c6e126de43
In "Device Tree powered" systems, platform devices are usually massively populated with of_platform_populate() call, executed at some level of initcalls, either by generic architecture or by platform-specific code. There are situations though where certain devices must be created (and bound with drivers) before all the others. This presents a challenge, as devices created explicitly would be created again by of_platform_populate(). This patch tries to solve that issue in a generic way, adding a "populated" flag for a DT node description. Subsequent of_platform_populate() will skip such nodes (and its children) in a similar way to the non-available ones. This patch also adds of_platform_depopulate() as an operation complementary to the _populate() one. It removes a platform or an amba device populated from the Device Tree, together with its all children (leaving, however, devices without associated of_node untouched) clearing the "populated" flag on the way. Signed-off-by: Pawel Moll <pawel.moll@arm.com> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Grant Likely <grant.likely@linaro.org>
91 lines
3.1 KiB
C
91 lines
3.1 KiB
C
#ifndef _LINUX_OF_PLATFORM_H
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#define _LINUX_OF_PLATFORM_H
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/*
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* Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
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* <benh@kernel.crashing.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <linux/device.h>
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#include <linux/mod_devicetable.h>
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#include <linux/pm.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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/**
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* struct of_dev_auxdata - lookup table entry for device names & platform_data
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* @compatible: compatible value of node to match against node
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* @phys_addr: Start address of registers to match against node
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* @name: Name to assign for matching nodes
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* @platform_data: platform_data to assign for matching nodes
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*
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* This lookup table allows the caller of of_platform_populate() to override
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* the names of devices when creating devices from the device tree. The table
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* should be terminated with an empty entry. It also allows the platform_data
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* pointer to be set.
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*
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* The reason for this functionality is that some Linux infrastructure uses
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* the device name to look up a specific device, but the Linux-specific names
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* are not encoded into the device tree, so the kernel needs to provide specific
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* values.
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*
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* Note: Using an auxdata lookup table should be considered a last resort when
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* converting a platform to use the DT. Normally the automatically generated
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* device name will not matter, and drivers should obtain data from the device
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* node instead of from an anonymouns platform_data pointer.
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*/
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struct of_dev_auxdata {
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char *compatible;
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resource_size_t phys_addr;
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char *name;
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void *platform_data;
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};
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/* Macro to simplify populating a lookup table */
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#define OF_DEV_AUXDATA(_compat,_phys,_name,_pdata) \
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{ .compatible = _compat, .phys_addr = _phys, .name = _name, \
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.platform_data = _pdata }
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extern const struct of_device_id of_default_bus_match_table[];
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/* Platform drivers register/unregister */
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extern struct platform_device *of_device_alloc(struct device_node *np,
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const char *bus_id,
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struct device *parent);
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extern struct platform_device *of_find_device_by_node(struct device_node *np);
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/* Platform devices and busses creation */
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extern struct platform_device *of_platform_device_create(struct device_node *np,
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const char *bus_id,
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struct device *parent);
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extern int of_platform_bus_probe(struct device_node *root,
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const struct of_device_id *matches,
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struct device *parent);
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#ifdef CONFIG_OF_ADDRESS
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extern int of_platform_populate(struct device_node *root,
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const struct of_device_id *matches,
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const struct of_dev_auxdata *lookup,
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struct device *parent);
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extern int of_platform_depopulate(struct device *parent);
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#else
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static inline int of_platform_populate(struct device_node *root,
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const struct of_device_id *matches,
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const struct of_dev_auxdata *lookup,
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struct device *parent)
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{
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return -ENODEV;
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}
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static inline int of_platform_depopulate(struct device *parent)
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{
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return -ENODEV;
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}
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#endif
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#endif /* _LINUX_OF_PLATFORM_H */
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