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dm: core: Add a way to find a device by its driver

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Some SoCs have a single clock device. Provide a way to find it given its
driver name. This is handled by the linker so will fail if the name is not
found, avoiding strange errors when names change and do not match. It is
also faster than a string comparison.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2016-07-17 15:23:15 -06:00
parent c3f03ffbe3
commit c57f806bf2
3 changed files with 42 additions and 0 deletions
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20
drivers/core/uclass.c
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@ -311,6 +311,26 @@ static int uclass_find_device_by_phandle(enum uclass_id id,
}
#endif
int uclass_get_device_by_driver(enum uclass_id id,
const struct driver *find_drv,
struct udevice **devp)
{
struct udevice *dev;
struct uclass *uc;
int ret;
ret = uclass_get(id, &uc);
if (ret)
return ret;
list_for_each_entry(dev, &uc->dev_head, uclass_node) {
if (dev->driver == find_drv)
return uclass_get_device_tail(dev, 0, devp);
}
return -ENODEV;
}
int uclass_get_device_tail(struct udevice *dev, int ret,
struct udevice **devp)
{