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of/reconfig: Add OF_DYNAMIC notifier for platform_bus_type 

Add OF notifier handler needed for creating/destroying platform devices
according to dynamic runtime changes in the DT live tree.

Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
Signed-off-by: Grant Likely <grant.likely@linaro.org>
This commit is contained in:
Pantelis Antoniou 2014-10-28 22:36:01 +02:00 committed by Grant Likely
parent f5242e5a88
commit 801d728c10
3 changed files with 62 additions and 0 deletions
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1
drivers/base/platform.c
View File

@ -1006,6 +1006,7 @@ int __init platform_bus_init(void)
error = bus_register(&platform_bus_type);
if (error)
device_unregister(&platform_bus);
of_platform_register_reconfig_notifier();
return error;
}

55
drivers/of/platform.c
View File

@ -550,4 +550,59 @@ void of_platform_depopulate(struct device *parent)
}
EXPORT_SYMBOL_GPL(of_platform_depopulate);
#ifdef CONFIG_OF_DYNAMIC
static int of_platform_notify(struct notifier_block *nb,
unsigned long action, void *arg)
{
struct of_reconfig_data *rd = arg;
struct platform_device *pdev_parent, *pdev;
bool children_left;
switch (of_reconfig_get_state_change(action, rd)) {
case OF_RECONFIG_CHANGE_ADD:
/* verify that the parent is a bus */
if (!of_node_check_flag(rd->dn->parent, OF_POPULATED_BUS))
return NOTIFY_OK; /* not for us */
/* pdev_parent may be NULL when no bus platform device */
pdev_parent = of_find_device_by_node(rd->dn->parent);
pdev = of_platform_device_create(rd->dn, NULL,
pdev_parent ? &pdev_parent->dev : NULL);
of_dev_put(pdev_parent);
if (pdev == NULL) {
pr_err("%s: failed to create for '%s'\n",
__func__, rd->dn->full_name);
/* of_platform_device_create tosses the error code */
return notifier_from_errno(-EINVAL);
}
break;
case OF_RECONFIG_CHANGE_REMOVE:
/* find our device by node */
pdev = of_find_device_by_node(rd->dn);
if (pdev == NULL)
return NOTIFY_OK; /* no? not meant for us */
/* unregister takes one ref away */
of_platform_device_destroy(&pdev->dev, &children_left);
/* and put the reference of the find */
of_dev_put(pdev);
break;
}
return NOTIFY_OK;
}
static struct notifier_block platform_of_notifier = {
.notifier_call = of_platform_notify,
};
void of_platform_register_reconfig_notifier(void)
{
WARN_ON(of_reconfig_notifier_register(&platform_of_notifier));
}
#endif /* CONFIG_OF_DYNAMIC */
#endif /* CONFIG_OF_ADDRESS */

6
include/linux/of_platform.h
View File

@ -84,4 +84,10 @@ static inline int of_platform_populate(struct device_node *root,
static inline void of_platform_depopulate(struct device *parent) { }
#endif
#ifdef CONFIG_OF_DYNAMIC
extern void of_platform_register_reconfig_notifier(void);
#else
static inline void of_platform_register_reconfig_notifier(void) { }
#endif
#endif /* _LINUX_OF_PLATFORM_H */