u-boot dm驱动模型-udevice和driver
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/* SPDX-License-Identifier: GPL-2.0+ */ /* * Copyright (c) 2013 Google, Inc * * (C) Copyright 2012 * Pavel Herrmann <morpheus.ibis@gmail.com> * Marek Vasut <marex@denx.de> */#ifndef _DM_DEVICE_H #define _DM_DEVICE_H
#include <dm/ofnode.h> #include <dm/uclass-id.h> #include <fdtdec.h> #include <linker_lists.h> #include <linux/kernel.h> #include <linux/list.h> #include <linux/printk.h>
struct driver_info;
/* Driver is active (probed). Cleared when it is removed */ #define DM_FLAG_ACTIVATED (1 << 0)
/* DM is responsible for allocating and freeing plat */ #define DM_FLAG_ALLOC_PDATA (1 << 1)
/* DM should init this device prior to relocation */ #define DM_FLAG_PRE_RELOC (1 << 2)
/* DM is responsible for allocating and freeing parent_plat */ #define DM_FLAG_ALLOC_PARENT_PDATA (1 << 3)
/* DM is responsible for allocating and freeing uclass_plat */ #define DM_FLAG_ALLOC_UCLASS_PDATA (1 << 4)
/* Allocate driver private data on a DMA boundary */ #define DM_FLAG_ALLOC_PRIV_DMA (1 << 5)
/* Device is bound */ #define DM_FLAG_BOUND (1 << 6)
/* Device name is allocated and should be freed on unbind() */ #define DM_FLAG_NAME_ALLOCED (1 << 7)
/* Device has platform data provided by of-platdata */ #define DM_FLAG_OF_PLATDATA (1 << 8)
/* * Call driver remove function to stop currently active DMA transfers or * give DMA buffers back to the HW / controller. This may be needed for * some drivers to do some final stage cleanup before the OS is called * (U-Boot exit) */ #define DM_FLAG_ACTIVE_DMA (1 << 9)
/* * Call driver remove function to do some final configuration, before * U-Boot exits and the OS is started */ #define DM_FLAG_OS_PREPARE (1 << 10)
/* DM does not enable/disable the power domains corresponding to this device */ #define DM_FLAG_DEFAULT_PD_CTRL_OFF (1 << 11)
/* Driver plat has been read. Cleared when the device is removed */ #define DM_FLAG_PLATDATA_VALID (1 << 12)
/* * Device is removed without switching off its power domain. This might * be required, i. e. for serial console (debug) output when booting OS. */ #define DM_FLAG_LEAVE_PD_ON (1 << 13)
/* * Device is vital to the operation of other devices. It is possible to remove * removed this device after all regular devices are removed. This is useful * e.g. for clock, which need to be active during the device-removal phase. */ #define DM_FLAG_VITAL (1 << 14)
/* * One or multiple of these flags are passed to device_remove() so that * a selective device removal as specified by the remove-stage and the * driver flags can be done. * * DO NOT use these flags in your driver's @flags value... * use the above DM_FLAG_... values instead */ enum { /* Normal remove, remove all devices */ DM_REMOVE_NORMAL = 1 << 0,
/* Remove devices with active DMA */ DM_REMOVE_ACTIVE_DMA = DM_FLAG_ACTIVE_DMA,
/* Remove devices which need some final OS preparation steps */ DM_REMOVE_OS_PREPARE = DM_FLAG_OS_PREPARE,
/* Remove only devices that are not marked vital */ DM_REMOVE_NON_VITAL = DM_FLAG_VITAL,
/* Remove devices with any active flag */ DM_REMOVE_ACTIVE_ALL = DM_REMOVE_ACTIVE_DMA | DM_REMOVE_OS_PREPARE,
/* Don't power down any attached power domains */ DM_REMOVE_NO_PD = 1 << 1, };
/** * struct udevice - An instance of a driver * * This holds information about a device, which is a driver bound to a * particular port or peripheral (essentially a driver instance). * * A device will come into existence through a 'bind' call, either due to * a U_BOOT_DRVINFO() macro (in which case plat is non-NULL) or a node * in the device tree (in which case of_offset is >= 0). In the latter case * we translate the device tree information into plat in a function * implemented by the driver of_to_plat method (called just before the * probe method if the device has a device tree node. * * All three of plat, priv and uclass_priv can be allocated by the * driver, or you can use the auto members of struct driver and * struct uclass_driver to have driver model do this automatically. * * @driver: The driver used by this device * @name: Name of device, typically the FDT node name * @plat_: Configuration data for this device (do not access outside driver * model) * @parent_plat_: The parent bus's configuration data for this device (do not * access outside driver model) * @uclass_plat_: The uclass's configuration data for this device (do not access * outside driver model) * @driver_data: Driver data word for the entry that matched this device with * its driver * @parent: Parent of this device, or NULL for the top level device * @priv_: Private data for this device (do not access outside driver model) * @uclass: Pointer to uclass for this device * @uclass_priv_: The uclass's private data for this device (do not access * outside driver model) * @parent_priv_: The parent's private data for this device (do not access * outside driver model) * @uclass_node: Used by uclass to link its devices * @child_head: List of children of this device * @sibling_node: Next device in list of all devices * @flags_: Flags for this device DM_FLAG_... (do not access outside driver * model) * @seq_: Allocated sequence number for this device (-1 = none). This is set up * when the device is bound and is unique within the device's uclass. If the * device has an alias in the devicetree then that is used to set the sequence * number. Otherwise, the next available number is used. Sequence numbers are * used by certain commands that need device to be numbered (e.g. 'mmc dev'). * (do not access outside driver model) * @node_: Reference to device tree node for this device (do not access outside * driver model) * @devres_head: List of memory allocations associated with this device. * When CONFIG_DEVRES is enabled, devm_kmalloc() and friends will * add to this list. Memory so-allocated will be freed * automatically when the device is removed / unbound * @dma_offset: Offset between the physical address space (CPU's) and the * device's bus address space */ struct udevice { const struct driver *driver; const char *name; void *plat_; void *parent_plat_; void *uclass_plat_; ulong driver_data; struct udevice *parent; void *priv_; struct uclass *uclass; void *uclass_priv_; void *parent_priv_; struct list_head uclass_node; struct list_head child_head; struct list_head sibling_node; #if !CONFIG_IS_ENABLED(OF_PLATDATA_RT) u32 flags_; #endif int seq_; #if !CONFIG_IS_ENABLED(OF_PLATDATA) ofnode node_; #endif #ifdef CONFIG_DEVRES struct list_head devres_head; #endif #if CONFIG_IS_ENABLED(DM_DMA) ulong dma_offset; #endif };
/** * udevice_rt - runtime information set up by U-Boot * * This is only used with OF_PLATDATA_RT * * There is one of these for every udevice in the linker list, indexed by * the udevice_info idx value. * * @flags_: Flags for this device DM_FLAG_... (do not access outside driver * model) */ struct udevice_rt { u32 flags_; };
/* Maximum sequence number supported and associated string length */ #define DM_MAX_SEQ 999 #define DM_MAX_SEQ_STR 3
/* Returns the operations for a device */ #define device_get_ops(dev) (dev->driver->ops)
#if CONFIG_IS_ENABLED(OF_PLATDATA_RT) u32 dev_get_flags(const struct udevice *dev); void dev_or_flags(const struct udevice *dev, u32 or); void dev_bic_flags(const struct udevice *dev, u32 bic); #else static inline u32 dev_get_flags(const struct udevice *dev) { return dev->flags_; }
static inline void dev_or_flags(struct udevice *dev, u32 or) { dev->flags_ |= or; }
static inline void dev_bic_flags(struct udevice *dev, u32 bic) { dev->flags_ &= ~bic; } #endif /* OF_PLATDATA_RT */
/** * dev_ofnode() - get the DT node reference associated with a udevice * * @dev: device to check * @return reference of the the device's DT node */ static inline ofnode dev_ofnode(const struct udevice *dev) { #if !CONFIG_IS_ENABLED(OF_PLATDATA) return dev->node_; #else return ofnode_null(); #endif }
/* Returns non-zero if the device is active (probed and not removed) */ #define device_active(dev) (dev_get_flags(dev) & DM_FLAG_ACTIVATED)
#if CONFIG_IS_ENABLED(DM_DMA) #define dev_set_dma_offset(_dev, _offset) _dev->dma_offset = _offset #define dev_get_dma_offset(_dev) _dev->dma_offset #else #define dev_set_dma_offset(_dev, _offset) #define dev_get_dma_offset(_dev) 0 #endif
static inline int dev_of_offset(const struct udevice *dev) { #if !CONFIG_IS_ENABLED(OF_PLATDATA) return ofnode_to_offset(dev_ofnode(dev)); #else return -1; #endif }
static inline bool dev_has_ofnode(const struct udevice *dev) { #if !CONFIG_IS_ENABLED(OF_PLATDATA) return ofnode_valid(dev_ofnode(dev)); #else return false; #endif }
static inline void dev_set_ofnode(struct udevice *dev, ofnode node) { #if !CONFIG_IS_ENABLED(OF_PLATDATA) dev->node_ = node; #endif }
static inline int dev_seq(const struct udevice *dev) { return dev->seq_; }
/** * struct udevice_id - Lists the compatible strings supported by a driver * @compatible: Compatible string * @data: Data for this compatible string */ struct udevice_id { const char *compatible; ulong data; };
#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA) #define of_match_ptr(_ptr) (_ptr) #else #define of_match_ptr(_ptr) NULL #endif /* CONFIG_IS_ENABLED(OF_CONTROL) */
/** * struct driver - A driver for a feature or peripheral * * This holds methods for setting up a new device, and also removing it. * The device needs information to set itself up - this is provided either * by plat or a device tree node (which we find by looking up * matching compatible strings with of_match). * * Drivers all belong to a uclass, representing a class of devices of the * same type. Common elements of the drivers can be implemented in the uclass, * or the uclass can provide a consistent interface to the drivers within * it. * * @name: Device name * @id: Identifies the uclass we belong to * @of_match: List of compatible strings to match, and any identifying data * for each. * @bind: Called to bind a device to its driver * @probe: Called to probe a device, i.e. activate it * @remove: Called to remove a device, i.e. de-activate it * @unbind: Called to unbind a device from its driver * @of_to_plat: Called before probe to decode device tree data * @child_post_bind: Called after a new child has been bound * @child_pre_probe: Called before a child device is probed. The device has * memory allocated but it has not yet been probed. * @child_post_remove: Called after a child device is removed. The device * has memory allocated but its device_remove() method has been called. * @priv_auto: If non-zero this is the size of the private data * to be allocated in the device's ->priv pointer. If zero, then the driver * is responsible for allocating any data required. * @plat_auto: If non-zero this is the size of the * platform data to be allocated in the device's ->plat pointer. * This is typically only useful for device-tree-aware drivers (those with * an of_match), since drivers which use plat will have the data * provided in the U_BOOT_DRVINFO() instantiation. * @per_child_auto: Each device can hold private data owned by * its parent. If required this will be automatically allocated if this * value is non-zero. * @per_child_plat_auto: A bus likes to store information about * its children. If non-zero this is the size of this data, to be allocated * in the child's parent_plat pointer. * @ops: Driver-specific operations. This is typically a list of function * pointers defined by the driver, to implement driver functions required by * the uclass. * @flags: driver flags - see DM_FLAGS_... * @acpi_ops: Advanced Configuration and Power Interface (ACPI) operations, * allowing the device to add things to the ACPI tables passed to Linux */ struct driver { char *name; enum uclass_id id; const struct udevice_id *of_match; int (*bind)(struct udevice *dev); int (*probe)(struct udevice *dev); int (*remove)(struct udevice *dev); int (*unbind)(struct udevice *dev); int (*of_to_plat)(struct udevice *dev); int (*child_post_bind)(struct udevice *dev); int (*child_pre_probe)(struct udevice *dev); int (*child_post_remove)(struct udevice *dev); int priv_auto; int plat_auto; int per_child_auto; int per_child_plat_auto; const void *ops; /* driver-specific operations */ uint32_t flags; #if CONFIG_IS_ENABLED(ACPIGEN) struct acpi_ops *acpi_ops; #endif };
/* Declare a new U-Boot driver */ #define U_BOOT_DRIVER(__name) \ ll_entry_declare(struct driver, __name, driver)
/* Get a pointer to a given driver */ #define DM_DRIVER_GET(__name) \ ll_entry_get(struct driver, __name, driver)
/** * DM_DRIVER_REF() - Get a reference to a driver * * This is useful in data structures and code for referencing a driver at * build time. Before this is used, an extern U_BOOT_DRIVER() must have been * declared. * * For example: * * extern U_BOOT_DRIVER(sandbox_fixed_clock); * * struct driver *drvs[] = { * DM_DRIVER_REF(sandbox_fixed_clock), * }; * * @_name: Name of the driver. This must be a valid C identifier, used by the * linker_list * @returns struct driver * for the driver */ #define DM_DRIVER_REF(_name) \ ll_entry_ref(struct driver, _name, driver)
/** * Declare a macro to state a alias for a driver name. This macro will * produce no code but its information will be parsed by tools like * dtoc */ #define DM_DRIVER_ALIAS(__name, __alias)
/** * Declare a macro to indicate which phase of U-Boot this driver is fore. * * * This macro produces no code but its information will be parsed by dtoc. The * macro can be only be used once in a driver. Put it within the U_BOOT_DRIVER() * declaration, e.g.: * * U_BOOT_DRIVER(cpu) = { * .name = ... * ... * DM_PHASE(tpl) * }; */ #define DM_PHASE(_phase)
/** * Declare a macro to declare a header needed for a driver. Often the correct * header can be found automatically, but only for struct declarations. For * enums and #defines used in the driver declaration and declared in a different * header from the structs, this macro must be used. * * This macro produces no code but its information will be parsed by dtoc. The * macro can be used multiple times with different headers, for the same driver. * Put it within the U_BOOT_DRIVER() declaration, e.g.: * * U_BOOT_DRIVER(cpu) = { * .name = ... * ... * DM_HEADER(<asm/cpu.h>) * }; */ #define DM_HEADER(_hdr)
/** * dev_get_plat() - Get the platform data for a device * * This checks that dev is not NULL, but no other checks for now * * @dev Device to check * @return platform data, or NULL if none */ void *dev_get_plat(const struct udevice *dev);
/** * dev_get_parent_plat() - Get the parent platform data for a device * * This checks that dev is not NULL, but no other checks for now * * @dev Device to check * @return parent's platform data, or NULL if none */ void *dev_get_parent_plat(const struct udevice *dev);
/** * dev_get_uclass_plat() - Get the uclass platform data for a device * * This checks that dev is not NULL, but no other checks for now * * @dev Device to check * @return uclass's platform data, or NULL if none */ void *dev_get_uclass_plat(const struct udevice *dev);
/** * dev_get_priv() - Get the private data for a device * * This checks that dev is not NULL, but no other checks for now * * @dev Device to check * @return private data, or NULL if none */ void *dev_get_priv(const struct udevice *dev);
/** * dev_get_parent_priv() - Get the parent private data for a device * * The parent private data is data stored in the device but owned by the * parent. For example, a USB device may have parent data which contains * information about how to talk to the device over USB. * * This checks that dev is not NULL, but no other checks for now * * @dev Device to check * @return parent data, or NULL if none */ void *dev_get_parent_priv(const struct udevice *dev);
/** * dev_get_uclass_priv() - Get the private uclass data for a device * * This checks that dev is not NULL, but no other checks for now * * @dev Device to check * @return private uclass data for this device, or NULL if none */ void *dev_get_uclass_priv(const struct udevice *dev);
/** * struct dev_get_parent() - Get the parent of a device * * @child: Child to check * @return parent of child, or NULL if this is the root device */ struct udevice *dev_get_parent(const struct udevice *child);
/** * dev_get_driver_data() - get the driver data used to bind a device * * When a device is bound using a device tree node, it matches a * particular compatible string in struct udevice_id. This function * returns the associated data value for that compatible string. This is * the 'data' field in struct udevice_id. * * As an example, consider this structure: * static const struct udevice_id tegra_i2c_ids[] = { * { .compatible = "nvidia,tegra114-i2c", .data = TYPE_114 }, * { .compatible = "nvidia,tegra20-i2c", .data = TYPE_STD }, * { .compatible = "nvidia,tegra20-i2c-dvc", .data = TYPE_DVC }, * { } * }; * * When driver model finds a driver for this it will store the 'data' value * corresponding to the compatible string it matches. This function returns * that value. This allows the driver to handle several variants of a device. * * For USB devices, this is the driver_info field in struct usb_device_id. * * @dev: Device to check * @return driver data (0 if none is provided) */ ulong dev_get_driver_data(const struct udevice *dev);
/** * dev_get_driver_ops() - get the device's driver's operations * * This checks that dev is not NULL, and returns the pointer to device's * driver's operations. * * @dev: Device to check * @return void pointer to driver's operations or NULL for NULL-dev or NULL-ops */ const void *dev_get_driver_ops(const struct udevice *dev);
/** * device_get_uclass_id() - return the uclass ID of a device * * @dev: Device to check * @return uclass ID for the device */ enum uclass_id device_get_uclass_id(const struct udevice *dev);
/** * dev_get_uclass_name() - return the uclass name of a device * * This checks that dev is not NULL. * * @dev: Device to check * @return pointer to the uclass name for the device */ const char *dev_get_uclass_name(const struct udevice *dev);
/** * device_get_child() - Get the child of a device by index * * Returns the numbered child, 0 being the first. This does not use * sequence numbers, only the natural order. * * @dev: Parent device to check * @index: Child index * @devp: Returns pointer to device * @return 0 if OK, -ENODEV if no such device, other error if the device fails * to probe */ int device_get_child(const struct udevice *parent, int index, struct udevice **devp);
/** * device_get_child_count() - Get the available child count of a device * * Returns the number of children to a device. * * @parent: Parent device to check */ int device_get_child_count(const struct udevice *parent);
/** * device_find_child_by_seq() - Find a child device based on a sequence * * This searches for a device with the given seq. * * @parent: Parent device * @seq: Sequence number to find (0=first) * @devp: Returns pointer to device (there is only one per for each seq). * Set to NULL if none is found * @return 0 if OK, -ENODEV if not found */ int device_find_child_by_seq(const struct udevice *parent, int seq, struct udevice **devp);
/** * device_get_child_by_seq() - Get a child device based on a sequence * * If an active device has this sequence it will be returned. If there is no * such device then this will check for a device that is requesting this * sequence. * * The device is probed to activate it ready for use. * * @parent: Parent device * @seq: Sequence number to find (0=first) * @devp: Returns pointer to device (there is only one per for each seq) * Set to NULL if none is found * @return 0 if OK, -ve on error */ int device_get_child_by_seq(const struct udevice *parent, int seq, struct udevice **devp);
/** * device_find_child_by_of_offset() - Find a child device based on FDT offset * * Locates a child device by its device tree offset. * * @parent: Parent device * @of_offset: Device tree offset to find * @devp: Returns pointer to device if found, otherwise this is set to NULL * @return 0 if OK, -ve on error */ int device_find_child_by_of_offset(const struct udevice *parent, int of_offset, struct udevice **devp);
/** * device_get_child_by_of_offset() - Get a child device based on FDT offset * * Locates a child device by its device tree offset. * * The device is probed to activate it ready for use. * * @parent: Parent device * @of_offset: Device tree offset to find * @devp: Returns pointer to device if found, otherwise this is set to NULL * @return 0 if OK, -ve on error */ int device_get_child_by_of_offset(const struct udevice *parent, int of_offset, struct udevice **devp);
/** * device_find_global_by_ofnode() - Get a device based on ofnode * * Locates a device by its device tree ofnode, searching globally throughout * the all driver model devices. * * The device is NOT probed * * @node: Device tree ofnode to find * @devp: Returns pointer to device if found, otherwise this is set to NULL * @return 0 if OK, -ve on error */
int device_find_global_by_ofnode(ofnode node, struct udevice **devp);
/** * device_get_global_by_ofnode() - Get a device based on ofnode * * Locates a device by its device tree ofnode, searching globally throughout * the all driver model devices. * * The device is probed to activate it ready for use. * * @node: Device tree ofnode to find * @devp: Returns pointer to device if found, otherwise this is set to NULL * @return 0 if OK, -ve on error */ int device_get_global_by_ofnode(ofnode node, struct udevice **devp);
/** * device_get_by_ofplat_idx() - Get a device based on of-platdata index * * Locates a device by either its struct driver_info index, or its * struct udevice index. The latter is used with OF_PLATDATA_INST, since we have * a list of build-time instantiated struct udevice records, The former is used * with !OF_PLATDATA_INST since in that case we have a list of * struct driver_info records. * * The index number is written into the idx field of struct phandle_1_arg, etc. * It is the position of this driver_info/udevice in its linker list. * * The device is probed to activate it ready for use. * * @idx: Index number of the driver_info/udevice structure (0=first) * @devp: Returns pointer to device if found, otherwise this is set to NULL * @return 0 if OK, -ve on error */ int device_get_by_ofplat_idx(uint idx, struct udevice **devp);
/** * device_find_first_child() - Find the first child of a device * * @parent: Parent device to search * @devp: Returns first child device, or NULL if none * @return 0 */ int device_find_first_child(const struct udevice *parent, struct udevice **devp);
/** * device_find_next_child() - Find the next child of a device * * @devp: Pointer to previous child device on entry. Returns pointer to next * child device, or NULL if none * @return 0 */ int device_find_next_child(struct udevice **devp);
/** * device_find_first_inactive_child() - Find the first inactive child * * This is used to locate an existing child of a device which is of a given * uclass. * * The device is NOT probed * * @parent: Parent device to search * @uclass_id: Uclass to look for * @devp: Returns device found, if any * @return 0 if found, else -ENODEV */ int device_find_first_inactive_child(const struct udevice *parent, enum uclass_id uclass_id, struct udevice **devp);
/** * device_find_first_child_by_uclass() - Find the first child of a device in uc * * @parent: Parent device to search * @uclass_id: Uclass to look for * @devp: Returns first child device in that uclass, if any * @return 0 if found, else -ENODEV */ int device_find_first_child_by_uclass(const struct udevice *parent, enum uclass_id uclass_id, struct udevice **devp);
/** * device_find_child_by_name() - Find a child by device name * * @parent: Parent device to search * @name: Name to look for * @devp: Returns device found, if any * @return 0 if found, else -ENODEV */ int device_find_child_by_name(const struct udevice *parent, const char *name, struct udevice **devp);
/** * device_first_child_ofdata_err() - Find the first child and reads its plat * * The of_to_plat() method is called on the child before it is returned, * but the child is not probed. * * @parent: Parent to check * @devp: Returns child that was found, if any * @return 0 on success, -ENODEV if no children, other -ve on error */ int device_first_child_ofdata_err(struct udevice *parent, struct udevice **devp);
/* * device_next_child_ofdata_err() - Find the next child and read its plat * * The of_to_plat() method is called on the child before it is returned, * but the child is not probed. * * @devp: On entry, points to the previous child; on exit returns the child that * was found, if any * @return 0 on success, -ENODEV if no children, other -ve on error */ int device_next_child_ofdata_err(struct udevice **devp);
/** * device_first_child_err() - Get the first child of a device * * The device returned is probed if necessary, and ready for use * * @parent: Parent device to search * @devp: Returns device found, if any * @return 0 if found, -ENODEV if not, -ve error if device failed to probe */ int device_first_child_err(struct udevice *parent, struct udevice **devp);
/** * device_next_child_err() - Get the next child of a parent device * * The device returned is probed if necessary, and ready for use * * @devp: On entry, pointer to device to lookup. On exit, returns pointer * to the next sibling if no error occurred * @return 0 if found, -ENODEV if not, -ve error if device failed to probe */ int device_next_child_err(struct udevice **devp);
/** * device_has_children() - check if a device has any children * * @dev: Device to check * @return true if the device has one or more children */ bool device_has_children(const struct udevice *dev);
/** * device_has_active_children() - check if a device has any active children * * @dev: Device to check * @return true if the device has one or more children and at least one of * them is active (probed). */ bool device_has_active_children(const struct udevice *dev);
/** * device_is_last_sibling() - check if a device is the last sibling * * This function can be useful for display purposes, when special action needs * to be taken when displaying the last sibling. This can happen when a tree * view of devices is being displayed. * * @dev: Device to check * @return true if there are no more siblings after this one - i.e. is it * last in the list. */ bool device_is_last_sibling(const struct udevice *dev);
/** * device_set_name() - set the name of a device * * This must be called in the device's bind() method and no later. Normally * this is unnecessary but for probed devices which don't get a useful name * this function can be helpful. * * The name is allocated and will be freed automatically when the device is * unbound. * * @dev: Device to update * @name: New name (this string is allocated new memory and attached to * the device) * @return 0 if OK, -ENOMEM if there is not enough memory to allocate the * string */ int device_set_name(struct udevice *dev, const char *name);
/** * device_set_name_alloced() - note that a device name is allocated * * This sets the DM_FLAG_NAME_ALLOCED flag for the device, so that when it is * unbound the name will be freed. This avoids memory leaks. * * @dev: Device to update */ void device_set_name_alloced(struct udevice *dev);
/** * device_is_compatible() - check if the device is compatible with the compat * * This allows to check whether the device is comaptible with the compat. * * @dev: udevice pointer for which compatible needs to be verified. * @compat: Compatible string which needs to verified in the given * device * @return true if OK, false if the compatible is not found */ bool device_is_compatible(const struct udevice *dev, const char *compat);
/** * of_machine_is_compatible() - check if the machine is compatible with * the compat * * This allows to check whether the machine is comaptible with the compat. * * @compat: Compatible string which needs to verified * @return true if OK, false if the compatible is not found */ bool of_machine_is_compatible(const char *compat);
/** * dev_disable_by_path() - Disable a device given its device tree path * * @path: The device tree path identifying the device to be disabled * @return 0 on success, -ve on error */ int dev_disable_by_path(const char *path);
/** * dev_enable_by_path() - Enable a device given its device tree path * * @path: The device tree path identifying the device to be enabled * @return 0 on success, -ve on error */ int dev_enable_by_path(const char *path);
/** * device_is_on_pci_bus - Test if a device is on a PCI bus * * @dev: device to test * @return: true if it is on a PCI bus, false otherwise */ static inline bool device_is_on_pci_bus(const struct udevice *dev) { return dev->parent && device_get_uclass_id(dev->parent) == UCLASS_PCI; }
/** * device_foreach_child_safe() - iterate through child devices safely * * This allows the @pos child to be removed in the loop if required. * * @pos: struct udevice * for the current device * @next: struct udevice * for the next device * @parent: parent device to scan */ #define device_foreach_child_safe(pos, next, parent) \ list_for_each_entry_safe(pos, next, &parent->child_head, sibling_node)
/** * device_foreach_child() - iterate through child devices * * @pos: struct udevice * for the current device * @parent: parent device to scan */ #define device_foreach_child(pos, parent) \ list_for_each_entry(pos, &parent->child_head, sibling_node)
/** * device_foreach_child_of_to_plat() - iterate through children * * This stops when it gets an error, with @pos set to the device that failed to * read ofdata.
* This creates a for() loop which works through the available children of * a device in order from start to end. Device ofdata is read by calling * device_of_to_plat() on each one. The devices are not probed. * * @pos: struct udevice * for the current device * @parent: parent device to scan */ #define device_foreach_child_of_to_plat(pos, parent) \ for (int _ret = device_first_child_ofdata_err(parent, &dev); !_ret; \ _ret = device_next_child_ofdata_err(&dev))
/** * device_foreach_child_probe() - iterate through children, probing them * * This creates a for() loop which works through the available children of * a device in order from start to end. Devices are probed if necessary, * and ready for use. * * This stops when it gets an error, with @pos set to the device that failed to * probe * * @pos: struct udevice * for the current device * @parent: parent device to scan */ #define device_foreach_child_probe(pos, parent) \ for (int _ret = device_first_child_err(parent, &dev); !_ret; \ _ret = device_next_child_err(&dev))
/** * dm_scan_fdt_dev() - Bind child device in the device tree * * This handles device which have sub-nodes in the device tree. It scans all * sub-nodes and binds drivers for each node where a driver can be found. * * If this is called prior to relocation, only pre-relocation devices will be * bound (those marked with u-boot,dm-pre-reloc in the device tree, or where * the driver has the DM_FLAG_PRE_RELOC flag set). Otherwise, all devices will * be bound. * * @dev: Device to scan * @return 0 if OK, -ve on error */ int dm_scan_fdt_dev(struct udevice *dev);
#endif
标签：dm,struct,driver,boot,dev,udevice,child,device 来源： https://www.cnblogs.com/liujunhuasd/p/15915612.html