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dm: core: Add uclass_first_device_err() to return a valid device

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A common pattern is to call uclass_first_device() and then check if it
actually returns a device. Add a new function which does this, returning
an error if there are no devices in that uclass.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2016-02-11 13:23:25 -07:00
parent df61a74e68
commit b06750501f
2 changed files with 26 additions and 2 deletions
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13
drivers/core/uclass.c
View File

@ -401,6 +401,19 @@ int uclass_first_device(enum uclass_id id, struct udevice **devp)
return uclass_get_device_tail(dev, ret, devp);
}
int uclass_first_device_err(enum uclass_id id, struct udevice **devp)
{
int ret;
ret = uclass_first_device(id, devp);
if (ret)
return ret;
else if (!*devp)
return -ENODEV;
return 0;
}
int uclass_next_device(struct udevice **devp)
{
struct udevice *dev = *devp;

15
include/dm/uclass.h
View File

@ -200,10 +200,21 @@ int uclass_get_device_by_phandle(enum uclass_id id, struct udevice *parent,
*
* @id: Uclass ID to look up
* @devp: Returns pointer to the first device in that uclass, or NULL if none
* @return 0 if OK (found or not found), -1 on error
* @return 0 if OK (found or not found), other -ve on error
*/
int uclass_first_device(enum uclass_id id, struct udevice **devp);
/**
* uclass_first_device_err() - Get the first device in a uclass
*
* The device returned is probed if necessary, and ready for use
*
* @id: Uclass ID to look up
* @devp: Returns pointer to the first device in that uclass, or NULL if none
* @return 0 if found, -ENODEV if not found, other -ve on error
*/
int uclass_first_device_err(enum uclass_id id, struct udevice **devp);
/**
* uclass_next_device() - Get the next device in a uclass
*
@ -211,7 +222,7 @@ int uclass_first_device(enum uclass_id id, struct udevice **devp);
*
* @devp: On entry, pointer to device to lookup. On exit, returns pointer
* to the next device in the same uclass, or NULL if none
* @return 0 if OK (found or not found), -1 on error
* @return 0 if OK (found or not found), other -ve on error
*/
int uclass_next_device(struct udevice **devp);