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* Copyright (c) 2013 Google, Inc
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* Pavel Herrmann <morpheus.ibis@gmail.com>
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* Marek Vasut <marex@denx.de>
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* SPDX-License-Identifier: GPL-2.0+
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#include <dm/uclass-id.h>
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#include <linker_lists.h>
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#include <linux/list.h>
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/* Driver is active (probed). Cleared when it is removed */
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#define DM_FLAG_ACTIVATED (1 << 0)
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/* DM is responsible for allocating and freeing platdata */
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#define DM_FLAG_ALLOC_PDATA (2 << 0)
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* struct device - An instance of a driver
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* This holds information about a device, which is a driver bound to a
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* particular port or peripheral (essentially a driver instance).
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* A device will come into existence through a 'bind' call, either due to
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* a U_BOOT_DEVICE() macro (in which case platdata is non-NULL) or a node
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* in the device tree (in which case of_offset is >= 0). In the latter case
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* we translate the device tree information into platdata in a function
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* implemented by the driver ofdata_to_platdata method (called just before the
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* probe method if the device has a device tree node.
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* All three of platdata, priv and uclass_priv can be allocated by the
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* driver, or you can use the auto_alloc_size members of struct driver and
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* struct uclass_driver to have driver model do this automatically.
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* @driver: The driver used by this device
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* @name: Name of device, typically the FDT node name
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* @platdata: Configuration data for this device
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* @of_offset: Device tree node offset for this device (- for none)
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* @parent: Parent of this device, or NULL for the top level device
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* @priv: Private data for this device
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* @uclass: Pointer to uclass for this device
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* @uclass_priv: The uclass's private data for this device
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* @uclass_node: Used by uclass to link its devices
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* @child_head: List of children of this device
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* @sibling_node: Next device in list of all devices
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* @flags: Flags for this device DM_FLAG_...
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struct driver *driver;
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struct device *parent;
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struct uclass *uclass;
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struct list_head uclass_node;
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struct list_head child_head;
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struct list_head sibling_node;
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/* Returns the operations for a device */
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#define device_get_ops(dev) (dev->driver->ops)
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/* Returns non-zero if the device is active (probed and not removed) */
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#define device_active(dev) ((dev)->flags & DM_FLAG_ACTIVATED)
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* struct device_id - Lists the compatible strings supported by a driver
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* @compatible: Compatible string
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* @data: Data for this compatible string
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const char *compatible;
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* struct driver - A driver for a feature or peripheral
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* This holds methods for setting up a new device, and also removing it.
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* The device needs information to set itself up - this is provided either
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* by platdata or a device tree node (which we find by looking up
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* matching compatible strings with of_match).
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* Drivers all belong to a uclass, representing a class of devices of the
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* same type. Common elements of the drivers can be implemented in the uclass,
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* or the uclass can provide a consistent interface to the drivers within
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* @id: Identiies the uclass we belong to
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* @of_match: List of compatible strings to match, and any identifying data
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* @bind: Called to bind a device to its driver
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* @probe: Called to probe a device, i.e. activate it
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* @remove: Called to remove a device, i.e. de-activate it
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* @unbind: Called to unbind a device from its driver
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* @ofdata_to_platdata: Called before probe to decode device tree data
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* @priv_auto_alloc_size: If non-zero this is the size of the private data
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* to be allocated in the device's ->priv pointer. If zero, then the driver
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* is responsible for allocating any data required.
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* @platdata_auto_alloc_size: If non-zero this is the size of the
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* platform data to be allocated in the device's ->platdata pointer.
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* This is typically only useful for device-tree-aware drivers (those with
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* an of_match), since drivers which use platdata will have the data
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* provided in the U_BOOT_DEVICE() instantiation.
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* ops: Driver-specific operations. This is typically a list of function
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* pointers defined by the driver, to implement driver functions required by
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const struct device_id *of_match;
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int (*bind)(struct device *dev);
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int (*probe)(struct device *dev);
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int (*remove)(struct device *dev);
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int (*unbind)(struct device *dev);
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int (*ofdata_to_platdata)(struct device *dev);
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int priv_auto_alloc_size;
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int platdata_auto_alloc_size;
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const void *ops; /* driver-specific operations */
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/* Declare a new U-Boot driver */
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#define U_BOOT_DRIVER(__name) \
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ll_entry_declare(struct driver, __name, driver)
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* dev_get_platdata() - Get the platform data for a device
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* This checks that dev is not NULL, but no other checks for now
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* @dev Device to check
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* @return platform data, or NULL if none
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void *dev_get_platdata(struct device *dev);
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* dev_get_priv() - Get the private data for a device
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* This checks that dev is not NULL, but no other checks for now
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* @dev Device to check
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* @return private data, or NULL if none
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void *dev_get_priv(struct device *dev);