@c5000000.
331 * All nodes returned will match the compatible ID, as it is assumed that
332 * all peripherals use the same driver.
334 * If no alias node is found, then the node list will be returned in the
335 * order found in the fdt. If the aliases mention a node which doesn't
336 * exist, then this will be ignored. If nodes are found with no aliases,
337 * they will be added in any order.
339 * If there is a gap in the aliases, then this function return a 0 node at
340 * that position. The return value will also count these gaps.
342 * This function checks node properties and will not return nodes which are
343 * marked disabled (status = "disabled").
345 * @param blob FDT blob to use
346 * @param name Root name of alias to search for
347 * @param id Compatible ID to look for
348 * @param node_list Place to put list of found nodes
349 * @param maxcount Maximum number of nodes to find
350 * @return number of nodes found on success, FTD_ERR_... on error
352 int fdtdec_find_aliases_for_id(const void *blob, const char *name,
353 enum fdt_compat_id id, int *node_list, int maxcount);
356 * This function is similar to fdtdec_find_aliases_for_id() except that it
357 * adds to the node_list that is passed in. Any 0 elements are considered
358 * available for allocation - others are considered already used and are
361 * You can use this by calling fdtdec_find_aliases_for_id() with an
362 * uninitialised array, then setting the elements that are returned to -1,
363 * say, then calling this function, perhaps with a different compat id.
364 * Any elements you get back that are >0 are new nodes added by the call
367 * Note that if you have some nodes with aliases and some without, you are
368 * sailing close to the wind. The call to fdtdec_find_aliases_for_id() with
369 * one compat_id may fill in positions for which you have aliases defined
370 * for another compat_id. When you later call *this* function with the second
371 * compat_id, the alias positions may already be used. A debug warning may
372 * be generated in this case, but it is safest to define aliases for all
373 * nodes when you care about the ordering.
375 int fdtdec_add_aliases_for_id(const void *blob, const char *name,
376 enum fdt_compat_id id, int *node_list, int maxcount);
379 * Get the alias sequence number of a node
381 * This works out whether a node is pointed to by an alias, and if so, the
382 * sequence number of that alias. Aliases are of the form <base><num> where
383 * <num> is the sequence number. For example spi2 would be sequence number
386 * @param blob Device tree blob (if NULL, then error is returned)
387 * @param base Base name for alias (before the underscore)
388 * @param node Node to look up
389 * @param seqp This is set to the sequence number if one is found,
390 * but otherwise the value is left alone
391 * @return 0 if a sequence was found, -ve if not
393 int fdtdec_get_alias_seq(const void *blob, const char *base, int node,
397 * Get the offset of the given chosen node
399 * This looks up a property in /chosen containing the path to another node,
400 * then finds the offset of that node.
402 * @param blob Device tree blob (if NULL, then error is returned)
403 * @param name Property name, e.g. "stdout-path"
404 * @return Node offset referred to by that chosen node, or -ve FDT_ERR_...
406 int fdtdec_get_chosen_node(const void *blob, const char *name);
409 * Get the name for a compatible ID
411 * @param id Compatible ID to look for
412 * @return compatible string for that id
414 const char *fdtdec_get_compatible(enum fdt_compat_id id);
416 /* Look up a phandle and follow it to its node. Then return the offset
419 * @param blob FDT blob
420 * @param node node to examine
421 * @param prop_name name of property to find
422 * @return node offset if found, -ve error code on error
424 int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name);
427 * Look up a property in a node and return its contents in an integer
428 * array of given length. The property must have at least enough data for
429 * the array (4*count bytes). It may have more, but this will be ignored.
431 * @param blob FDT blob
432 * @param node node to examine
433 * @param prop_name name of property to find
434 * @param array array to fill with data
435 * @param count number of array elements
436 * @return 0 if ok, or -FDT_ERR_NOTFOUND if the property is not found,
437 * or -FDT_ERR_BADLAYOUT if not enough data
439 int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
440 u32 *array, int count);
443 * Look up a property in a node and return its contents in an integer
444 * array of given length. The property must exist but may have less data that
445 * expected (4*count bytes). It may have more, but this will be ignored.
447 * @param blob FDT blob
448 * @param node node to examine
449 * @param prop_name name of property to find
450 * @param array array to fill with data
451 * @param count number of array elements
452 * @return number of array elements if ok, or -FDT_ERR_NOTFOUND if the
453 * property is not found
455 int fdtdec_get_int_array_count(const void *blob, int node,
456 const char *prop_name, u32 *array, int count);
459 * Look up a property in a node and return a pointer to its contents as a
460 * unsigned int array of given length. The property must have at least enough
461 * data for the array ('count' cells). It may have more, but this will be
462 * ignored. The data is not copied.
464 * Note that you must access elements of the array with fdt32_to_cpu(),
465 * since the elements will be big endian even on a little endian machine.
467 * @param blob FDT blob
468 * @param node node to examine
469 * @param prop_name name of property to find
470 * @param count number of array elements
471 * @return pointer to array if found, or NULL if the property is not
472 * found or there is not enough data
474 const u32 *fdtdec_locate_array(const void *blob, int node,
475 const char *prop_name, int count);
478 * Look up a boolean property in a node and return it.
480 * A boolean properly is true if present in the device tree and false if not
481 * present, regardless of its value.
483 * @param blob FDT blob
484 * @param node node to examine
485 * @param prop_name name of property to find
486 * @return 1 if the properly is present; 0 if it isn't present
488 int fdtdec_get_bool(const void *blob, int node, const char *prop_name);
491 * Decode a single GPIOs from an FDT.
493 * If the property is not found, then the GPIO structure will still be
494 * initialised, with gpio set to FDT_GPIO_NONE. This makes it easy to
495 * provide optional GPIOs.
497 * @param blob FDT blob to use
498 * @param node Node to look at
499 * @param prop_name Node property name
500 * @param gpio gpio elements to fill from FDT
501 * @return 0 if ok, -FDT_ERR_NOTFOUND if the property is missing.
503 int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name,
504 struct fdt_gpio_state *gpio);
507 * Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no
510 * @param blob FDT blob to use
511 * @param node Node to look at
512 * @param prop_name Node property name
513 * @param gpio Array of gpio elements to fill from FDT. This will be
514 * untouched if either 0 or an error is returned
515 * @param max_count Maximum number of elements allowed
516 * @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would
517 * be exceeded, or -FDT_ERR_NOTFOUND if the property is missing.
519 int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name,
520 struct fdt_gpio_state *gpio, int max_count);
523 * Set up a GPIO pin according to the provided gpio information. At present this
524 * just requests the GPIO.
526 * If the gpio is FDT_GPIO_NONE, no action is taken. This makes it easy to
527 * deal with optional GPIOs.
529 * @param gpio GPIO info to use for set up
530 * @return 0 if all ok or gpio was FDT_GPIO_NONE; -1 on error
532 int fdtdec_setup_gpio(struct fdt_gpio_state *gpio);
535 * Look in the FDT for a config item with the given name and return its value
536 * as a 32-bit integer. The property must have at least 4 bytes of data. The
537 * value of the first cell is returned.
539 * @param blob FDT blob to use
540 * @param prop_name Node property name
541 * @param default_val default value to return if the property is not found
542 * @return integer value, if found, or default_val if not
544 int fdtdec_get_config_int(const void *blob, const char *prop_name,
548 * Look in the FDT for a config item with the given name
549 * and return whether it exists.
551 * @param blob FDT blob
552 * @param prop_name property name to look up
553 * @return 1, if it exists, or 0 if not
555 int fdtdec_get_config_bool(const void *blob, const char *prop_name);
558 * Look in the FDT for a config item with the given name and return its value
561 * @param blob FDT blob
562 * @param prop_name property name to look up
563 * @returns property string, NULL on error.
565 char *fdtdec_get_config_string(const void *blob, const char *prop_name);
568 * Look up a property in a node and return its contents in a byte
569 * array of given length. The property must have at least enough data for
570 * the array (count bytes). It may have more, but this will be ignored.
572 * @param blob FDT blob
573 * @param node node to examine
574 * @param prop_name name of property to find
575 * @param array array to fill with data
576 * @param count number of array elements
577 * @return 0 if ok, or -FDT_ERR_MISSING if the property is not found,
578 * or -FDT_ERR_BADLAYOUT if not enough data
580 int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
581 u8 *array, int count);
584 * Look up a property in a node and return a pointer to its contents as a
585 * byte array of given length. The property must have at least enough data
586 * for the array (count bytes). It may have more, but this will be ignored.
587 * The data is not copied.
589 * @param blob FDT blob
590 * @param node node to examine
591 * @param prop_name name of property to find
592 * @param count number of array elements
593 * @return pointer to byte array if found, or NULL if the property is not
594 * found or there is not enough data
596 const u8 *fdtdec_locate_byte_array(const void *blob, int node,
597 const char *prop_name, int count);
600 * Look up a property in a node which contains a memory region address and
601 * size. Then return a pointer to this address.
603 * The property must hold one address with a length. This is only tested on
606 * @param blob FDT blob
607 * @param node node to examine
608 * @param prop_name name of property to find
609 * @param basep Returns base address of region
610 * @param size Returns size of region
611 * @return 0 if ok, -1 on error (property not found)
613 int fdtdec_decode_region(const void *blob, int node, const char *prop_name,
614 fdt_addr_t *basep, fdt_size_t *sizep);
616 enum fmap_compress_t {
627 /* A flash map entry, containing an offset and length */
631 uint32_t used; /* Number of bytes used in region */
632 enum fmap_compress_t compress_algo; /* Compression type */
633 enum fmap_hash_t hash_algo; /* Hash algorithm */
634 const uint8_t *hash; /* Hash value */
635 int hash_size; /* Hash size */
639 * Read a flash entry from the fdt
641 * @param blob FDT blob
642 * @param node Offset of node to read
643 * @param name Name of node being read
644 * @param entry Place to put offset and size of this node
645 * @return 0 if ok, -ve on error
647 int fdtdec_read_fmap_entry(const void *blob, int node, const char *name,
648 struct fmap_entry *entry);
651 * Obtain an indexed resource from a device property.
653 * @param fdt FDT blob
654 * @param node node to examine
655 * @param property name of the property to parse
656 * @param index index of the resource to retrieve
657 * @param res returns the resource
658 * @return 0 if ok, negative on error
660 int fdt_get_resource(const void *fdt, int node, const char *property,
661 unsigned int index, struct fdt_resource *res);
664 * Obtain a named resource from a device property.
666 * Look up the index of the name in a list of strings and return the resource
669 * @param fdt FDT blob
670 * @param node node to examine
671 * @param property name of the property to parse
672 * @param prop_names name of the property containing the list of names
673 * @param name the name of the entry to look up
674 * @param res returns the resource
676 int fdt_get_named_resource(const void *fdt, int node, const char *property,
677 const char *prop_names, const char *name,
678 struct fdt_resource *res);
681 * Look at the reg property of a device node that represents a PCI device
682 * and parse the bus, device and function number from it.
684 * @param fdt FDT blob
685 * @param node node to examine
686 * @param bdf returns bus, device, function triplet
687 * @return 0 if ok, negative on error
689 int fdtdec_pci_get_bdf(const void *fdt, int node, int *bdf);
692 * Decode a named region within a memory bank of a given type.
694 * This function handles selection of a memory region. The region is
695 * specified as an offset/size within a particular type of memory.
697 * The properties used are:
699 * <mem_type>-memory<suffix> for the name of the memory bank
700 * <mem_type>-offset<suffix> for the offset in that bank
702 * The property value must have an offset and a size. The function checks
703 * that the region is entirely within the memory bank.5
705 * @param blob FDT blob
706 * @param node Node containing the properties (-1 for /config)
707 * @param mem_type Type of memory to use, which is a name, such as
708 * "u-boot" or "kernel".
709 * @param suffix String to append to the memory/offset
711 * @param basep Returns base of region
712 * @param sizep Returns size of region
713 * @return 0 if OK, -ive on error
715 int fdtdec_decode_memory_region(const void *blob, int node,
716 const char *mem_type, const char *suffix,
717 fdt_addr_t *basep, fdt_size_t *sizep);