mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-20 17:08:52 +09:00
![Anatolij Gustschin](/assets/img/avatar_default.png)
In various cases a power domain must stay enabled after device
removal when booting OS (i.e. serial debug console or display).
Add a flag to selectively skip switching off a power domain.
Fixes: 52edfed65d
("dm: core: device: switch off power domain after device removal")
Signed-off-by: Anatolij Gustschin <agust@denx.de>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Tested-by: Guillaume La Roque <glaroque@baylibre.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
812 lines
26 KiB
C
812 lines
26 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (c) 2013 Google, Inc
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*
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* (C) Copyright 2012
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* Pavel Herrmann <morpheus.ibis@gmail.com>
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* Marek Vasut <marex@denx.de>
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*/
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#ifndef _DM_DEVICE_H
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#define _DM_DEVICE_H
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#include <dm/ofnode.h>
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#include <dm/uclass-id.h>
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#include <fdtdec.h>
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#include <linker_lists.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/printk.h>
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struct driver_info;
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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 (1 << 1)
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/* DM should init this device prior to relocation */
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#define DM_FLAG_PRE_RELOC (1 << 2)
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/* DM is responsible for allocating and freeing parent_platdata */
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#define DM_FLAG_ALLOC_PARENT_PDATA (1 << 3)
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/* DM is responsible for allocating and freeing uclass_platdata */
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#define DM_FLAG_ALLOC_UCLASS_PDATA (1 << 4)
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/* Allocate driver private data on a DMA boundary */
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#define DM_FLAG_ALLOC_PRIV_DMA (1 << 5)
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/* Device is bound */
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#define DM_FLAG_BOUND (1 << 6)
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/* Device name is allocated and should be freed on unbind() */
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#define DM_FLAG_NAME_ALLOCED (1 << 7)
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/* Device has platform data provided by of-platdata */
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#define DM_FLAG_OF_PLATDATA (1 << 8)
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/*
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* Call driver remove function to stop currently active DMA transfers or
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* give DMA buffers back to the HW / controller. This may be needed for
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* some drivers to do some final stage cleanup before the OS is called
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* (U-Boot exit)
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*/
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#define DM_FLAG_ACTIVE_DMA (1 << 9)
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/*
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* Call driver remove function to do some final configuration, before
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* U-Boot exits and the OS is started
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*/
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#define DM_FLAG_OS_PREPARE (1 << 10)
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/* DM does not enable/disable the power domains corresponding to this device */
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#define DM_FLAG_DEFAULT_PD_CTRL_OFF (1 << 11)
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/* Driver platdata has been read. Cleared when the device is removed */
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#define DM_FLAG_PLATDATA_VALID (1 << 12)
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/*
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* Device is removed without switching off its power domain. This might
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* be required, i. e. for serial console (debug) output when booting OS.
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*/
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#define DM_FLAG_REMOVE_WITH_PD_ON (1 << 13)
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/*
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* One or multiple of these flags are passed to device_remove() so that
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* a selective device removal as specified by the remove-stage and the
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* driver flags can be done.
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*/
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enum {
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/* Normal remove, remove all devices */
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DM_REMOVE_NORMAL = 1 << 0,
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/* Remove devices with active DMA */
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DM_REMOVE_ACTIVE_DMA = DM_FLAG_ACTIVE_DMA,
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/* Remove devices which need some final OS preparation steps */
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DM_REMOVE_OS_PREPARE = DM_FLAG_OS_PREPARE,
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/* Add more use cases here */
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/* Remove devices with any active flag */
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DM_REMOVE_ACTIVE_ALL = DM_REMOVE_ACTIVE_DMA | DM_REMOVE_OS_PREPARE,
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};
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/**
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* struct udevice - An instance of a driver
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*
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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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*
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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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*
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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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*
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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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* @parent_platdata: The parent bus's configuration data for this device
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* @uclass_platdata: The uclass's configuration data for this device
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* @node: Reference to device tree node for this device
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* @driver_data: Driver data word for the entry that matched this device with
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* its driver
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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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* @parent_priv: The parent'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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* @req_seq: Requested sequence number for this device (-1 = any)
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* @seq: Allocated sequence number for this device (-1 = none). This is set up
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* when the device is probed and will be unique within the device's uclass.
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* @devres_head: List of memory allocations associated with this device.
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* When CONFIG_DEVRES is enabled, devm_kmalloc() and friends will
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* add to this list. Memory so-allocated will be freed
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* automatically when the device is removed / unbound
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*/
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struct udevice {
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const struct driver *driver;
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const char *name;
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void *platdata;
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void *parent_platdata;
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void *uclass_platdata;
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ofnode node;
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ulong driver_data;
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struct udevice *parent;
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void *priv;
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struct uclass *uclass;
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void *uclass_priv;
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void *parent_priv;
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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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uint32_t flags;
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int req_seq;
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int seq;
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#ifdef CONFIG_DEVRES
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struct list_head devres_head;
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#endif
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};
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/* Maximum sequence number supported */
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#define DM_MAX_SEQ 999
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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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static inline int dev_of_offset(const struct udevice *dev)
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{
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return ofnode_to_offset(dev->node);
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}
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static inline void dev_set_of_offset(struct udevice *dev, int of_offset)
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{
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dev->node = offset_to_ofnode(of_offset);
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}
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static inline bool dev_has_of_node(struct udevice *dev)
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{
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return ofnode_valid(dev->node);
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}
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/**
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* struct udevice_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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*/
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struct udevice_id {
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const char *compatible;
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ulong data;
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};
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#if CONFIG_IS_ENABLED(OF_CONTROL)
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#define of_match_ptr(_ptr) (_ptr)
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#else
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#define of_match_ptr(_ptr) NULL
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#endif /* CONFIG_IS_ENABLED(OF_CONTROL) */
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/**
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* struct driver - A driver for a feature or peripheral
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*
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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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*
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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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* it.
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*
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* @name: Device name
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* @id: Identifies 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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* for each.
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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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* @child_post_bind: Called after a new child has been bound
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* @child_pre_probe: Called before a child device is probed. The device has
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* memory allocated but it has not yet been probed.
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* @child_post_remove: Called after a child device is removed. The device
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* has memory allocated but its device_remove() method has been called.
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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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* @per_child_auto_alloc_size: Each device can hold private data owned by
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* its parent. If required this will be automatically allocated if this
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* value is non-zero.
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* @per_child_platdata_auto_alloc_size: A bus likes to store information about
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* its children. If non-zero this is the size of this data, to be allocated
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* in the child's parent_platdata pointer.
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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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* the uclass.
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* @flags: driver flags - see DM_FLAGS_...
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*/
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struct driver {
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char *name;
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enum uclass_id id;
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const struct udevice_id *of_match;
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int (*bind)(struct udevice *dev);
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int (*probe)(struct udevice *dev);
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int (*remove)(struct udevice *dev);
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int (*unbind)(struct udevice *dev);
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int (*ofdata_to_platdata)(struct udevice *dev);
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int (*child_post_bind)(struct udevice *dev);
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int (*child_pre_probe)(struct udevice *dev);
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int (*child_post_remove)(struct udevice *dev);
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int priv_auto_alloc_size;
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int platdata_auto_alloc_size;
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int per_child_auto_alloc_size;
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int per_child_platdata_auto_alloc_size;
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const void *ops; /* driver-specific operations */
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uint32_t flags;
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};
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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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/* Get a pointer to a given driver */
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#define DM_GET_DRIVER(__name) \
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ll_entry_get(struct driver, __name, driver)
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/**
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* dev_get_platdata() - Get the platform data for a device
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*
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* This checks that dev is not NULL, but no other checks for now
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*
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* @dev Device to check
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* @return platform data, or NULL if none
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*/
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void *dev_get_platdata(const struct udevice *dev);
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/**
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* dev_get_parent_platdata() - Get the parent platform data for a device
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*
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* This checks that dev is not NULL, but no other checks for now
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*
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* @dev Device to check
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* @return parent's platform data, or NULL if none
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*/
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void *dev_get_parent_platdata(const struct udevice *dev);
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/**
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* dev_get_uclass_platdata() - Get the uclass platform data for a device
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*
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* This checks that dev is not NULL, but no other checks for now
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*
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* @dev Device to check
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* @return uclass's platform data, or NULL if none
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*/
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void *dev_get_uclass_platdata(const struct udevice *dev);
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/**
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* dev_get_priv() - Get the private data for a device
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*
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* This checks that dev is not NULL, but no other checks for now
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*
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* @dev Device to check
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* @return private data, or NULL if none
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*/
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void *dev_get_priv(const struct udevice *dev);
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/**
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* dev_get_parent_priv() - Get the parent private data for a device
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*
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* The parent private data is data stored in the device but owned by the
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* parent. For example, a USB device may have parent data which contains
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* information about how to talk to the device over USB.
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*
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* This checks that dev is not NULL, but no other checks for now
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*
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* @dev Device to check
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* @return parent data, or NULL if none
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*/
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void *dev_get_parent_priv(const struct udevice *dev);
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/**
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* dev_get_uclass_priv() - Get the private uclass data for a device
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*
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* This checks that dev is not NULL, but no other checks for now
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*
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* @dev Device to check
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* @return private uclass data for this device, or NULL if none
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*/
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void *dev_get_uclass_priv(const struct udevice *dev);
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/**
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* struct dev_get_parent() - Get the parent of a device
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*
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* @child: Child to check
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* @return parent of child, or NULL if this is the root device
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*/
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struct udevice *dev_get_parent(const struct udevice *child);
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/**
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* dev_get_driver_data() - get the driver data used to bind a device
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*
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* When a device is bound using a device tree node, it matches a
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* particular compatible string in struct udevice_id. This function
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* returns the associated data value for that compatible string. This is
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* the 'data' field in struct udevice_id.
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*
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* As an example, consider this structure:
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* static const struct udevice_id tegra_i2c_ids[] = {
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* { .compatible = "nvidia,tegra114-i2c", .data = TYPE_114 },
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* { .compatible = "nvidia,tegra20-i2c", .data = TYPE_STD },
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* { .compatible = "nvidia,tegra20-i2c-dvc", .data = TYPE_DVC },
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* { }
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* };
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*
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* When driver model finds a driver for this it will store the 'data' value
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* corresponding to the compatible string it matches. This function returns
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* that value. This allows the driver to handle several variants of a device.
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*
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* For USB devices, this is the driver_info field in struct usb_device_id.
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*
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* @dev: Device to check
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* @return driver data (0 if none is provided)
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*/
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ulong dev_get_driver_data(const struct udevice *dev);
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/**
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* dev_get_driver_ops() - get the device's driver's operations
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*
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* This checks that dev is not NULL, and returns the pointer to device's
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* driver's operations.
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*
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* @dev: Device to check
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* @return void pointer to driver's operations or NULL for NULL-dev or NULL-ops
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*/
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const void *dev_get_driver_ops(const struct udevice *dev);
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/**
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* device_get_uclass_id() - return the uclass ID of a device
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*
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* @dev: Device to check
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* @return uclass ID for the device
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*/
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enum uclass_id device_get_uclass_id(const struct udevice *dev);
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/**
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* dev_get_uclass_name() - return the uclass name of a device
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*
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* This checks that dev is not NULL.
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*
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* @dev: Device to check
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* @return pointer to the uclass name for the device
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*/
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const char *dev_get_uclass_name(const struct udevice *dev);
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/**
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* device_get_child() - Get the child of a device by index
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*
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* Returns the numbered child, 0 being the first. This does not use
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* sequence numbers, only the natural order.
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*
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* @dev: Parent device to check
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* @index: Child index
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* @devp: Returns pointer to device
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* @return 0 if OK, -ENODEV if no such device, other error if the device fails
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* to probe
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*/
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int device_get_child(const struct udevice *parent, int index,
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struct udevice **devp);
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/**
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* device_get_child_count() - Get the available child count of a device
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*
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* Returns the number of children to a device.
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*
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* @parent: Parent device to check
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*/
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int device_get_child_count(const struct udevice *parent);
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/**
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* device_find_child_by_seq() - Find a child device based on a sequence
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*
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* This searches for a device with the given seq or req_seq.
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*
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* For seq, if an active device has this sequence it will be returned.
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* If there is no such device then this will return -ENODEV.
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*
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* For req_seq, if a device (whether activated or not) has this req_seq
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* value, that device will be returned. This is a strong indication that
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* the device will receive that sequence when activated.
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*
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* @parent: Parent device
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* @seq_or_req_seq: Sequence number to find (0=first)
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* @find_req_seq: true to find req_seq, false to find seq
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* @devp: Returns pointer to device (there is only one per for each seq).
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* Set to NULL if none is found
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* @return 0 if OK, -ve on error
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*/
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int device_find_child_by_seq(const struct udevice *parent, int seq_or_req_seq,
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bool find_req_seq, struct udevice **devp);
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/**
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* device_get_child_by_seq() - Get a child device based on a sequence
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*
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* If an active device has this sequence it will be returned. If there is no
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* such device then this will check for a device that is requesting this
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* sequence.
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*
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* The device is probed to activate it ready for use.
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*
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* @parent: Parent device
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* @seq: Sequence number to find (0=first)
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* @devp: Returns pointer to device (there is only one per for each seq)
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* Set to NULL if none is found
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* @return 0 if OK, -ve on error
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*/
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int device_get_child_by_seq(const struct udevice *parent, int seq,
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struct udevice **devp);
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/**
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* device_find_child_by_of_offset() - Find a child device based on FDT offset
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|
*
|
|
* 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_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 platdata
|
|
*
|
|
* The ofdata_to_platdata() 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 platdata
|
|
*
|
|
* The ofdata_to_platdata() 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 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_ofdata_to_platdata() - 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_ofdata_to_platdata() on each one. The devices are not probed.
|
|
*
|
|
* @pos: struct udevice * for the current device
|
|
* @parent: parent device to scan
|
|
*/
|
|
#define device_foreach_child_ofdata_to_platdata(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 a 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
|