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dm: uclass: Add uclass_next_device_err() to return a valid device

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Similarly to uclass_first_device_err(), add uclass_next_device_err()
which returns an error if there are no next devices in that uclass.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Patrice Chotard 2018-10-24 14:10:15 +02:00 committed by Tom Rini
parent 8bbb5b2085
commit f6abd5389c
2 changed files with 25 additions and 0 deletions
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13
drivers/core/uclass.c
View File

@ -562,6 +562,19 @@ int uclass_next_device(struct udevice **devp)
return uclass_get_device_tail(dev, ret, devp);
}
int uclass_next_device_err(struct udevice **devp)
{
int ret;
ret = uclass_next_device(devp);
if (ret)
return ret;
else if (!*devp)
return -ENODEV;
return 0;
}
int uclass_first_device_check(enum uclass_id id, struct udevice **devp)
{
int ret;

12
include/dm/uclass.h
View File

@ -307,6 +307,18 @@ int uclass_first_device_err(enum uclass_id id, struct udevice **devp);
*/
int uclass_next_device(struct udevice **devp);
/**
* uclass_next_device_err() - Get the next device in a uclass
*
* The device returned is probed if necessary, and ready for use
*
* @devp: On entry, pointer to device to lookup. On exit, returns pointer
* to the next device in the uclass if no error occurred, or -ENODEV if
* there is no next device.
* @return 0 if found, -ENODEV if not found, other -ve on error
*/
int uclass_next_device_err(struct udevice **devp);
/**
* uclass_first_device_check() - Get the first device in a uclass
*