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 * @sqq: Allocated sequence number for this device (-1 = none). This is set up
135 * when the device is bound and is unique within the device's uclass. If the
136 * device has an alias in the devicetree then that is used to set the sequence
137 * number. Otherwise, the next available number is used. Sequence numbers are
138 * used by certain commands that need device to be numbered (e.g. 'mmc dev')
140 * The following two fields are deprecated:
141 * @req_seq: Requested sequence number for this device (-1 = any)
142 * @seq: Allocated sequence number for this device (-1 = none). This is set up
143 * when the device is probed and will be unique within the device's uclass.
144 * @devres_head: List of memory allocations associated with this device.
145 * When CONFIG_DEVRES is enabled, devm_kmalloc() and friends will
146 * add to this list. Memory so-allocated will be freed
147 * automatically when the device is removed / unbound
150 const struct driver *driver;
157 struct udevice *parent;
159 struct uclass *uclass;
162 struct list_head uclass_node;
163 struct list_head child_head;
164 struct list_head sibling_node;
170 struct list_head devres_head;
174 /* Maximum sequence number supported */
175 #define DM_MAX_SEQ 999
177 /* Returns the operations for a device */
178 #define device_get_ops(dev) (dev->driver->ops)
180 /* Returns non-zero if the device is active (probed and not removed) */
181 #define device_active(dev) ((dev)->flags & DM_FLAG_ACTIVATED)
183 static inline int dev_of_offset(const struct udevice *dev)
185 return ofnode_to_offset(dev->node);
188 static inline bool dev_has_of_node(struct udevice *dev)
190 return ofnode_valid(dev->node);
193 static inline int dev_seq(const struct udevice *dev)
199 * struct udevice_id - Lists the compatible strings supported by a driver
200 * @compatible: Compatible string
201 * @data: Data for this compatible string
204 const char *compatible;
208 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
209 #define of_match_ptr(_ptr) (_ptr)
211 #define of_match_ptr(_ptr) NULL
212 #endif /* CONFIG_IS_ENABLED(OF_CONTROL) */
215 * struct driver - A driver for a feature or peripheral
217 * This holds methods for setting up a new device, and also removing it.
218 * The device needs information to set itself up - this is provided either
219 * by plat or a device tree node (which we find by looking up
220 * matching compatible strings with of_match).
222 * Drivers all belong to a uclass, representing a class of devices of the
223 * same type. Common elements of the drivers can be implemented in the uclass,
224 * or the uclass can provide a consistent interface to the drivers within
228 * @id: Identifies the uclass we belong to
229 * @of_match: List of compatible strings to match, and any identifying data
231 * @bind: Called to bind a device to its driver
232 * @probe: Called to probe a device, i.e. activate it
233 * @remove: Called to remove a device, i.e. de-activate it
234 * @unbind: Called to unbind a device from its driver
235 * @of_to_plat: Called before probe to decode device tree data
236 * @child_post_bind: Called after a new child has been bound
237 * @child_pre_probe: Called before a child device is probed. The device has
238 * memory allocated but it has not yet been probed.
239 * @child_post_remove: Called after a child device is removed. The device
240 * has memory allocated but its device_remove() method has been called.
241 * @priv_auto: If non-zero this is the size of the private data
242 * to be allocated in the device's ->priv pointer. If zero, then the driver
243 * is responsible for allocating any data required.
244 * @plat_auto: If non-zero this is the size of the
245 * platform data to be allocated in the device's ->plat pointer.
246 * This is typically only useful for device-tree-aware drivers (those with
247 * an of_match), since drivers which use plat will have the data
248 * provided in the U_BOOT_DEVICE() instantiation.
249 * @per_child_auto: Each device can hold private data owned by
250 * its parent. If required this will be automatically allocated if this
252 * @per_child_plat_auto: A bus likes to store information about
253 * its children. If non-zero this is the size of this data, to be allocated
254 * in the child's parent_plat pointer.
255 * @ops: Driver-specific operations. This is typically a list of function
256 * pointers defined by the driver, to implement driver functions required by
258 * @flags: driver flags - see DM_FLAGS_...
259 * @acpi_ops: Advanced Configuration and Power Interface (ACPI) operations,
260 * allowing the device to add things to the ACPI tables passed to Linux
265 const struct udevice_id *of_match;
266 int (*bind)(struct udevice *dev);
267 int (*probe)(struct udevice *dev);
268 int (*remove)(struct udevice *dev);
269 int (*unbind)(struct udevice *dev);
270 int (*of_to_plat)(struct udevice *dev);
271 int (*child_post_bind)(struct udevice *dev);
272 int (*child_pre_probe)(struct udevice *dev);
273 int (*child_post_remove)(struct udevice *dev);
277 int per_child_plat_auto;
278 const void *ops; /* driver-specific operations */
280 #if CONFIG_IS_ENABLED(ACPIGEN)
281 struct acpi_ops *acpi_ops;
285 /* Declare a new U-Boot driver */
286 #define U_BOOT_DRIVER(__name) \
287 ll_entry_declare(struct driver, __name, driver)
289 /* Get a pointer to a given driver */
290 #define DM_GET_DRIVER(__name) \
291 ll_entry_get(struct driver, __name, driver)
294 * Declare a macro to state a alias for a driver name. This macro will
295 * produce no code but its information will be parsed by tools like
298 #define U_BOOT_DRIVER_ALIAS(__name, __alias)
301 * dev_get_plat() - Get the platform data for a device
303 * This checks that dev is not NULL, but no other checks for now
305 * @dev Device to check
306 * @return platform data, or NULL if none
308 void *dev_get_plat(const struct udevice *dev);
311 * dev_get_parent_plat() - Get the parent platform data for a device
313 * This checks that dev is not NULL, but no other checks for now
315 * @dev Device to check
316 * @return parent's platform data, or NULL if none
318 void *dev_get_parent_plat(const struct udevice *dev);
321 * dev_get_uclass_plat() - Get the uclass platform data for a device
323 * This checks that dev is not NULL, but no other checks for now
325 * @dev Device to check
326 * @return uclass's platform data, or NULL if none
328 void *dev_get_uclass_plat(const struct udevice *dev);
331 * dev_get_priv() - Get the private data for a device
333 * This checks that dev is not NULL, but no other checks for now
335 * @dev Device to check
336 * @return private data, or NULL if none
338 void *dev_get_priv(const struct udevice *dev);
341 * dev_get_parent_priv() - Get the parent private data for a device
343 * The parent private data is data stored in the device but owned by the
344 * parent. For example, a USB device may have parent data which contains
345 * information about how to talk to the device over USB.
347 * This checks that dev is not NULL, but no other checks for now
349 * @dev Device to check
350 * @return parent data, or NULL if none
352 void *dev_get_parent_priv(const struct udevice *dev);
355 * dev_get_uclass_priv() - Get the private uclass data for a device
357 * This checks that dev is not NULL, but no other checks for now
359 * @dev Device to check
360 * @return private uclass data for this device, or NULL if none
362 void *dev_get_uclass_priv(const struct udevice *dev);
365 * struct dev_get_parent() - Get the parent of a device
367 * @child: Child to check
368 * @return parent of child, or NULL if this is the root device
370 struct udevice *dev_get_parent(const struct udevice *child);
373 * dev_get_driver_data() - get the driver data used to bind a device
375 * When a device is bound using a device tree node, it matches a
376 * particular compatible string in struct udevice_id. This function
377 * returns the associated data value for that compatible string. This is
378 * the 'data' field in struct udevice_id.
380 * As an example, consider this structure:
381 * static const struct udevice_id tegra_i2c_ids[] = {
382 * { .compatible = "nvidia,tegra114-i2c", .data = TYPE_114 },
383 * { .compatible = "nvidia,tegra20-i2c", .data = TYPE_STD },
384 * { .compatible = "nvidia,tegra20-i2c-dvc", .data = TYPE_DVC },
388 * When driver model finds a driver for this it will store the 'data' value
389 * corresponding to the compatible string it matches. This function returns
390 * that value. This allows the driver to handle several variants of a device.
392 * For USB devices, this is the driver_info field in struct usb_device_id.
394 * @dev: Device to check
395 * @return driver data (0 if none is provided)
397 ulong dev_get_driver_data(const struct udevice *dev);
400 * dev_get_driver_ops() - get the device's driver's operations
402 * This checks that dev is not NULL, and returns the pointer to device's
403 * driver's operations.
405 * @dev: Device to check
406 * @return void pointer to driver's operations or NULL for NULL-dev or NULL-ops
408 const void *dev_get_driver_ops(const struct udevice *dev);
411 * device_get_uclass_id() - return the uclass ID of a device
413 * @dev: Device to check
414 * @return uclass ID for the device
416 enum uclass_id device_get_uclass_id(const struct udevice *dev);
419 * dev_get_uclass_name() - return the uclass name of a device
421 * This checks that dev is not NULL.
423 * @dev: Device to check
424 * @return pointer to the uclass name for the device
426 const char *dev_get_uclass_name(const struct udevice *dev);
429 * device_get_child() - Get the child of a device by index
431 * Returns the numbered child, 0 being the first. This does not use
432 * sequence numbers, only the natural order.
434 * @dev: Parent device to check
435 * @index: Child index
436 * @devp: Returns pointer to device
437 * @return 0 if OK, -ENODEV if no such device, other error if the device fails
440 int device_get_child(const struct udevice *parent, int index,
441 struct udevice **devp);
444 * device_get_child_count() - Get the available child count of a device
446 * Returns the number of children to a device.
448 * @parent: Parent device to check
450 int device_get_child_count(const struct udevice *parent);
453 * device_find_child_by_seq() - Find a child device based on a sequence
455 * This searches for a device with the given seq or req_seq.
457 * For seq, if an active device has this sequence it will be returned.
458 * If there is no such device then this will return -ENODEV.
460 * For req_seq, if a device (whether activated or not) has this req_seq
461 * value, that device will be returned. This is a strong indication that
462 * the device will receive that sequence when activated.
464 * @parent: Parent device
465 * @seq_or_req_seq: Sequence number to find (0=first)
466 * @find_req_seq: true to find req_seq, false to find seq
467 * @devp: Returns pointer to device (there is only one per for each seq).
468 * Set to NULL if none is found
469 * @return 0 if OK, -ve on error
471 int device_find_child_by_seq(const struct udevice *parent, int seq_or_req_seq,
472 bool find_req_seq, struct udevice **devp);
475 * device_get_child_by_seq() - Get a child device based on a sequence
477 * If an active device has this sequence it will be returned. If there is no
478 * such device then this will check for a device that is requesting this
481 * The device is probed to activate it ready for use.
483 * @parent: Parent device
484 * @seq: Sequence number to find (0=first)
485 * @devp: Returns pointer to device (there is only one per for each seq)
486 * Set to NULL if none is found
487 * @return 0 if OK, -ve on error
489 int device_get_child_by_seq(const struct udevice *parent, int seq,
490 struct udevice **devp);
493 * device_find_child_by_of_offset() - Find a child device based on FDT offset
495 * Locates a child device by its device tree offset.
497 * @parent: Parent device
498 * @of_offset: Device tree offset to find
499 * @devp: Returns pointer to device if found, otherwise this is set to NULL
500 * @return 0 if OK, -ve on error
502 int device_find_child_by_of_offset(const struct udevice *parent, int of_offset,
503 struct udevice **devp);
506 * device_get_child_by_of_offset() - Get a child device based on FDT offset
508 * Locates a child device by its device tree offset.
510 * The device is probed to activate it ready for use.
512 * @parent: Parent device
513 * @of_offset: Device tree offset to find
514 * @devp: Returns pointer to device if found, otherwise this is set to NULL
515 * @return 0 if OK, -ve on error
517 int device_get_child_by_of_offset(const struct udevice *parent, int of_offset,
518 struct udevice **devp);
521 * device_find_global_by_ofnode() - Get a device based on ofnode
523 * Locates a device by its device tree ofnode, searching globally throughout
524 * the all driver model devices.
526 * The device is NOT probed
528 * @node: Device tree ofnode to find
529 * @devp: Returns pointer to device if found, otherwise this is set to NULL
530 * @return 0 if OK, -ve on error
533 int device_find_global_by_ofnode(ofnode node, struct udevice **devp);
536 * device_get_global_by_ofnode() - Get a device based on ofnode
538 * Locates a device by its device tree ofnode, searching globally throughout
539 * the all driver model devices.
541 * The device is probed to activate it ready for use.
543 * @node: Device tree ofnode to find
544 * @devp: Returns pointer to device if found, otherwise this is set to NULL
545 * @return 0 if OK, -ve on error
547 int device_get_global_by_ofnode(ofnode node, struct udevice **devp);
550 * device_get_by_driver_info() - Get a device based on driver_info
552 * Locates a device by its struct driver_info, by using its reference which
553 * is updated during the bind process.
555 * The device is probed to activate it ready for use.
557 * @info: Struct driver_info
558 * @devp: Returns pointer to device if found, otherwise this is set to NULL
559 * @return 0 if OK, -ve on error
561 int device_get_by_driver_info(const struct driver_info *info,
562 struct udevice **devp);
565 * device_get_by_driver_info_idx() - Get a device based on driver_info index
567 * Locates a device by its struct driver_info, by using its index number which
568 * is written into the idx field of struct phandle_1_arg, etc.
570 * The device is probed to activate it ready for use.
572 * @idx: Index number of the driver_info structure (0=first)
573 * @devp: Returns pointer to device if found, otherwise this is set to NULL
574 * @return 0 if OK, -ve on error
576 int device_get_by_driver_info_idx(uint idx, struct udevice **devp);
579 * device_find_first_child() - Find the first child of a device
581 * @parent: Parent device to search
582 * @devp: Returns first child device, or NULL if none
585 int device_find_first_child(const struct udevice *parent,
586 struct udevice **devp);
589 * device_find_next_child() - Find the next child of a device
591 * @devp: Pointer to previous child device on entry. Returns pointer to next
592 * child device, or NULL if none
595 int device_find_next_child(struct udevice **devp);
598 * device_find_first_inactive_child() - Find the first inactive child
600 * This is used to locate an existing child of a device which is of a given
603 * The device is NOT probed
605 * @parent: Parent device to search
606 * @uclass_id: Uclass to look for
607 * @devp: Returns device found, if any
608 * @return 0 if found, else -ENODEV
610 int device_find_first_inactive_child(const struct udevice *parent,
611 enum uclass_id uclass_id,
612 struct udevice **devp);
615 * device_find_first_child_by_uclass() - Find the first child of a device in uc
617 * @parent: Parent device to search
618 * @uclass_id: Uclass to look for
619 * @devp: Returns first child device in that uclass, if any
620 * @return 0 if found, else -ENODEV
622 int device_find_first_child_by_uclass(const struct udevice *parent,
623 enum uclass_id uclass_id,
624 struct udevice **devp);
627 * device_find_child_by_name() - Find a child by device name
629 * @parent: Parent device to search
630 * @name: Name to look for
631 * @devp: Returns device found, if any
632 * @return 0 if found, else -ENODEV
634 int device_find_child_by_name(const struct udevice *parent, const char *name,
635 struct udevice **devp);
638 * device_first_child_ofdata_err() - Find the first child and reads 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 * @parent: Parent to check
644 * @devp: Returns child that was found, if any
645 * @return 0 on success, -ENODEV if no children, other -ve on error
647 int device_first_child_ofdata_err(struct udevice *parent,
648 struct udevice **devp);
651 * device_next_child_ofdata_err() - Find the next child and read its plat
653 * The of_to_plat() method is called on the child before it is returned,
654 * but the child is not probed.
656 * @devp: On entry, points to the previous child; on exit returns the child that
658 * @return 0 on success, -ENODEV if no children, other -ve on error
660 int device_next_child_ofdata_err(struct udevice **devp);
663 * device_first_child_err() - Get the first child of a device
665 * The device returned is probed if necessary, and ready for use
667 * @parent: Parent device to search
668 * @devp: Returns device found, if any
669 * @return 0 if found, -ENODEV if not, -ve error if device failed to probe
671 int device_first_child_err(struct udevice *parent, struct udevice **devp);
674 * device_next_child_err() - Get the next child of a parent device
676 * The device returned is probed if necessary, and ready for use
678 * @devp: On entry, pointer to device to lookup. On exit, returns pointer
679 * to the next sibling if no error occurred
680 * @return 0 if found, -ENODEV if not, -ve error if device failed to probe
682 int device_next_child_err(struct udevice **devp);
685 * device_has_children() - check if a device has any children
687 * @dev: Device to check
688 * @return true if the device has one or more children
690 bool device_has_children(const struct udevice *dev);
693 * device_has_active_children() - check if a device has any active children
695 * @dev: Device to check
696 * @return true if the device has one or more children and at least one of
697 * them is active (probed).
699 bool device_has_active_children(const struct udevice *dev);
702 * device_is_last_sibling() - check if a device is the last sibling
704 * This function can be useful for display purposes, when special action needs
705 * to be taken when displaying the last sibling. This can happen when a tree
706 * view of devices is being displayed.
708 * @dev: Device to check
709 * @return true if there are no more siblings after this one - i.e. is it
712 bool device_is_last_sibling(const struct udevice *dev);
715 * device_set_name() - set the name of a device
717 * This must be called in the device's bind() method and no later. Normally
718 * this is unnecessary but for probed devices which don't get a useful name
719 * this function can be helpful.
721 * The name is allocated and will be freed automatically when the device is
724 * @dev: Device to update
725 * @name: New name (this string is allocated new memory and attached to
727 * @return 0 if OK, -ENOMEM if there is not enough memory to allocate the
730 int device_set_name(struct udevice *dev, const char *name);
733 * device_set_name_alloced() - note that a device name is allocated
735 * This sets the DM_FLAG_NAME_ALLOCED flag for the device, so that when it is
736 * unbound the name will be freed. This avoids memory leaks.
738 * @dev: Device to update
740 void device_set_name_alloced(struct udevice *dev);
743 * device_is_compatible() - check if the device is compatible with the compat
745 * This allows to check whether the device is comaptible with the compat.
747 * @dev: udevice pointer for which compatible needs to be verified.
748 * @compat: Compatible string which needs to verified in the given
750 * @return true if OK, false if the compatible is not found
752 bool device_is_compatible(const struct udevice *dev, const char *compat);
755 * of_machine_is_compatible() - check if the machine is compatible with
758 * This allows to check whether the machine is comaptible with the compat.
760 * @compat: Compatible string which needs to verified
761 * @return true if OK, false if the compatible is not found
763 bool of_machine_is_compatible(const char *compat);
766 * dev_disable_by_path() - Disable a device given its device tree path
768 * @path: The device tree path identifying the device to be disabled
769 * @return 0 on success, -ve on error
771 int dev_disable_by_path(const char *path);
774 * dev_enable_by_path() - Enable a device given its device tree path
776 * @path: The device tree path identifying the device to be enabled
777 * @return 0 on success, -ve on error
779 int dev_enable_by_path(const char *path);
782 * device_is_on_pci_bus - Test if a device is on a PCI bus
784 * @dev: device to test
785 * @return: true if it is on a PCI bus, false otherwise
787 static inline bool device_is_on_pci_bus(const struct udevice *dev)
789 return dev->parent && device_get_uclass_id(dev->parent) == UCLASS_PCI;
793 * device_foreach_child_safe() - iterate through child devices safely
795 * This allows the @pos child to be removed in the loop if required.
797 * @pos: struct udevice * for the current device
798 * @next: struct udevice * for the next device
799 * @parent: parent device to scan
801 #define device_foreach_child_safe(pos, next, parent) \
802 list_for_each_entry_safe(pos, next, &parent->child_head, sibling_node)
805 * device_foreach_child() - iterate through child devices
807 * @pos: struct udevice * for the current device
808 * @parent: parent device to scan
810 #define device_foreach_child(pos, parent) \
811 list_for_each_entry(pos, &parent->child_head, sibling_node)
814 * device_foreach_child_of_to_plat() - iterate through children
816 * This stops when it gets an error, with @pos set to the device that failed to
819 * This creates a for() loop which works through the available children of
820 * a device in order from start to end. Device ofdata is read by calling
821 * device_of_to_plat() on each one. The devices are not probed.
823 * @pos: struct udevice * for the current device
824 * @parent: parent device to scan
826 #define device_foreach_child_of_to_plat(pos, parent) \
827 for (int _ret = device_first_child_ofdata_err(parent, &dev); !_ret; \
828 _ret = device_next_child_ofdata_err(&dev))
831 * device_foreach_child_probe() - iterate through children, probing them
833 * This creates a for() loop which works through the available children of
834 * a device in order from start to end. Devices are probed if necessary,
837 * This stops when it gets an error, with @pos set to the device that failed to
840 * @pos: struct udevice * for the current device
841 * @parent: parent device to scan
843 #define device_foreach_child_probe(pos, parent) \
844 for (int _ret = device_first_child_err(parent, &dev); !_ret; \
845 _ret = device_next_child_err(&dev))
848 * dm_scan_fdt_dev() - Bind child device in the device tree
850 * This handles device which have sub-nodes in the device tree. It scans all
851 * sub-nodes and binds drivers for each node where a driver can be found.
853 * If this is called prior to relocation, only pre-relocation devices will be
854 * bound (those marked with u-boot,dm-pre-reloc in the device tree, or where
855 * the driver has the DM_FLAG_PRE_RELOC flag set). Otherwise, all devices will
858 * @dev: Device to scan
859 * @return 0 if OK, -ve on error
861 int dm_scan_fdt_dev(struct udevice *dev);