dm: blk: Add a way to obtain a block device from its parent
Many devices support a child block device (e.g. MMC, USB). Add a
convenient way to get this device given the parent device.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/test/dm/blk.c b/test/dm/blk.c
index 5c5eb82..923e8d9 100644
--- a/test/dm/blk.c
+++ b/test/dm/blk.c
@@ -150,3 +150,21 @@
return 0;
}
DM_TEST(dm_test_blk_devnum, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
+
+/* Test that we can get a block from its parent */
+static int dm_test_blk_get_from_parent(struct unit_test_state *uts)
+{
+ struct udevice *dev, *blk;
+
+ ut_assertok(uclass_get_device(UCLASS_MMC, 0, &dev));
+ ut_assertok(blk_get_from_parent(dev, &blk));
+
+ ut_assertok(uclass_get_device(UCLASS_I2C, 0, &dev));
+ ut_asserteq(-ENOTBLK, blk_get_from_parent(dev, &blk));
+
+ ut_assertok(uclass_get_device(UCLASS_GPIO, 0, &dev));
+ ut_asserteq(-ENODEV, blk_get_from_parent(dev, &blk));
+
+ return 0;
+}
+DM_TEST(dm_test_blk_get_from_parent, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);