include/dm/device.h

/**
 * 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 platdata 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: Identiies 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
 * @ofdata_to_platdata: 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_alloc_size: 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.
 * @platdata_auto_alloc_size: If non-zero this is the size of the
 * platform data to be allocated in the device's ->platdata pointer.
 * This is typically only useful for device-tree-aware drivers (those with
 * an of_match), since drivers which use platdata will have the data
 * provided in the U_BOOT_DEVICE() instantiation.
 * @per_child_auto_alloc_size: 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_platdata_auto_alloc_size: 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_platdata 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_...
 */
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 (*ofdata_to_platdata)(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_alloc_size;
 int platdata_auto_alloc_size;
 int per_child_auto_alloc_size;
 int per_child_platdata_auto_alloc_size;
 const void *ops; /* driver-specific operations */
 uint32_t flags;
};