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 <sjg@chromium.org>
diff --git a/test/dm/core.c b/test/dm/core.c
index e0c5b9e..7371d3f 100644
--- a/test/dm/core.c
+++ b/test/dm/core.c
@@ -1351,3 +1351,25 @@
return 0;
}
DM_TEST(dm_test_dev_get_mem, UTF_SCAN_FDT);
+
+/* Test uclass_try_first_device() */
+static int dm_test_try_first_device(struct unit_test_state *uts)
+{
+ struct udevice *dev;
+
+ /* Check that it doesn't create a device or uclass */
+ ut_assertnull(uclass_find(UCLASS_TEST));
+ ut_assertnull(uclass_try_first_device(UCLASS_TEST));
+ ut_assertnull(uclass_try_first_device(UCLASS_TEST));
+ ut_assertnull(uclass_find(UCLASS_TEST));
+
+ /* Create a test device */
+ ut_assertok(device_bind_by_name(uts->root, false, &driver_info_manual,
+ &dev));
+ dev = uclass_try_first_device(UCLASS_TEST);
+ ut_assertnonnull(dev);
+ ut_asserteq(UCLASS_TEST, device_get_uclass_id(dev));
+
+ return 0;
+}
+DM_TEST(dm_test_try_first_device, 0);