diff options
| author | Simon Glass <sjg@chromium.org> | 2015-06-23 15:38:37 -0600 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2015-07-21 17:39:22 -0600 |
| commit | 2693047acdcdae20b066715d0da4937814347935 (patch) | |
| tree | 26da337c474cd8485f03b4088512fc832c0dd73a /drivers/core | |
| parent | 3039811e6584d55c6a330a7cf409f4dcea13ee31 (diff) | |
dm: core: Add a function to find any device from device tree
In some rare cases it is useful to be able to locate a device given a device
tree node offset. An example is when you have an alias that points to a node
and you want to find the associated device. The device may be SPI, MMC or
something else, but you don't need to know the uclass to find it.
Add a function to do a global search for a device, given its device tree
offset.
Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers/core')
| -rw-r--r-- | drivers/core/device.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/core/device.c b/drivers/core/device.c index 85fd1fc735..43aff54059 100644 --- a/drivers/core/device.c +++ b/drivers/core/device.c @@ -470,6 +470,31 @@ int device_get_child_by_of_offset(struct udevice *parent, int seq, return device_get_device_tail(dev, ret, devp); } +static struct udevice *_device_find_global_by_of_offset(struct udevice *parent, + int of_offset) +{ + struct udevice *dev, *found; + + if (parent->of_offset == of_offset) + return parent; + + list_for_each_entry(dev, &parent->child_head, sibling_node) { + found = _device_find_global_by_of_offset(dev, of_offset); + if (found) + return found; + } + + return NULL; +} + +int device_get_global_by_of_offset(int of_offset, struct udevice **devp) +{ + struct udevice *dev; + + dev = _device_find_global_by_of_offset(gd->dm_root, of_offset); + return device_get_device_tail(dev, dev ? 0 : -ENOENT, devp); +} + int device_find_first_child(struct udevice *parent, struct udevice **devp) { if (list_empty(&parent->child_head)) { |