From cedf9ccaa27828876bc29b1dfc721cea2e5e6dfc Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Sat, 19 Oct 2024 09:21:49 -0600 Subject: dm: core: Add a function to see if a device exists All the uclass functions for finding a device end up creating a uclass if it doesn't exist. Add a function which instead returns NULL in this case. This is useful when in the 'unbind' path, since we don't want to undo any unbinding which has already happened. Signed-off-by: Simon Glass --- include/dm/uclass.h | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'include') diff --git a/include/dm/uclass.h b/include/dm/uclass.h index 456eef7f2f3..c2793040923 100644 --- a/include/dm/uclass.h +++ b/include/dm/uclass.h @@ -435,6 +435,17 @@ int uclass_next_device_check(struct udevice **devp); int uclass_first_device_drvdata(enum uclass_id id, ulong driver_data, struct udevice **devp); +/** + * uclass_try_first_device()- See if there is a device for a uclass + * + * If the uclass exists, this returns the first device on that uclass, without + * probing it. If the uclass does not exist, it gives up + * + * @id: Uclass ID to check + * Return: Pointer to device, if found, else NULL + */ +struct udevice *uclass_try_first_device(enum uclass_id id); + /** * uclass_probe_all() - Probe all devices based on an uclass ID * -- cgit v1.2.3