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.
21 * A typedef for a physical address. Note that fdt data is always big
22 * endian even on a litle endian machine.
24 typedef phys_addr_t fdt_addr_t;
25 typedef phys_size_t fdt_size_t;
26 #ifdef CONFIG_PHYS_64BIT
27 #define FDT_ADDR_T_NONE (-1U)
28 #define fdt_addr_to_cpu(reg) be64_to_cpu(reg)
29 #define fdt_size_to_cpu(reg) be64_to_cpu(reg)
30 typedef fdt64_t fdt_val_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)
35 typedef fdt32_t fdt_val_t;
38 /* Information obtained about memory from the FDT */
44 #ifdef CONFIG_SPL_BUILD
51 * Information about a resource. start is the first address of the resource
52 * and end is the last address (inclusive). The length of the resource will
53 * be equal to: end - start + 1.
61 FDT_PCI_SPACE_CONFIG = 0,
62 FDT_PCI_SPACE_IO = 0x01000000,
63 FDT_PCI_SPACE_MEM32 = 0x02000000,
64 FDT_PCI_SPACE_MEM64 = 0x03000000,
65 FDT_PCI_SPACE_MEM32_PREF = 0x42000000,
66 FDT_PCI_SPACE_MEM64_PREF = 0x43000000,
69 #define FDT_PCI_ADDR_CELLS 3
70 #define FDT_PCI_SIZE_CELLS 2
71 #define FDT_PCI_REG_SIZE \
72 ((FDT_PCI_ADDR_CELLS + FDT_PCI_SIZE_CELLS) * sizeof(u32))
75 * The Open Firmware spec defines PCI physical address as follows:
77 * bits# 31 .... 24 23 .... 16 15 .... 08 07 .... 00
79 * phys.hi cell: npt000ss bbbbbbbb dddddfff rrrrrrrr
80 * phys.mid cell: hhhhhhhh hhhhhhhh hhhhhhhh hhhhhhhh
81 * phys.lo cell: llllllll llllllll llllllll llllllll
85 * n: is 0 if the address is relocatable, 1 otherwise
86 * p: is 1 if addressable region is prefetchable, 0 otherwise
87 * t: is 1 if the address is aliased (for non-relocatable I/O) below 1MB
88 * (for Memory), or below 64KB (for relocatable I/O)
89 * ss: is the space code, denoting the address space
90 * bbbbbbbb: is the 8-bit Bus Number
91 * ddddd: is the 5-bit Device Number
92 * fff: is the 3-bit Function Number
93 * rrrrrrrr: is the 8-bit Register Number
94 * hhhhhhhh: is a 32-bit unsigned number
95 * llllllll: is a 32-bit unsigned number
104 * Compute the size of a resource.
106 * @param res the resource to operate on
107 * @return the size of the resource
109 static inline fdt_size_t fdt_resource_size(const struct fdt_resource *res)
111 return res->end - res->start + 1;
115 * Compat types that we know about and for which we might have drivers.
116 * Each is named COMPAT_<dir>_<filename> where <dir> is the directory
121 COMPAT_NVIDIA_TEGRA20_EMC, /* Tegra20 memory controller */
122 COMPAT_NVIDIA_TEGRA20_EMC_TABLE, /* Tegra20 memory timing table */
123 COMPAT_NVIDIA_TEGRA20_NAND, /* Tegra2 NAND controller */
124 COMPAT_NVIDIA_TEGRA124_XUSB_PADCTL,
125 /* Tegra124 XUSB pad controller */
126 COMPAT_NVIDIA_TEGRA210_XUSB_PADCTL,
127 /* Tegra210 XUSB pad controller */
128 COMPAT_SMSC_LAN9215, /* SMSC 10/100 Ethernet LAN9215 */
129 COMPAT_SAMSUNG_EXYNOS5_SROMC, /* Exynos5 SROMC */
130 COMPAT_SAMSUNG_S3C2440_I2C, /* Exynos I2C Controller */
131 COMPAT_SAMSUNG_EXYNOS5_SOUND, /* Exynos Sound */
132 COMPAT_WOLFSON_WM8994_CODEC, /* Wolfson WM8994 Sound Codec */
133 COMPAT_SAMSUNG_EXYNOS_USB_PHY, /* Exynos phy controller for usb2.0 */
134 COMPAT_SAMSUNG_EXYNOS5_USB3_PHY,/* Exynos phy controller for usb3.0 */
135 COMPAT_SAMSUNG_EXYNOS_TMU, /* Exynos TMU */
136 COMPAT_SAMSUNG_EXYNOS_MIPI_DSI, /* Exynos mipi dsi */
137 COMPAT_SAMSUNG_EXYNOS_DWMMC, /* Exynos DWMMC controller */
138 COMPAT_SAMSUNG_EXYNOS_MMC, /* Exynos MMC controller */
139 COMPAT_MAXIM_MAX77686_PMIC, /* MAX77686 PMIC */
140 COMPAT_GENERIC_SPI_FLASH, /* Generic SPI Flash chip */
141 COMPAT_MAXIM_98095_CODEC, /* MAX98095 Codec */
142 COMPAT_SAMSUNG_EXYNOS5_I2C, /* Exynos5 High Speed I2C Controller */
143 COMPAT_SAMSUNG_EXYNOS_SYSMMU, /* Exynos sysmmu */
144 COMPAT_INTEL_MICROCODE, /* Intel microcode update */
145 COMPAT_AMS_AS3722, /* AMS AS3722 PMIC */
146 COMPAT_INTEL_QRK_MRC, /* Intel Quark MRC */
147 COMPAT_ALTERA_SOCFPGA_DWMAC, /* SoCFPGA Ethernet controller */
148 COMPAT_ALTERA_SOCFPGA_DWMMC, /* SoCFPGA DWMMC controller */
149 COMPAT_ALTERA_SOCFPGA_DWC2USB, /* SoCFPGA DWC2 USB controller */
150 COMPAT_INTEL_BAYTRAIL_FSP, /* Intel Bay Trail FSP */
151 COMPAT_INTEL_BAYTRAIL_FSP_MDP, /* Intel FSP memory-down params */
152 COMPAT_INTEL_IVYBRIDGE_FSP, /* Intel Ivy Bridge FSP */
153 COMPAT_SUNXI_NAND, /* SUNXI NAND controller */
154 COMPAT_ALTERA_SOCFPGA_CLK, /* SoCFPGA Clock initialization */
155 COMPAT_ALTERA_SOCFPGA_PINCTRL_SINGLE, /* SoCFPGA pinctrl-single */
156 COMPAT_ALTERA_SOCFPGA_H2F_BRG, /* SoCFPGA hps2fpga bridge */
157 COMPAT_ALTERA_SOCFPGA_LWH2F_BRG, /* SoCFPGA lwhps2fpga bridge */
158 COMPAT_ALTERA_SOCFPGA_F2H_BRG, /* SoCFPGA fpga2hps bridge */
159 COMPAT_ALTERA_SOCFPGA_F2SDR0, /* SoCFPGA fpga2SDRAM0 bridge */
160 COMPAT_ALTERA_SOCFPGA_F2SDR1, /* SoCFPGA fpga2SDRAM1 bridge */
161 COMPAT_ALTERA_SOCFPGA_F2SDR2, /* SoCFPGA fpga2SDRAM2 bridge */
162 COMPAT_ALTERA_SOCFPGA_FPGA0, /* SOCFPGA FPGA manager */
163 COMPAT_ALTERA_SOCFPGA_NOC, /* SOCFPGA Arria 10 NOC */
168 #define MAX_PHANDLE_ARGS 16
169 struct fdtdec_phandle_args {
172 uint32_t args[MAX_PHANDLE_ARGS];
176 * fdtdec_parse_phandle_with_args() - Find a node pointed by phandle in a list
178 * This function is useful to parse lists of phandles and their arguments.
191 * list = <&phandle1 1 2 &phandle2 3>;
194 * To get a device_node of the `node2' node you may call this:
195 * fdtdec_parse_phandle_with_args(blob, node3, "list", "#list-cells", 0, 1,
198 * (This function is a modified version of __of_parse_phandle_with_args() from
201 * @blob: Pointer to device tree
202 * @src_node: Offset of device tree node containing a list
203 * @list_name: property name that contains a list
204 * @cells_name: property name that specifies the phandles' arguments count,
205 * or NULL to use @cells_count
206 * @cells_count: Cell count to use if @cells_name is NULL
207 * @index: index of a phandle to parse out
208 * @out_args: optional pointer to output arguments structure (will be filled)
209 * @return 0 on success (with @out_args filled out if not NULL), -ENOENT if
210 * @list_name does not exist, a phandle was not found, @cells_name
211 * could not be found, the arguments were truncated or there were too
215 int fdtdec_parse_phandle_with_args(const void *blob, int src_node,
216 const char *list_name,
217 const char *cells_name,
218 int cell_count, int index,
219 struct fdtdec_phandle_args *out_args);
222 * Find the next numbered alias for a peripheral. This is used to enumerate
223 * all the peripherals of a certain type.
225 * Do the first call with *upto = 0. Assuming /aliases/<name>0 exists then
226 * this function will return a pointer to the node the alias points to, and
227 * then update *upto to 1. Next time you call this function, the next node
230 * All nodes returned will match the compatible ID, as it is assumed that
231 * all peripherals use the same driver.
233 * @param blob FDT blob to use
234 * @param name Root name of alias to search for
235 * @param id Compatible ID to look for
236 * @return offset of next compatible node, or -FDT_ERR_NOTFOUND if no more
238 int fdtdec_next_alias(const void *blob, const char *name,
239 enum fdt_compat_id id, int *upto);
242 * Find the compatible ID for a given node.
244 * Generally each node has at least one compatible string attached to it.
245 * This function looks through our list of known compatible strings and
246 * returns the corresponding ID which matches the compatible string.
248 * @param blob FDT blob to use
249 * @param node Node containing compatible string to find
250 * @return compatible ID, or COMPAT_UNKNOWN if we cannot find a match
252 enum fdt_compat_id fdtdec_lookup(const void *blob, int node);
255 * Find the next compatible node for a peripheral.
257 * Do the first call with node = 0. This function will return a pointer to
258 * the next compatible node. Next time you call this function, pass the
259 * value returned, and the next node will be provided.
261 * @param blob FDT blob to use
262 * @param node Start node for search
263 * @param id Compatible ID to look for (enum fdt_compat_id)
264 * @return offset of next compatible node, or -FDT_ERR_NOTFOUND if no more
266 int fdtdec_next_compatible(const void *blob, int node,
267 enum fdt_compat_id id);
270 * Find the next compatible subnode for a peripheral.
272 * Do the first call with node set to the parent and depth = 0. This
273 * function will return the offset of the next compatible node. Next time
274 * you call this function, pass the node value returned last time, with
275 * depth unchanged, and the next node will be provided.
277 * @param blob FDT blob to use
278 * @param node Start node for search
279 * @param id Compatible ID to look for (enum fdt_compat_id)
280 * @param depthp Current depth (set to 0 before first call)
281 * @return offset of next compatible node, or -FDT_ERR_NOTFOUND if no more
283 int fdtdec_next_compatible_subnode(const void *blob, int node,
284 enum fdt_compat_id id, int *depthp);
287 * Look up an address property in a node and return the parsed address, and
288 * optionally the parsed size.
290 * This variant assumes a known and fixed number of cells are used to
291 * represent the address and size.
293 * You probably don't want to use this function directly except to parse
294 * non-standard properties, and never to parse the "reg" property. Instead,
295 * use one of the "auto" variants below, which automatically honor the
296 * #address-cells and #size-cells properties in the parent node.
298 * @param blob FDT blob
299 * @param node node to examine
300 * @param prop_name name of property to find
301 * @param index which address to retrieve from a list of addresses. Often 0.
302 * @param na the number of cells used to represent an address
303 * @param ns the number of cells used to represent a size
304 * @param sizep a pointer to store the size into. Use NULL if not required
305 * @param translate Indicates whether to translate the returned value
306 * using the parent node's ranges property.
307 * @return address, if found, or FDT_ADDR_T_NONE if not
309 fdt_addr_t fdtdec_get_addr_size_fixed(const void *blob, int node,
310 const char *prop_name, int index, int na, int ns,
311 fdt_size_t *sizep, bool translate);
314 * Look up an address property in a node and return the parsed address, and
315 * optionally the parsed size.
317 * This variant automatically determines the number of cells used to represent
318 * the address and size by parsing the provided parent node's #address-cells
319 * and #size-cells properties.
321 * @param blob FDT blob
322 * @param parent parent node of @node
323 * @param node node to examine
324 * @param prop_name name of property to find
325 * @param index which address to retrieve from a list of addresses. Often 0.
326 * @param sizep a pointer to store the size into. Use NULL if not required
327 * @param translate Indicates whether to translate the returned value
328 * using the parent node's ranges property.
329 * @return address, if found, or FDT_ADDR_T_NONE if not
331 fdt_addr_t fdtdec_get_addr_size_auto_parent(const void *blob, int parent,
332 int node, const char *prop_name, int index, fdt_size_t *sizep,
336 * Look up an address property in a node and return the parsed address, and
337 * optionally the parsed size.
339 * This variant automatically determines the number of cells used to represent
340 * the address and size by parsing the parent node's #address-cells
341 * and #size-cells properties. The parent node is automatically found.
343 * The automatic parent lookup implemented by this function is slow.
344 * Consequently, fdtdec_get_addr_size_auto_parent() should be used where
347 * @param blob FDT blob
348 * @param parent parent node of @node
349 * @param node node to examine
350 * @param prop_name name of property to find
351 * @param index which address to retrieve from a list of addresses. Often 0.
352 * @param sizep a pointer to store the size into. Use NULL if not required
353 * @param translate Indicates whether to translate the returned value
354 * using the parent node's ranges property.
355 * @return address, if found, or FDT_ADDR_T_NONE if not
357 fdt_addr_t fdtdec_get_addr_size_auto_noparent(const void *blob, int node,
358 const char *prop_name, int index, fdt_size_t *sizep,
362 * Look up an address property in a node and return the parsed address.
364 * This variant hard-codes the number of cells used to represent the address
365 * and size based on sizeof(fdt_addr_t) and sizeof(fdt_size_t). It also
366 * always returns the first address value in the property (index 0).
368 * Use of this function is not recommended due to the hard-coding of cell
369 * counts. There is no programmatic validation that these hard-coded values
370 * actually match the device tree content in any way at all. This assumption
371 * can be satisfied by manually ensuring CONFIG_PHYS_64BIT is appropriately
372 * set in the U-Boot build and exercising strict control over DT content to
373 * ensure use of matching #address-cells/#size-cells properties. However, this
374 * approach is error-prone; those familiar with DT will not expect the
375 * assumption to exist, and could easily invalidate it. If the assumption is
376 * invalidated, this function will not report the issue, and debugging will
377 * be required. Instead, use fdtdec_get_addr_size_auto_parent().
379 * @param blob FDT blob
380 * @param node node to examine
381 * @param prop_name name of property to find
382 * @return address, if found, or FDT_ADDR_T_NONE if not
384 fdt_addr_t fdtdec_get_addr(const void *blob, int node,
385 const char *prop_name);
388 * Look up an address property in a node and return the parsed address, and
389 * optionally the parsed size.
391 * This variant hard-codes the number of cells used to represent the address
392 * and size based on sizeof(fdt_addr_t) and sizeof(fdt_size_t). It also
393 * always returns the first address value in the property (index 0).
395 * Use of this function is not recommended due to the hard-coding of cell
396 * counts. There is no programmatic validation that these hard-coded values
397 * actually match the device tree content in any way at all. This assumption
398 * can be satisfied by manually ensuring CONFIG_PHYS_64BIT is appropriately
399 * set in the U-Boot build and exercising strict control over DT content to
400 * ensure use of matching #address-cells/#size-cells properties. However, this
401 * approach is error-prone; those familiar with DT will not expect the
402 * assumption to exist, and could easily invalidate it. If the assumption is
403 * invalidated, this function will not report the issue, and debugging will
404 * be required. Instead, use fdtdec_get_addr_size_auto_parent().
406 * @param blob FDT blob
407 * @param node node to examine
408 * @param prop_name name of property to find
409 * @param sizep a pointer to store the size into. Use NULL if not required
410 * @return address, if found, or FDT_ADDR_T_NONE if not
412 fdt_addr_t fdtdec_get_addr_size(const void *blob, int node,
413 const char *prop_name, fdt_size_t *sizep);
416 * Look at an address property in a node and return the pci address which
417 * corresponds to the given type in the form of fdt_pci_addr.
418 * The property must hold one fdt_pci_addr with a lengh.
420 * @param blob FDT blob
421 * @param node node to examine
422 * @param type pci address type (FDT_PCI_SPACE_xxx)
423 * @param prop_name name of property to find
424 * @param addr returns pci address in the form of fdt_pci_addr
425 * @return 0 if ok, -ENOENT if the property did not exist, -EINVAL if the
426 * format of the property was invalid, -ENXIO if the requested
427 * address type was not found
429 int fdtdec_get_pci_addr(const void *blob, int node, enum fdt_pci_space type,
430 const char *prop_name, struct fdt_pci_addr *addr);
433 * Look at the compatible property of a device node that represents a PCI
434 * device and extract pci vendor id and device id from it.
436 * @param blob FDT blob
437 * @param node node to examine
438 * @param vendor vendor id of the pci device
439 * @param device device id of the pci device
440 * @return 0 if ok, negative on error
442 int fdtdec_get_pci_vendev(const void *blob, int node,
443 u16 *vendor, u16 *device);
446 * Look at the pci address of a device node that represents a PCI device
447 * and return base address of the pci device's registers.
449 * @param dev device to examine
450 * @param addr pci address in the form of fdt_pci_addr
451 * @param bar returns base address of the pci device's registers
452 * @return 0 if ok, negative on error
454 int fdtdec_get_pci_bar32(struct udevice *dev, struct fdt_pci_addr *addr,
458 * Look up a 32-bit integer property in a node and return it. The property
459 * must have at least 4 bytes of data. The value of the first cell is
462 * @param blob FDT blob
463 * @param node node to examine
464 * @param prop_name name of property to find
465 * @param default_val default value to return if the property is not found
466 * @return integer value, if found, or default_val if not
468 s32 fdtdec_get_int(const void *blob, int node, const char *prop_name,
472 * Unsigned version of fdtdec_get_int. The property must have at least
473 * 4 bytes of data. The value of the first cell is returned.
475 * @param blob FDT blob
476 * @param node node to examine
477 * @param prop_name name of property to find
478 * @param default_val default value to return if the property is not found
479 * @return unsigned integer value, if found, or default_val if not
481 unsigned int fdtdec_get_uint(const void *blob, int node, const char *prop_name,
482 unsigned int default_val);
485 * Get a variable-sized number from a property
487 * This reads a number from one or more cells.
489 * @param ptr Pointer to property
490 * @param cells Number of cells containing the number
491 * @return the value in the cells
493 u64 fdtdec_get_number(const fdt32_t *ptr, unsigned int cells);
496 * Look up a 64-bit integer property in a node and return it. The property
497 * must have at least 8 bytes of data (2 cells). The first two cells are
498 * concatenated to form a 8 bytes value, where the first cell is top half and
499 * the second cell is bottom half.
501 * @param blob FDT blob
502 * @param node node to examine
503 * @param prop_name name of property to find
504 * @param default_val default value to return if the property is not found
505 * @return integer value, if found, or default_val if not
507 uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
508 uint64_t default_val);
511 * Checks whether a node is enabled.
512 * This looks for a 'status' property. If this exists, then returns 1 if
513 * the status is 'ok' and 0 otherwise. If there is no status property,
514 * it returns 1 on the assumption that anything mentioned should be enabled
517 * @param blob FDT blob
518 * @param node node to examine
519 * @return integer value 0 (not enabled) or 1 (enabled)
521 int fdtdec_get_is_enabled(const void *blob, int node);
524 * Make sure we have a valid fdt available to control U-Boot.
526 * If not, a message is printed to the console if the console is ready.
528 * @return 0 if all ok, -1 if not
530 int fdtdec_prepare_fdt(void);
533 * Checks that we have a valid fdt available to control U-Boot.
535 * However, if not then for the moment nothing is done, since this function
536 * is called too early to panic().
540 int fdtdec_check_fdt(void);
543 * Find the nodes for a peripheral and return a list of them in the correct
544 * order. This is used to enumerate all the peripherals of a certain type.
546 * To use this, optionally set up a /aliases node with alias properties for
547 * a peripheral. For example, for usb you could have:
550 * usb0 = "/ehci@c5008000";
551 * usb1 = "/ehci@c5000000";
554 * Pass "usb" as the name to this function and will return a list of two
555 * nodes offsets: /ehci@c5008000 and ehci@c5000000.
557 * All nodes returned will match the compatible ID, as it is assumed that
558 * all peripherals use the same driver.
560 * If no alias node is found, then the node list will be returned in the
561 * order found in the fdt. If the aliases mention a node which doesn't
562 * exist, then this will be ignored. If nodes are found with no aliases,
563 * they will be added in any order.
565 * If there is a gap in the aliases, then this function return a 0 node at
566 * that position. The return value will also count these gaps.
568 * This function checks node properties and will not return nodes which are
569 * marked disabled (status = "disabled").
571 * @param blob FDT blob to use
572 * @param name Root name of alias to search for
573 * @param id Compatible ID to look for
574 * @param node_list Place to put list of found nodes
575 * @param maxcount Maximum number of nodes to find
576 * @return number of nodes found on success, FDT_ERR_... on error
578 int fdtdec_find_aliases_for_id(const void *blob, const char *name,
579 enum fdt_compat_id id, int *node_list, int maxcount);
582 * This function is similar to fdtdec_find_aliases_for_id() except that it
583 * adds to the node_list that is passed in. Any 0 elements are considered
584 * available for allocation - others are considered already used and are
587 * You can use this by calling fdtdec_find_aliases_for_id() with an
588 * uninitialised array, then setting the elements that are returned to -1,
589 * say, then calling this function, perhaps with a different compat id.
590 * Any elements you get back that are >0 are new nodes added by the call
593 * Note that if you have some nodes with aliases and some without, you are
594 * sailing close to the wind. The call to fdtdec_find_aliases_for_id() with
595 * one compat_id may fill in positions for which you have aliases defined
596 * for another compat_id. When you later call *this* function with the second
597 * compat_id, the alias positions may already be used. A debug warning may
598 * be generated in this case, but it is safest to define aliases for all
599 * nodes when you care about the ordering.
601 int fdtdec_add_aliases_for_id(const void *blob, const char *name,
602 enum fdt_compat_id id, int *node_list, int maxcount);
605 * Get the alias sequence number of a node
607 * This works out whether a node is pointed to by an alias, and if so, the
608 * sequence number of that alias. Aliases are of the form <base><num> where
609 * <num> is the sequence number. For example spi2 would be sequence number
612 * @param blob Device tree blob (if NULL, then error is returned)
613 * @param base Base name for alias (before the underscore)
614 * @param node Node to look up
615 * @param seqp This is set to the sequence number if one is found,
616 * but otherwise the value is left alone
617 * @return 0 if a sequence was found, -ve if not
619 int fdtdec_get_alias_seq(const void *blob, const char *base, int node,
623 * Get a property from the /chosen node
625 * @param blob Device tree blob (if NULL, then NULL is returned)
626 * @param name Property name to look up
627 * @return Value of property, or NULL if it does not exist
629 const char *fdtdec_get_chosen_prop(const void *blob, const char *name);
632 * Get the offset of the given /chosen node
634 * This looks up a property in /chosen containing the path to another node,
635 * then finds the offset of that node.
637 * @param blob Device tree blob (if NULL, then error is returned)
638 * @param name Property name, e.g. "stdout-path"
639 * @return Node offset referred to by that chosen node, or -ve FDT_ERR_...
641 int fdtdec_get_chosen_node(const void *blob, const char *name);
644 * Get the name for a compatible ID
646 * @param id Compatible ID to look for
647 * @return compatible string for that id
649 const char *fdtdec_get_compatible(enum fdt_compat_id id);
651 /* Look up a phandle and follow it to its node. Then return the offset
654 * @param blob FDT blob
655 * @param node node to examine
656 * @param prop_name name of property to find
657 * @return node offset if found, -ve error code on error
659 int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name);
662 * Look up a property in a node and return its contents in an integer
663 * array of given length. The property must have at least enough data for
664 * the array (4*count bytes). It may have more, but this will be ignored.
666 * @param blob FDT blob
667 * @param node node to examine
668 * @param prop_name name of property to find
669 * @param array array to fill with data
670 * @param count number of array elements
671 * @return 0 if ok, or -FDT_ERR_NOTFOUND if the property is not found,
672 * or -FDT_ERR_BADLAYOUT if not enough data
674 int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
675 u32 *array, int count);
678 * Look up a property in a node and return its contents in an integer
679 * array of given length. The property must exist but may have less data that
680 * expected (4*count bytes). It may have more, but this will be ignored.
682 * @param blob FDT blob
683 * @param node node to examine
684 * @param prop_name name of property to find
685 * @param array array to fill with data
686 * @param count number of array elements
687 * @return number of array elements if ok, or -FDT_ERR_NOTFOUND if the
688 * property is not found
690 int fdtdec_get_int_array_count(const void *blob, int node,
691 const char *prop_name, u32 *array, int count);
694 * Look up a property in a node and return a pointer to its contents as a
695 * unsigned int array of given length. The property must have at least enough
696 * data for the array ('count' cells). It may have more, but this will be
697 * ignored. The data is not copied.
699 * Note that you must access elements of the array with fdt32_to_cpu(),
700 * since the elements will be big endian even on a little endian machine.
702 * @param blob FDT blob
703 * @param node node to examine
704 * @param prop_name name of property to find
705 * @param count number of array elements
706 * @return pointer to array if found, or NULL if the property is not
707 * found or there is not enough data
709 const u32 *fdtdec_locate_array(const void *blob, int node,
710 const char *prop_name, int count);
713 * Look up a boolean property in a node and return it.
715 * A boolean properly is true if present in the device tree and false if not
716 * present, regardless of its value.
718 * @param blob FDT blob
719 * @param node node to examine
720 * @param prop_name name of property to find
721 * @return 1 if the properly is present; 0 if it isn't present
723 int fdtdec_get_bool(const void *blob, int node, const char *prop_name);
726 * Count child nodes of one parent node.
728 * @param blob FDT blob
729 * @param node parent node
730 * @return number of child node; 0 if there is not child node
732 int fdtdec_get_child_count(const void *blob, int node);
735 * Look in the FDT for a config item with the given name and return its value
736 * as a 32-bit integer. The property must have at least 4 bytes of data. The
737 * value of the first cell is returned.
739 * @param blob FDT blob to use
740 * @param prop_name Node property name
741 * @param default_val default value to return if the property is not found
742 * @return integer value, if found, or default_val if not
744 int fdtdec_get_config_int(const void *blob, const char *prop_name,
748 * Look in the FDT for a config item with the given name
749 * and return whether it exists.
751 * @param blob FDT blob
752 * @param prop_name property name to look up
753 * @return 1, if it exists, or 0 if not
755 int fdtdec_get_config_bool(const void *blob, const char *prop_name);
758 * Look in the FDT for a config item with the given name and return its value
761 * @param blob FDT blob
762 * @param prop_name property name to look up
763 * @returns property string, NULL on error.
765 char *fdtdec_get_config_string(const void *blob, const char *prop_name);
768 * Look up a property in a node and return its contents in a byte
769 * array of given length. The property must have at least enough data for
770 * the array (count bytes). It may have more, but this will be ignored.
772 * @param blob FDT blob
773 * @param node node to examine
774 * @param prop_name name of property to find
775 * @param array array to fill with data
776 * @param count number of array elements
777 * @return 0 if ok, or -FDT_ERR_MISSING if the property is not found,
778 * or -FDT_ERR_BADLAYOUT if not enough data
780 int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
781 u8 *array, int count);
784 * Look up a property in a node and return a pointer to its contents as a
785 * byte array of given length. The property must have at least enough data
786 * for the array (count bytes). It may have more, but this will be ignored.
787 * The data is not copied.
789 * @param blob FDT blob
790 * @param node node to examine
791 * @param prop_name name of property to find
792 * @param count number of array elements
793 * @return pointer to byte array if found, or NULL if the property is not
794 * found or there is not enough data
796 const u8 *fdtdec_locate_byte_array(const void *blob, int node,
797 const char *prop_name, int count);
800 * Look up a property in a node which contains a memory region address and
801 * size. Then return a pointer to this address.
803 * The property must hold one address with a length. This is only tested on
806 * @param blob FDT blob
807 * @param node node to examine
808 * @param prop_name name of property to find
809 * @param basep Returns base address of region
810 * @param size Returns size of region
811 * @return 0 if ok, -1 on error (property not found)
813 int fdtdec_decode_region(const void *blob, int node, const char *prop_name,
814 fdt_addr_t *basep, fdt_size_t *sizep);
817 * Obtain an indexed resource from a device property.
819 * @param fdt FDT blob
820 * @param node node to examine
821 * @param property name of the property to parse
822 * @param index index of the resource to retrieve
823 * @param res returns the resource
824 * @return 0 if ok, negative on error
826 int fdt_get_resource(const void *fdt, int node, const char *property,
827 unsigned int index, struct fdt_resource *res);
830 * Obtain a named resource from a device property.
832 * Look up the index of the name in a list of strings and return the resource
835 * @param fdt FDT blob
836 * @param node node to examine
837 * @param property name of the property to parse
838 * @param prop_names name of the property containing the list of names
839 * @param name the name of the entry to look up
840 * @param res returns the resource
842 int fdt_get_named_resource(const void *fdt, int node, const char *property,
843 const char *prop_names, const char *name,
844 struct fdt_resource *res);
847 * Decode a named region within a memory bank of a given type.
849 * This function handles selection of a memory region. The region is
850 * specified as an offset/size within a particular type of memory.
852 * The properties used are:
854 * <mem_type>-memory<suffix> for the name of the memory bank
855 * <mem_type>-offset<suffix> for the offset in that bank
857 * The property value must have an offset and a size. The function checks
858 * that the region is entirely within the memory bank.5
860 * @param blob FDT blob
861 * @param node Node containing the properties (-1 for /config)
862 * @param mem_type Type of memory to use, which is a name, such as
863 * "u-boot" or "kernel".
864 * @param suffix String to append to the memory/offset
866 * @param basep Returns base of region
867 * @param sizep Returns size of region
868 * @return 0 if OK, -ive on error
870 int fdtdec_decode_memory_region(const void *blob, int node,
871 const char *mem_type, const char *suffix,
872 fdt_addr_t *basep, fdt_size_t *sizep);
874 /* Display timings from linux include/video/display_timing.h */
876 DISPLAY_FLAGS_HSYNC_LOW = 1 << 0,
877 DISPLAY_FLAGS_HSYNC_HIGH = 1 << 1,
878 DISPLAY_FLAGS_VSYNC_LOW = 1 << 2,
879 DISPLAY_FLAGS_VSYNC_HIGH = 1 << 3,
881 /* data enable flag */
882 DISPLAY_FLAGS_DE_LOW = 1 << 4,
883 DISPLAY_FLAGS_DE_HIGH = 1 << 5,
884 /* drive data on pos. edge */
885 DISPLAY_FLAGS_PIXDATA_POSEDGE = 1 << 6,
886 /* drive data on neg. edge */
887 DISPLAY_FLAGS_PIXDATA_NEGEDGE = 1 << 7,
888 DISPLAY_FLAGS_INTERLACED = 1 << 8,
889 DISPLAY_FLAGS_DOUBLESCAN = 1 << 9,
890 DISPLAY_FLAGS_DOUBLECLK = 1 << 10,
894 * A single signal can be specified via a range of minimal and maximal values
895 * with a typical value, that lies somewhere inbetween.
897 struct timing_entry {
904 * Single "mode" entry. This describes one set of signal timings a display can
905 * have in one setting. This struct can later be converted to struct videomode
906 * (see include/video/videomode.h). As each timing_entry can be defined as a
907 * range, one struct display_timing may become multiple struct videomodes.
909 * Example: hsync active high, vsync active low
912 * Video ______________________XXXXXXXXXXXXXXXXXXXXXX_____________________
913 * |<- sync ->|<- back ->|<----- active ----->|<- front ->|<- sync..
914 * | | porch | | porch |
916 * HSync _|¯¯¯¯¯¯¯¯¯¯|___________________________________________|¯¯¯¯¯¯¯¯¯
918 * VSync ¯|__________|¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯|_________
920 struct display_timing {
921 struct timing_entry pixelclock;
923 struct timing_entry hactive; /* hor. active video */
924 struct timing_entry hfront_porch; /* hor. front porch */
925 struct timing_entry hback_porch; /* hor. back porch */
926 struct timing_entry hsync_len; /* hor. sync len */
928 struct timing_entry vactive; /* ver. active video */
929 struct timing_entry vfront_porch; /* ver. front porch */
930 struct timing_entry vback_porch; /* ver. back porch */
931 struct timing_entry vsync_len; /* ver. sync len */
933 enum display_flags flags; /* display flags */
934 bool hdmi_monitor; /* is hdmi monitor? */
938 * fdtdec_decode_display_timing() - decode display timings
940 * Decode display timings from the supplied 'display-timings' node.
941 * See doc/device-tree-bindings/video/display-timing.txt for binding
944 * @param blob FDT blob
945 * @param node 'display-timing' node containing the timing subnodes
946 * @param index Index number to read (0=first timing subnode)
947 * @param config Place to put timings
948 * @return 0 if OK, -FDT_ERR_NOTFOUND if not found
950 int fdtdec_decode_display_timing(const void *blob, int node, int index,
951 struct display_timing *config);
954 * fdtdec_setup_memory_size() - decode and setup gd->ram_size
956 * Decode the /memory 'reg' property to determine the size of the first memory
957 * bank, populate the global data with the size of the first bank of memory.
959 * This function should be called from a boards dram_init(). This helper
960 * function allows for boards to query the device tree for DRAM size instead of
961 * hard coding the value in the case where the memory size cannot be detected
964 * @return 0 if OK, -EINVAL if the /memory node or reg property is missing or
967 int fdtdec_setup_memory_size(void);
970 * fdtdec_setup_memory_banksize() - decode and populate gd->bd->bi_dram
972 * Decode the /memory 'reg' property to determine the address and size of the
973 * memory banks. Use this data to populate the global data board info with the
974 * phys address and size of memory banks.
976 * This function should be called from a boards dram_init_banksize(). This
977 * helper function allows for boards to query the device tree for memory bank
978 * information instead of hard coding the information in cases where it cannot
979 * be detected automatically.
981 * @return 0 if OK, -EINVAL if the /memory node or reg property is missing or
984 int fdtdec_setup_memory_banksize(void);
987 * Set up the device tree ready for use
989 int fdtdec_setup(void);
992 * Board-specific FDT initialization. Returns the address to a device tree blob.
993 * Called when CONFIG_OF_BOARD is defined, or if CONFIG_OF_SEPARATE is defined
994 * and the board implements it.
996 void *board_fdt_blob_setup(void);