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 */
130 /* GPIOs are numbered from 0 */
132 FDT_GPIO_NONE = -1U, /* an invalid GPIO used to end our list */
134 FDT_GPIO_ACTIVE_LOW = 1 << 0, /* input is active low (else high) */
137 /* This is the state of a GPIO pin as defined by the fdt */
138 struct fdt_gpio_state {
139 const char *name; /* name of the fdt property defining this */
140 uint gpio; /* GPIO number, or FDT_GPIO_NONE if none */
141 u8 flags; /* FDT_GPIO_... flags */
144 /* This tells us whether a fdt_gpio_state record is valid or not */
145 #define fdt_gpio_isvalid(x) ((x)->gpio != FDT_GPIO_NONE)
148 * Read the GPIO taking into account the polarity of the pin.
150 * @param gpio pointer to the decoded gpio
151 * @return value of the gpio if successful, < 0 if unsuccessful
153 int fdtdec_get_gpio(struct fdt_gpio_state *gpio);
156 * Write the GPIO taking into account the polarity of the pin.
158 * @param gpio pointer to the decoded gpio
159 * @return 0 if successful
161 int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val);
164 * Find the next numbered alias for a peripheral. This is used to enumerate
165 * all the peripherals of a certain type.
167 * Do the first call with *upto = 0. Assuming /aliases/<name>0 exists then
168 * this function will return a pointer to the node the alias points to, and
169 * then update *upto to 1. Next time you call this function, the next node
172 * All nodes returned will match the compatible ID, as it is assumed that
173 * all peripherals use the same driver.
175 * @param blob FDT blob to use
176 * @param name Root name of alias to search for
177 * @param id Compatible ID to look for
178 * @return offset of next compatible node, or -FDT_ERR_NOTFOUND if no more
180 int fdtdec_next_alias(const void *blob, const char *name,
181 enum fdt_compat_id id, int *upto);
184 * Find the compatible ID for a given node.
186 * Generally each node has at least one compatible string attached to it.
187 * This function looks through our list of known compatible strings and
188 * returns the corresponding ID which matches the compatible string.
190 * @param blob FDT blob to use
191 * @param node Node containing compatible string to find
192 * @return compatible ID, or COMPAT_UNKNOWN if we cannot find a match
194 enum fdt_compat_id fdtdec_lookup(const void *blob, int node);
197 * Find the next compatible node for a peripheral.
199 * Do the first call with node = 0. This function will return a pointer to
200 * the next compatible node. Next time you call this function, pass the
201 * value returned, and the next node will be provided.
203 * @param blob FDT blob to use
204 * @param node Start node for search
205 * @param id Compatible ID to look for (enum fdt_compat_id)
206 * @return offset of next compatible node, or -FDT_ERR_NOTFOUND if no more
208 int fdtdec_next_compatible(const void *blob, int node,
209 enum fdt_compat_id id);
212 * Find the next compatible subnode for a peripheral.
214 * Do the first call with node set to the parent and depth = 0. This
215 * function will return the offset of the next compatible node. Next time
216 * you call this function, pass the node value returned last time, with
217 * depth unchanged, and the next node will be provided.
219 * @param blob FDT blob to use
220 * @param node Start node for search
221 * @param id Compatible ID to look for (enum fdt_compat_id)
222 * @param depthp Current depth (set to 0 before first call)
223 * @return offset of next compatible node, or -FDT_ERR_NOTFOUND if no more
225 int fdtdec_next_compatible_subnode(const void *blob, int node,
226 enum fdt_compat_id id, int *depthp);
229 * Look up an address property in a node and return it as an address.
230 * The property must hold either one address with no trailing data or
231 * one address with a length. This is only tested on 32-bit machines.
233 * @param blob FDT blob
234 * @param node node to examine
235 * @param prop_name name of property to find
236 * @return address, if found, or FDT_ADDR_T_NONE if not
238 fdt_addr_t fdtdec_get_addr(const void *blob, int node,
239 const char *prop_name);
242 * Look up an address property in a node and return it as an address.
243 * The property must hold one address with a length. This is only tested
244 * on 32-bit machines.
246 * @param blob FDT blob
247 * @param node node to examine
248 * @param prop_name name of property to find
249 * @return address, if found, or FDT_ADDR_T_NONE if not
251 fdt_addr_t fdtdec_get_addr_size(const void *blob, int node,
252 const char *prop_name, fdt_size_t *sizep);
255 * Look up a 32-bit integer property in a node and return it. The property
256 * must have at least 4 bytes of data. The value of the first cell is
259 * @param blob FDT blob
260 * @param node node to examine
261 * @param prop_name name of property to find
262 * @param default_val default value to return if the property is not found
263 * @return integer value, if found, or default_val if not
265 s32 fdtdec_get_int(const void *blob, int node, const char *prop_name,
269 * Look up a 64-bit integer property in a node and return it. The property
270 * must have at least 8 bytes of data (2 cells). The first two cells are
271 * concatenated to form a 8 bytes value, where the first cell is top half and
272 * the second cell is bottom half.
274 * @param blob FDT blob
275 * @param node node to examine
276 * @param prop_name name of property to find
277 * @param default_val default value to return if the property is not found
278 * @return integer value, if found, or default_val if not
280 uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
281 uint64_t default_val);
284 * Checks whether a node is enabled.
285 * This looks for a 'status' property. If this exists, then returns 1 if
286 * the status is 'ok' and 0 otherwise. If there is no status property,
287 * it returns 1 on the assumption that anything mentioned should be enabled
290 * @param blob FDT blob
291 * @param node node to examine
292 * @return integer value 0 (not enabled) or 1 (enabled)
294 int fdtdec_get_is_enabled(const void *blob, int node);
297 * Make sure we have a valid fdt available to control U-Boot.
299 * If not, a message is printed to the console if the console is ready.
301 * @return 0 if all ok, -1 if not
303 int fdtdec_prepare_fdt(void);
306 * Checks that we have a valid fdt available to control U-Boot.
308 * However, if not then for the moment nothing is done, since this function
309 * is called too early to panic().
313 int fdtdec_check_fdt(void);
316 * Find the nodes for a peripheral and return a list of them in the correct
317 * order. This is used to enumerate all the peripherals of a certain type.
319 * To use this, optionally set up a /aliases node with alias properties for
320 * a peripheral. For example, for usb you could have:
323 * usb0 = "/ehci@c5008000";
324 * usb1 = "/ehci@c5000000";
327 * Pass "usb" as the name to this function and will return a list of two
328 * nodes offsets: /ehci@c5008000 and ehci@c5000000.
330 * All nodes returned will match the compatible ID, as it is assumed that
331 * all peripherals use the same driver.
333 * If no alias node is found, then the node list will be returned in the
334 * order found in the fdt. If the aliases mention a node which doesn't
335 * exist, then this will be ignored. If nodes are found with no aliases,
336 * they will be added in any order.
338 * If there is a gap in the aliases, then this function return a 0 node at
339 * that position. The return value will also count these gaps.
341 * This function checks node properties and will not return nodes which are
342 * marked disabled (status = "disabled").
344 * @param blob FDT blob to use
345 * @param name Root name of alias to search for
346 * @param id Compatible ID to look for
347 * @param node_list Place to put list of found nodes
348 * @param maxcount Maximum number of nodes to find
349 * @return number of nodes found on success, FTD_ERR_... on error
351 int fdtdec_find_aliases_for_id(const void *blob, const char *name,
352 enum fdt_compat_id id, int *node_list, int maxcount);
355 * This function is similar to fdtdec_find_aliases_for_id() except that it
356 * adds to the node_list that is passed in. Any 0 elements are considered
357 * available for allocation - others are considered already used and are
360 * You can use this by calling fdtdec_find_aliases_for_id() with an
361 * uninitialised array, then setting the elements that are returned to -1,
362 * say, then calling this function, perhaps with a different compat id.
363 * Any elements you get back that are >0 are new nodes added by the call
366 * Note that if you have some nodes with aliases and some without, you are
367 * sailing close to the wind. The call to fdtdec_find_aliases_for_id() with
368 * one compat_id may fill in positions for which you have aliases defined
369 * for another compat_id. When you later call *this* function with the second
370 * compat_id, the alias positions may already be used. A debug warning may
371 * be generated in this case, but it is safest to define aliases for all
372 * nodes when you care about the ordering.
374 int fdtdec_add_aliases_for_id(const void *blob, const char *name,
375 enum fdt_compat_id id, int *node_list, int maxcount);
378 * Get the alias sequence number of a node
380 * This works out whether a node is pointed to by an alias, and if so, the
381 * sequence number of that alias. Aliases are of the form <base><num> where
382 * <num> is the sequence number. For example spi2 would be sequence number
385 * @param blob Device tree blob (if NULL, then error is returned)
386 * @param base Base name for alias (before the underscore)
387 * @param node Node to look up
388 * @param seqp This is set to the sequence number if one is found,
389 * but otherwise the value is left alone
390 * @return 0 if a sequence was found, -ve if not
392 int fdtdec_get_alias_seq(const void *blob, const char *base, int node,
396 * Get the offset of the given chosen node
398 * This looks up a property in /chosen containing the path to another node,
399 * then finds the offset of that node.
401 * @param blob Device tree blob (if NULL, then error is returned)
402 * @param name Property name, e.g. "stdout-path"
403 * @return Node offset referred to by that chosen node, or -ve FDT_ERR_...
405 int fdtdec_get_chosen_node(const void *blob, const char *name);
408 * Get the name for a compatible ID
410 * @param id Compatible ID to look for
411 * @return compatible string for that id
413 const char *fdtdec_get_compatible(enum fdt_compat_id id);
415 /* Look up a phandle and follow it to its node. Then return the offset
418 * @param blob FDT blob
419 * @param node node to examine
420 * @param prop_name name of property to find
421 * @return node offset if found, -ve error code on error
423 int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name);
426 * Look up a property in a node and return its contents in an integer
427 * array of given length. The property must have at least enough data for
428 * the array (4*count bytes). It may have more, but this will be ignored.
430 * @param blob FDT blob
431 * @param node node to examine
432 * @param prop_name name of property to find
433 * @param array array to fill with data
434 * @param count number of array elements
435 * @return 0 if ok, or -FDT_ERR_NOTFOUND if the property is not found,
436 * or -FDT_ERR_BADLAYOUT if not enough data
438 int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
439 u32 *array, int count);
442 * Look up a property in a node and return its contents in an integer
443 * array of given length. The property must exist but may have less data that
444 * expected (4*count bytes). It may have more, but this will be ignored.
446 * @param blob FDT blob
447 * @param node node to examine
448 * @param prop_name name of property to find
449 * @param array array to fill with data
450 * @param count number of array elements
451 * @return number of array elements if ok, or -FDT_ERR_NOTFOUND if the
452 * property is not found
454 int fdtdec_get_int_array_count(const void *blob, int node,
455 const char *prop_name, u32 *array, int count);
458 * Look up a property in a node and return a pointer to its contents as a
459 * unsigned int array of given length. The property must have at least enough
460 * data for the array ('count' cells). It may have more, but this will be
461 * ignored. The data is not copied.
463 * Note that you must access elements of the array with fdt32_to_cpu(),
464 * since the elements will be big endian even on a little endian machine.
466 * @param blob FDT blob
467 * @param node node to examine
468 * @param prop_name name of property to find
469 * @param count number of array elements
470 * @return pointer to array if found, or NULL if the property is not
471 * found or there is not enough data
473 const u32 *fdtdec_locate_array(const void *blob, int node,
474 const char *prop_name, int count);
477 * Look up a boolean property in a node and return it.
479 * A boolean properly is true if present in the device tree and false if not
480 * present, regardless of its value.
482 * @param blob FDT blob
483 * @param node node to examine
484 * @param prop_name name of property to find
485 * @return 1 if the properly is present; 0 if it isn't present
487 int fdtdec_get_bool(const void *blob, int node, const char *prop_name);
490 * Decode a single GPIOs from an FDT.
492 * If the property is not found, then the GPIO structure will still be
493 * initialised, with gpio set to FDT_GPIO_NONE. This makes it easy to
494 * provide optional GPIOs.
496 * @param blob FDT blob to use
497 * @param node Node to look at
498 * @param prop_name Node property name
499 * @param gpio gpio elements to fill from FDT
500 * @return 0 if ok, -FDT_ERR_NOTFOUND if the property is missing.
502 int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name,
503 struct fdt_gpio_state *gpio);
506 * Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no
509 * @param blob FDT blob to use
510 * @param node Node to look at
511 * @param prop_name Node property name
512 * @param gpio Array of gpio elements to fill from FDT. This will be
513 * untouched if either 0 or an error is returned
514 * @param max_count Maximum number of elements allowed
515 * @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would
516 * be exceeded, or -FDT_ERR_NOTFOUND if the property is missing.
518 int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name,
519 struct fdt_gpio_state *gpio, int max_count);
522 * Set up a GPIO pin according to the provided gpio information. At present this
523 * just requests the GPIO.
525 * If the gpio is FDT_GPIO_NONE, no action is taken. This makes it easy to
526 * deal with optional GPIOs.
528 * @param gpio GPIO info to use for set up
529 * @return 0 if all ok or gpio was FDT_GPIO_NONE; -1 on error
531 int fdtdec_setup_gpio(struct fdt_gpio_state *gpio);
534 * Look in the FDT for a config item with the given name and return its value
535 * as a 32-bit integer. The property must have at least 4 bytes of data. The
536 * value of the first cell is returned.
538 * @param blob FDT blob to use
539 * @param prop_name Node property name
540 * @param default_val default value to return if the property is not found
541 * @return integer value, if found, or default_val if not
543 int fdtdec_get_config_int(const void *blob, const char *prop_name,
547 * Look in the FDT for a config item with the given name
548 * and return whether it exists.
550 * @param blob FDT blob
551 * @param prop_name property name to look up
552 * @return 1, if it exists, or 0 if not
554 int fdtdec_get_config_bool(const void *blob, const char *prop_name);
557 * Look in the FDT for a config item with the given name and return its value
560 * @param blob FDT blob
561 * @param prop_name property name to look up
562 * @returns property string, NULL on error.
564 char *fdtdec_get_config_string(const void *blob, const char *prop_name);
567 * Look up a property in a node and return its contents in a byte
568 * array of given length. The property must have at least enough data for
569 * the array (count bytes). It may have more, but this will be ignored.
571 * @param blob FDT blob
572 * @param node node to examine
573 * @param prop_name name of property to find
574 * @param array array to fill with data
575 * @param count number of array elements
576 * @return 0 if ok, or -FDT_ERR_MISSING if the property is not found,
577 * or -FDT_ERR_BADLAYOUT if not enough data
579 int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
580 u8 *array, int count);
583 * Look up a property in a node and return a pointer to its contents as a
584 * byte array of given length. The property must have at least enough data
585 * for the array (count bytes). It may have more, but this will be ignored.
586 * The data is not copied.
588 * @param blob FDT blob
589 * @param node node to examine
590 * @param prop_name name of property to find
591 * @param count number of array elements
592 * @return pointer to byte array if found, or NULL if the property is not
593 * found or there is not enough data
595 const u8 *fdtdec_locate_byte_array(const void *blob, int node,
596 const char *prop_name, int count);
599 * Look up a property in a node which contains a memory region address and
600 * size. Then return a pointer to this address.
602 * The property must hold one address with a length. This is only tested on
605 * @param blob FDT blob
606 * @param node node to examine
607 * @param prop_name name of property to find
608 * @param basep Returns base address of region
609 * @param size Returns size of region
610 * @return 0 if ok, -1 on error (property not found)
612 int fdtdec_decode_region(const void *blob, int node, const char *prop_name,
613 fdt_addr_t *basep, fdt_size_t *sizep);
615 enum fmap_compress_t {
626 /* A flash map entry, containing an offset and length */
630 uint32_t used; /* Number of bytes used in region */
631 enum fmap_compress_t compress_algo; /* Compression type */
632 enum fmap_hash_t hash_algo; /* Hash algorithm */
633 const uint8_t *hash; /* Hash value */
634 int hash_size; /* Hash size */
638 * Read a flash entry from the fdt
640 * @param blob FDT blob
641 * @param node Offset of node to read
642 * @param name Name of node being read
643 * @param entry Place to put offset and size of this node
644 * @return 0 if ok, -ve on error
646 int fdtdec_read_fmap_entry(const void *blob, int node, const char *name,
647 struct fmap_entry *entry);
650 * Obtain an indexed resource from a device property.
652 * @param fdt FDT blob
653 * @param node node to examine
654 * @param property name of the property to parse
655 * @param index index of the resource to retrieve
656 * @param res returns the resource
657 * @return 0 if ok, negative on error
659 int fdt_get_resource(const void *fdt, int node, const char *property,
660 unsigned int index, struct fdt_resource *res);
663 * Obtain a named resource from a device property.
665 * Look up the index of the name in a list of strings and return the resource
668 * @param fdt FDT blob
669 * @param node node to examine
670 * @param property name of the property to parse
671 * @param prop_names name of the property containing the list of names
672 * @param name the name of the entry to look up
673 * @param res returns the resource
675 int fdt_get_named_resource(const void *fdt, int node, const char *property,
676 const char *prop_names, const char *name,
677 struct fdt_resource *res);
680 * Look at the reg property of a device node that represents a PCI device
681 * and parse the bus, device and function number from it.
683 * @param fdt FDT blob
684 * @param node node to examine
685 * @param bdf returns bus, device, function triplet
686 * @return 0 if ok, negative on error
688 int fdtdec_pci_get_bdf(const void *fdt, int node, int *bdf);
691 * Decode a named region within a memory bank of a given type.
693 * This function handles selection of a memory region. The region is
694 * specified as an offset/size within a particular type of memory.
696 * The properties used are:
698 * <mem_type>-memory<suffix> for the name of the memory bank
699 * <mem_type>-offset<suffix> for the offset in that bank
701 * The property value must have an offset and a size. The function checks
702 * that the region is entirely within the memory bank.5
704 * @param blob FDT blob
705 * @param node Node containing the properties (-1 for /config)
706 * @param mem_type Type of memory to use, which is a name, such as
707 * "u-boot" or "kernel".
708 * @param suffix String to append to the memory/offset
710 * @param basep Returns base of region
711 * @param sizep Returns size of region
712 * @return 0 if OK, -ive on error
714 int fdtdec_decode_memory_region(const void *blob, int node,
715 const char *mem_type, const char *suffix,
716 fdt_addr_t *basep, fdt_size_t *sizep);