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dm: blk: Add a way to obtain a block device from its parent

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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>
This commit is contained in:
Simon Glass
2017-05-27 11:37:17 -06:00
committed by Jaehoon Chung
parent fc69d47262
commit 9f103b9cb5
3 changed files with 51 additions and 0 deletions
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18
test/dm/blk.c
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@@ -150,3 +150,21 @@ static int dm_test_blk_devnum(struct unit_test_state *uts)
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);