dm: core: Allow iterating devices without uclass_get()

At present we have uclass_foreach_dev() which requires that uclass_get()
be called beforehand to find the uclass. This is good if we suspect that
that function might fail, but often we know that the uclass is available.

Add a new helper which does this uclass_get() automatically, so that only
the uclass ID is needed.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/test/dm/test-fdt.c b/test/dm/test-fdt.c
index d59c449ce0..8ea536c309 100644
--- a/test/dm/test-fdt.c
+++ b/test/dm/test-fdt.c
@@ -448,6 +448,27 @@ static int dm_test_first_next_device(struct unit_test_state *uts)
 }
 DM_TEST(dm_test_first_next_device, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
 
+/* Test iteration through devices in a uclass */
+static int dm_test_uclass_foreach(struct unit_test_state *uts)
+{
+	struct udevice *dev;
+	struct uclass *uc;
+	int count;
+
+	count = 0;
+	uclass_id_foreach_dev(UCLASS_TEST_FDT, dev, uc)
+		count++;
+	ut_asserteq(8, count);
+
+	count = 0;
+	uclass_foreach_dev(dev, uc)
+		count++;
+	ut_asserteq(8, count);
+
+	return 0;
+}
+DM_TEST(dm_test_uclass_foreach, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
+
 /**
  * check_devices() - Check return values and pointers
  *