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dm: Add child_pre_probe() and child_post_remove() methods

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Some devices (particularly bus devices) must track their children, knowing
when a new child is added so that it can be set up for communication on the
bus.

Add a child_pre_probe() method to provide this feature, and a corresponding
child_post_remove() method.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2014-07-23 06:55:21 -06:00
parent e59f458de6
commit a327dee0f4
5 changed files with 160 additions and 2 deletions
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16
drivers/core/device.c
View file

@ -291,6 +291,12 @@ int device_probe(struct udevice *dev)
}
dev->seq = seq;
if (dev->parent && dev->parent->driver->child_pre_probe) {
ret = dev->parent->driver->child_pre_probe(dev);
if (ret)
goto fail;
}
if (drv->ofdata_to_platdata && dev->of_offset >= 0) {
ret = drv->ofdata_to_platdata(dev);
if (ret)
@ -352,12 +358,20 @@ int device_remove(struct udevice *dev)
goto err_remove;
}
if (dev->parent && dev->parent->driver->child_post_remove) {
ret = dev->parent->driver->child_post_remove(dev);
if (ret) {
dm_warn("%s: Device '%s' failed child_post_remove()",
__func__, dev->name);
}
}
device_free(dev);
dev->seq = -1;
dev->flags &= ~DM_FLAG_ACTIVATED;
return 0;
return ret;
err_remove:
/* We can't put the children back */