1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Copyright (c) 2013 Google, Inc
6 * Pavel Herrmann <morpheus.ibis@gmail.com>
7 * Marek Vasut <marex@denx.de>
13 #include <dm/ofnode.h>
14 #include <dm/uclass-id.h>
16 #include <linker_lists.h>
17 #include <linux/kernel.h>
18 #include <linux/list.h>
19 #include <linux/printk.h>
23 /* Driver is active (probed). Cleared when it is removed */
24 #define DM_FLAG_ACTIVATED (1 << 0)
26 /* DM is responsible for allocating and freeing plat */
27 #define DM_FLAG_ALLOC_PDATA (1 << 1)
29 /* DM should init this device prior to relocation */
30 #define DM_FLAG_PRE_RELOC (1 << 2)
32 /* DM is responsible for allocating and freeing parent_plat */
33 #define DM_FLAG_ALLOC_PARENT_PDATA (1 << 3)
35 /* DM is responsible for allocating and freeing uclass_plat */
36 #define DM_FLAG_ALLOC_UCLASS_PDATA (1 << 4)
38 /* Allocate driver private data on a DMA boundary */
39 #define DM_FLAG_ALLOC_PRIV_DMA (1 << 5)
42 #define DM_FLAG_BOUND (1 << 6)
44 /* Device name is allocated and should be freed on unbind() */
45 #define DM_FLAG_NAME_ALLOCED (1 << 7)
47 /* Device has platform data provided by of-platdata */
48 #define DM_FLAG_OF_PLATDATA (1 << 8)
51 * Call driver remove function to stop currently active DMA transfers or
52 * give DMA buffers back to the HW / controller. This may be needed for
53 * some drivers to do some final stage cleanup before the OS is called
56 #define DM_FLAG_ACTIVE_DMA (1 << 9)
59 * Call driver remove function to do some final configuration, before
60 * U-Boot exits and the OS is started
62 #define DM_FLAG_OS_PREPARE (1 << 10)
64 /* DM does not enable/disable the power domains corresponding to this device */
65 #define DM_FLAG_DEFAULT_PD_CTRL_OFF (1 << 11)
67 /* Driver plat has been read. Cleared when the device is removed */
68 #define DM_FLAG_PLATDATA_VALID (1 << 12)
71 * Device is removed without switching off its power domain. This might
72 * be required, i. e. for serial console (debug) output when booting OS.
74 #define DM_FLAG_REMOVE_WITH_PD_ON (1 << 13)
77 * One or multiple of these flags are passed to device_remove() so that
78 * a selective device removal as specified by the remove-stage and the
79 * driver flags can be done.
82 /* Normal remove, remove all devices */
83 DM_REMOVE_NORMAL = 1 << 0,
85 /* Remove devices with active DMA */
86 DM_REMOVE_ACTIVE_DMA = DM_FLAG_ACTIVE_DMA,
88 /* Remove devices which need some final OS preparation steps */
89 DM_REMOVE_OS_PREPARE = DM_FLAG_OS_PREPARE,
91 /* Add more use cases here */
93 /* Remove devices with any active flag */
94 DM_REMOVE_ACTIVE_ALL = DM_REMOVE_ACTIVE_DMA | DM_REMOVE_OS_PREPARE,
96 /* Don't power down any attached power domains */
97 DM_REMOVE_NO_PD = 1 << 1,
101 * struct udevice - An instance of a driver
103 * This holds information about a device, which is a driver bound to a
104 * particular port or peripheral (essentially a driver instance).
106 * A device will come into existence through a 'bind' call, either due to
107 * a U_BOOT_DEVICE() macro (in which case plat is non-NULL) or a node
108 * in the device tree (in which case of_offset is >= 0). In the latter case
109 * we translate the device tree information into plat in a function
110 * implemented by the driver of_to_plat method (called just before the
111 * probe method if the device has a device tree node.
113 * All three of plat, priv and uclass_priv can be allocated by the
114 * driver, or you can use the auto_alloc_size members of struct driver and
115 * struct uclass_driver to have driver model do this automatically.
117 * @driver: The driver used by this device
118 * @name: Name of device, typically the FDT node name
119 * @plat: Configuration data for this device
120 * @parent_plat: The parent bus's configuration data for this device
121 * @uclass_plat: The uclass's configuration data for this device
122 * @node: Reference to device tree node for this device
123 * @driver_data: Driver data word for the entry that matched this device with
125 * @parent: Parent of this device, or NULL for the top level device
126 * @priv: Private data for this device
127 * @uclass: Pointer to uclass for this device
128 * @uclass_priv: The uclass's private data for this device
129 * @parent_priv: The parent's private data for this device
130 * @uclass_node: Used by uclass to link its devices
131 * @child_head: List of children of this device
132 * @sibling_node: Next device in list of all devices
133 * @flags: Flags for this device DM_FLAG_...
134 * @req_seq: Requested sequence number for this device (-1 = any)
135 * @seq: Allocated sequence number for this device (-1 = none). This is set up
136 * when the device is probed and will be unique within the device's uclass.
137 * @devres_head: List of memory allocations associated with this device.
138 * When CONFIG_DEVRES is enabled, devm_kmalloc() and friends will
139 * add to this list. Memory so-allocated will be freed
140 * automatically when the device is removed / unbound
143 const struct driver *driver;
150 struct udevice *parent;
152 struct uclass *uclass;
155 struct list_head uclass_node;
156 struct list_head child_head;
157 struct list_head sibling_node;
162 struct list_head devres_head;
166 /* Maximum sequence number supported */
167 #define DM_MAX_SEQ 999
169 /* Returns the operations for a device */
170 #define device_get_ops(dev) (dev->driver->ops)
172 /* Returns non-zero if the device is active (probed and not removed) */
173 #define device_active(dev) ((dev)->flags & DM_FLAG_ACTIVATED)
175 static inline int dev_of_offset(const struct udevice *dev)
177 return ofnode_to_offset(dev->node);
180 static inline bool dev_has_of_node(struct udevice *dev)
182 return ofnode_valid(dev->node);
186 * struct udevice_id - Lists the compatible strings supported by a driver
187 * @compatible: Compatible string
188 * @data: Data for this compatible string
191 const char *compatible;
195 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
196 #define of_match_ptr(_ptr) (_ptr)
198 #define of_match_ptr(_ptr) NULL
199 #endif /* CONFIG_IS_ENABLED(OF_CONTROL) */
202 * struct driver - A driver for a feature or peripheral
204 * This holds methods for setting up a new device, and also removing it.
205 * The device needs information to set itself up - this is provided either
206 * by plat or a device tree node (which we find by looking up
207 * matching compatible strings with of_match).
209 * Drivers all belong to a uclass, representing a class of devices of the
210 * same type. Common elements of the drivers can be implemented in the uclass,
211 * or the uclass can provide a consistent interface to the drivers within
215 * @id: Identifies the uclass we belong to
216 * @of_match: List of compatible strings to match, and any identifying data
218 * @bind: Called to bind a device to its driver
219 * @probe: Called to probe a device, i.e. activate it
220 * @remove: Called to remove a device, i.e. de-activate it
221 * @unbind: Called to unbind a device from its driver
222 * @of_to_plat: Called before probe to decode device tree data
223 * @child_post_bind: Called after a new child has been bound
224 * @child_pre_probe: Called before a child device is probed. The device has
225 * memory allocated but it has not yet been probed.
226 * @child_post_remove: Called after a child device is removed. The device
227 * has memory allocated but its device_remove() method has been called.
228 * @priv_auto: If non-zero this is the size of the private data
229 * to be allocated in the device's ->priv pointer. If zero, then the driver
230 * is responsible for allocating any data required.
231 * @plat_auto: If non-zero this is the size of the
232 * platform data to be allocated in the device's ->plat pointer.
233 * This is typically only useful for device-tree-aware drivers (those with
234 * an of_match), since drivers which use plat will have the data
235 * provided in the U_BOOT_DEVICE() instantiation.
236 * @per_child_auto: Each device can hold private data owned by
237 * its parent. If required this will be automatically allocated if this
239 * @per_child_plat_auto: A bus likes to store information about
240 * its children. If non-zero this is the size of this data, to be allocated
241 * in the child's parent_plat pointer.
242 * @ops: Driver-specific operations. This is typically a list of function
243 * pointers defined by the driver, to implement driver functions required by
245 * @flags: driver flags - see DM_FLAGS_...
246 * @acpi_ops: Advanced Configuration and Power Interface (ACPI) operations,
247 * allowing the device to add things to the ACPI tables passed to Linux
252 const struct udevice_id *of_match;
253 int (*bind)(struct udevice *dev);
254 int (*probe)(struct udevice *dev);
255 int (*remove)(struct udevice *dev);
256 int (*unbind)(struct udevice *dev);
257 int (*of_to_plat)(struct udevice *dev);
258 int (*child_post_bind)(struct udevice *dev);
259 int (*child_pre_probe)(struct udevice *dev);
260 int (*child_post_remove)(struct udevice *dev);
264 int per_child_plat_auto;
265 const void *ops; /* driver-specific operations */
267 #if CONFIG_IS_ENABLED(ACPIGEN)
268 struct acpi_ops *acpi_ops;
272 /* Declare a new U-Boot driver */
273 #define U_BOOT_DRIVER(__name) \
274 ll_entry_declare(struct driver, __name, driver)
276 /* Get a pointer to a given driver */
277 #define DM_GET_DRIVER(__name) \
278 ll_entry_get(struct driver, __name, driver)
281 * Declare a macro to state a alias for a driver name. This macro will
282 * produce no code but its information will be parsed by tools like
285 #define U_BOOT_DRIVER_ALIAS(__name, __alias)
288 * dev_get_plat() - Get the platform data for a device
290 * This checks that dev is not NULL, but no other checks for now
292 * @dev Device to check
293 * @return platform data, or NULL if none
295 void *dev_get_plat(const struct udevice *dev);
298 * dev_get_parent_plat() - Get the parent platform data for a device
300 * This checks that dev is not NULL, but no other checks for now
302 * @dev Device to check
303 * @return parent's platform data, or NULL if none
305 void *dev_get_parent_plat(const struct udevice *dev);
308 * dev_get_uclass_plat() - Get the uclass platform data for a device
310 * This checks that dev is not NULL, but no other checks for now
312 * @dev Device to check
313 * @return uclass's platform data, or NULL if none
315 void *dev_get_uclass_plat(const struct udevice *dev);
318 * dev_get_priv() - Get the private data for a device
320 * This checks that dev is not NULL, but no other checks for now
322 * @dev Device to check
323 * @return private data, or NULL if none
325 void *dev_get_priv(const struct udevice *dev);
328 * dev_get_parent_priv() - Get the parent private data for a device
330 * The parent private data is data stored in the device but owned by the
331 * parent. For example, a USB device may have parent data which contains
332 * information about how to talk to the device over USB.
334 * This checks that dev is not NULL, but no other checks for now
336 * @dev Device to check
337 * @return parent data, or NULL if none
339 void *dev_get_parent_priv(const struct udevice *dev);
342 * dev_get_uclass_priv() - Get the private uclass data for a device
344 * This checks that dev is not NULL, but no other checks for now
346 * @dev Device to check
347 * @return private uclass data for this device, or NULL if none
349 void *dev_get_uclass_priv(const struct udevice *dev);
352 * struct dev_get_parent() - Get the parent of a device
354 * @child: Child to check
355 * @return parent of child, or NULL if this is the root device
357 struct udevice *dev_get_parent(const struct udevice *child);
360 * dev_get_driver_data() - get the driver data used to bind a device
362 * When a device is bound using a device tree node, it matches a
363 * particular compatible string in struct udevice_id. This function
364 * returns the associated data value for that compatible string. This is
365 * the 'data' field in struct udevice_id.
367 * As an example, consider this structure:
368 * static const struct udevice_id tegra_i2c_ids[] = {
369 * { .compatible = "nvidia,tegra114-i2c", .data = TYPE_114 },
370 * { .compatible = "nvidia,tegra20-i2c", .data = TYPE_STD },
371 * { .compatible = "nvidia,tegra20-i2c-dvc", .data = TYPE_DVC },
375 * When driver model finds a driver for this it will store the 'data' value
376 * corresponding to the compatible string it matches. This function returns
377 * that value. This allows the driver to handle several variants of a device.
379 * For USB devices, this is the driver_info field in struct usb_device_id.
381 * @dev: Device to check
382 * @return driver data (0 if none is provided)
384 ulong dev_get_driver_data(const struct udevice *dev);
387 * dev_get_driver_ops() - get the device's driver's operations
389 * This checks that dev is not NULL, and returns the pointer to device's
390 * driver's operations.
392 * @dev: Device to check
393 * @return void pointer to driver's operations or NULL for NULL-dev or NULL-ops
395 const void *dev_get_driver_ops(const struct udevice *dev);
398 * device_get_uclass_id() - return the uclass ID of a device
400 * @dev: Device to check
401 * @return uclass ID for the device
403 enum uclass_id device_get_uclass_id(const struct udevice *dev);
406 * dev_get_uclass_name() - return the uclass name of a device
408 * This checks that dev is not NULL.
410 * @dev: Device to check
411 * @return pointer to the uclass name for the device
413 const char *dev_get_uclass_name(const struct udevice *dev);
416 * device_get_child() - Get the child of a device by index
418 * Returns the numbered child, 0 being the first. This does not use
419 * sequence numbers, only the natural order.
421 * @dev: Parent device to check
422 * @index: Child index
423 * @devp: Returns pointer to device
424 * @return 0 if OK, -ENODEV if no such device, other error if the device fails
427 int device_get_child(const struct udevice *parent, int index,
428 struct udevice **devp);
431 * device_get_child_count() - Get the available child count of a device
433 * Returns the number of children to a device.
435 * @parent: Parent device to check
437 int device_get_child_count(const struct udevice *parent);
440 * device_find_child_by_seq() - Find a child device based on a sequence
442 * This searches for a device with the given seq or req_seq.
444 * For seq, if an active device has this sequence it will be returned.
445 * If there is no such device then this will return -ENODEV.
447 * For req_seq, if a device (whether activated or not) has this req_seq
448 * value, that device will be returned. This is a strong indication that
449 * the device will receive that sequence when activated.
451 * @parent: Parent device
452 * @seq_or_req_seq: Sequence number to find (0=first)
453 * @find_req_seq: true to find req_seq, false to find seq
454 * @devp: Returns pointer to device (there is only one per for each seq).
455 * Set to NULL if none is found
456 * @return 0 if OK, -ve on error
458 int device_find_child_by_seq(const struct udevice *parent, int seq_or_req_seq,
459 bool find_req_seq, struct udevice **devp);
462 * device_get_child_by_seq() - Get a child device based on a sequence
464 * If an active device has this sequence it will be returned. If there is no
465 * such device then this will check for a device that is requesting this
468 * The device is probed to activate it ready for use.
470 * @parent: Parent device
471 * @seq: Sequence number to find (0=first)
472 * @devp: Returns pointer to device (there is only one per for each seq)
473 * Set to NULL if none is found
474 * @return 0 if OK, -ve on error
476 int device_get_child_by_seq(const struct udevice *parent, int seq,
477 struct udevice **devp);
480 * device_find_child_by_of_offset() - Find a child device based on FDT offset
482 * Locates a child device by its device tree offset.
484 * @parent: Parent device
485 * @of_offset: Device tree offset to find
486 * @devp: Returns pointer to device if found, otherwise this is set to NULL
487 * @return 0 if OK, -ve on error
489 int device_find_child_by_of_offset(const struct udevice *parent, int of_offset,
490 struct udevice **devp);
493 * device_get_child_by_of_offset() - Get a child device based on FDT offset
495 * Locates a child device by its device tree offset.
497 * The device is probed to activate it ready for use.
499 * @parent: Parent device
500 * @of_offset: Device tree offset to find
501 * @devp: Returns pointer to device if found, otherwise this is set to NULL
502 * @return 0 if OK, -ve on error
504 int device_get_child_by_of_offset(const struct udevice *parent, int of_offset,
505 struct udevice **devp);
508 * device_find_global_by_ofnode() - Get a device based on ofnode
510 * Locates a device by its device tree ofnode, searching globally throughout
511 * the all driver model devices.
513 * The device is NOT probed
515 * @node: Device tree ofnode to find
516 * @devp: Returns pointer to device if found, otherwise this is set to NULL
517 * @return 0 if OK, -ve on error
520 int device_find_global_by_ofnode(ofnode node, struct udevice **devp);
523 * device_get_global_by_ofnode() - Get a device based on ofnode
525 * Locates a device by its device tree ofnode, searching globally throughout
526 * the all driver model devices.
528 * The device is probed to activate it ready for use.
530 * @node: Device tree ofnode to find
531 * @devp: Returns pointer to device if found, otherwise this is set to NULL
532 * @return 0 if OK, -ve on error
534 int device_get_global_by_ofnode(ofnode node, struct udevice **devp);
537 * device_get_by_driver_info() - Get a device based on driver_info
539 * Locates a device by its struct driver_info, by using its reference which
540 * is updated during the bind process.
542 * The device is probed to activate it ready for use.
544 * @info: Struct driver_info
545 * @devp: Returns pointer to device if found, otherwise this is set to NULL
546 * @return 0 if OK, -ve on error
548 int device_get_by_driver_info(const struct driver_info *info,
549 struct udevice **devp);
552 * device_get_by_driver_info_idx() - Get a device based on driver_info index
554 * Locates a device by its struct driver_info, by using its index number which
555 * is written into the idx field of struct phandle_1_arg, etc.
557 * The device is probed to activate it ready for use.
559 * @idx: Index number of the driver_info structure (0=first)
560 * @devp: Returns pointer to device if found, otherwise this is set to NULL
561 * @return 0 if OK, -ve on error
563 int device_get_by_driver_info_idx(uint idx, struct udevice **devp);
566 * device_find_first_child() - Find the first child of a device
568 * @parent: Parent device to search
569 * @devp: Returns first child device, or NULL if none
572 int device_find_first_child(const struct udevice *parent,
573 struct udevice **devp);
576 * device_find_next_child() - Find the next child of a device
578 * @devp: Pointer to previous child device on entry. Returns pointer to next
579 * child device, or NULL if none
582 int device_find_next_child(struct udevice **devp);
585 * device_find_first_inactive_child() - Find the first inactive child
587 * This is used to locate an existing child of a device which is of a given
590 * The device is NOT probed
592 * @parent: Parent device to search
593 * @uclass_id: Uclass to look for
594 * @devp: Returns device found, if any
595 * @return 0 if found, else -ENODEV
597 int device_find_first_inactive_child(const struct udevice *parent,
598 enum uclass_id uclass_id,
599 struct udevice **devp);
602 * device_find_first_child_by_uclass() - Find the first child of a device in uc
604 * @parent: Parent device to search
605 * @uclass_id: Uclass to look for
606 * @devp: Returns first child device in that uclass, if any
607 * @return 0 if found, else -ENODEV
609 int device_find_first_child_by_uclass(const struct udevice *parent,
610 enum uclass_id uclass_id,
611 struct udevice **devp);
614 * device_find_child_by_name() - Find a child by device name
616 * @parent: Parent device to search
617 * @name: Name to look for
618 * @devp: Returns device found, if any
619 * @return 0 if found, else -ENODEV
621 int device_find_child_by_name(const struct udevice *parent, const char *name,
622 struct udevice **devp);
625 * device_first_child_ofdata_err() - Find the first child and reads its plat
627 * The of_to_plat() method is called on the child before it is returned,
628 * but the child is not probed.
630 * @parent: Parent to check
631 * @devp: Returns child that was found, if any
632 * @return 0 on success, -ENODEV if no children, other -ve on error
634 int device_first_child_ofdata_err(struct udevice *parent,
635 struct udevice **devp);
638 * device_next_child_ofdata_err() - Find the next child and read its plat
640 * The of_to_plat() method is called on the child before it is returned,
641 * but the child is not probed.
643 * @devp: On entry, points to the previous child; on exit returns the child that
645 * @return 0 on success, -ENODEV if no children, other -ve on error
647 int device_next_child_ofdata_err(struct udevice **devp);
650 * device_first_child_err() - Get the first child of a device
652 * The device returned is probed if necessary, and ready for use
654 * @parent: Parent device to search
655 * @devp: Returns device found, if any
656 * @return 0 if found, -ENODEV if not, -ve error if device failed to probe
658 int device_first_child_err(struct udevice *parent, struct udevice **devp);
661 * device_next_child_err() - Get the next child of a parent device
663 * The device returned is probed if necessary, and ready for use
665 * @devp: On entry, pointer to device to lookup. On exit, returns pointer
666 * to the next sibling if no error occurred
667 * @return 0 if found, -ENODEV if not, -ve error if device failed to probe
669 int device_next_child_err(struct udevice **devp);
672 * device_has_children() - check if a device has any children
674 * @dev: Device to check
675 * @return true if the device has one or more children
677 bool device_has_children(const struct udevice *dev);
680 * device_has_active_children() - check if a device has any active children
682 * @dev: Device to check
683 * @return true if the device has one or more children and at least one of
684 * them is active (probed).
686 bool device_has_active_children(const struct udevice *dev);
689 * device_is_last_sibling() - check if a device is the last sibling
691 * This function can be useful for display purposes, when special action needs
692 * to be taken when displaying the last sibling. This can happen when a tree
693 * view of devices is being displayed.
695 * @dev: Device to check
696 * @return true if there are no more siblings after this one - i.e. is it
699 bool device_is_last_sibling(const struct udevice *dev);
702 * device_set_name() - set the name of a device
704 * This must be called in the device's bind() method and no later. Normally
705 * this is unnecessary but for probed devices which don't get a useful name
706 * this function can be helpful.
708 * The name is allocated and will be freed automatically when the device is
711 * @dev: Device to update
712 * @name: New name (this string is allocated new memory and attached to
714 * @return 0 if OK, -ENOMEM if there is not enough memory to allocate the
717 int device_set_name(struct udevice *dev, const char *name);
720 * device_set_name_alloced() - note that a device name is allocated
722 * This sets the DM_FLAG_NAME_ALLOCED flag for the device, so that when it is
723 * unbound the name will be freed. This avoids memory leaks.
725 * @dev: Device to update
727 void device_set_name_alloced(struct udevice *dev);
730 * device_is_compatible() - check if the device is compatible with the compat
732 * This allows to check whether the device is comaptible with the compat.
734 * @dev: udevice pointer for which compatible needs to be verified.
735 * @compat: Compatible string which needs to verified in the given
737 * @return true if OK, false if the compatible is not found
739 bool device_is_compatible(const struct udevice *dev, const char *compat);
742 * of_machine_is_compatible() - check if the machine is compatible with
745 * This allows to check whether the machine is comaptible with the compat.
747 * @compat: Compatible string which needs to verified
748 * @return true if OK, false if the compatible is not found
750 bool of_machine_is_compatible(const char *compat);
753 * dev_disable_by_path() - Disable a device given its device tree path
755 * @path: The device tree path identifying the device to be disabled
756 * @return 0 on success, -ve on error
758 int dev_disable_by_path(const char *path);
761 * dev_enable_by_path() - Enable a device given its device tree path
763 * @path: The device tree path identifying the device to be enabled
764 * @return 0 on success, -ve on error
766 int dev_enable_by_path(const char *path);
769 * device_is_on_pci_bus - Test if a device is on a PCI bus
771 * @dev: device to test
772 * @return: true if it is on a PCI bus, false otherwise
774 static inline bool device_is_on_pci_bus(const struct udevice *dev)
776 return dev->parent && device_get_uclass_id(dev->parent) == UCLASS_PCI;
780 * device_foreach_child_safe() - iterate through child devices safely
782 * This allows the @pos child to be removed in the loop if required.
784 * @pos: struct udevice * for the current device
785 * @next: struct udevice * for the next device
786 * @parent: parent device to scan
788 #define device_foreach_child_safe(pos, next, parent) \
789 list_for_each_entry_safe(pos, next, &parent->child_head, sibling_node)
792 * device_foreach_child() - iterate through child devices
794 * @pos: struct udevice * for the current device
795 * @parent: parent device to scan
797 #define device_foreach_child(pos, parent) \
798 list_for_each_entry(pos, &parent->child_head, sibling_node)
801 * device_foreach_child_of_to_plat() - iterate through children
803 * This stops when it gets an error, with @pos set to the device that failed to
806 * This creates a for() loop which works through the available children of
807 * a device in order from start to end. Device ofdata is read by calling
808 * device_of_to_plat() on each one. The devices are not probed.
810 * @pos: struct udevice * for the current device
811 * @parent: parent device to scan
813 #define device_foreach_child_of_to_plat(pos, parent) \
814 for (int _ret = device_first_child_ofdata_err(parent, &dev); !_ret; \
815 _ret = device_next_child_ofdata_err(&dev))
818 * device_foreach_child_probe() - iterate through children, probing them
820 * This creates a for() loop which works through the available children of
821 * a device in order from start to end. Devices are probed if necessary,
824 * This stops when it gets an error, with @pos set to the device that failed to
827 * @pos: struct udevice * for the current device
828 * @parent: parent device to scan
830 #define device_foreach_child_probe(pos, parent) \
831 for (int _ret = device_first_child_err(parent, &dev); !_ret; \
832 _ret = device_next_child_err(&dev))
835 * dm_scan_fdt_dev() - Bind child device in the device tree
837 * This handles device which have sub-nodes in the device tree. It scans all
838 * sub-nodes and binds drivers for each node where a driver can be found.
840 * If this is called prior to relocation, only pre-relocation devices will be
841 * bound (those marked with u-boot,dm-pre-reloc in the device tree, or where
842 * the driver has the DM_FLAG_PRE_RELOC flag set). Otherwise, all devices will
845 * @dev: Device to scan
846 * @return 0 if OK, -ve on error
848 int dm_scan_fdt_dev(struct udevice *dev);