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dm: Allow a device to be found by its FDT offset

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Each device that was bound from a device tree has an node that caused it to
be bound. Add functions that find and return a device based on a device tree
offset.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2014-07-23 06:55:14 -06:00
parent b7d665705e
commit f4cdead24a
4 changed files with 83 additions and 1 deletions
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35
drivers/core/uclass.c
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@@ -187,6 +187,30 @@ int uclass_find_device_by_seq(enum uclass_id id, int seq_or_req_seq,
return -ENODEV;
}
static int uclass_find_device_by_of_offset(enum uclass_id id, int node,
struct udevice **devp)
{
struct uclass *uc;
struct udevice *dev;
int ret;
*devp = NULL;
if (node < 0)
return -ENODEV;
ret = uclass_get(id, &uc);
if (ret)
return ret;
list_for_each_entry(dev, &uc->dev_head, uclass_node) {
if (dev->of_offset == node) {
*devp = dev;
return 0;
}
}
return -ENODEV;
}
/**
* uclass_get_device_tail() - handle the end of a get_device call
*
@@ -239,6 +263,17 @@ int uclass_get_device_by_seq(enum uclass_id id, int seq, struct udevice **devp)
return uclass_get_device_tail(dev, ret, devp);
}
int uclass_get_device_by_of_offset(enum uclass_id id, int node,
struct udevice **devp)
{
struct udevice *dev;
int ret;
*devp = NULL;
ret = uclass_find_device_by_of_offset(id, node, &dev);
return uclass_get_device_tail(dev, ret, devp);
}
int uclass_first_device(enum uclass_id id, struct udevice **devp)
{
struct uclass *uc;