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dm: core: Allow iterating devices without uclass_get()

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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>
This commit is contained in:
Simon Glass 2020-02-06 09:54:49 -07:00 committed by Bin Meng
parent 2999846c11
commit 3cf0fba4ff
2 changed files with 38 additions and 0 deletions
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17
include/dm/uclass.h
View file

@ -365,6 +365,23 @@ int uclass_next_device_check(struct udevice **devp);
*/
int uclass_resolve_seq(struct udevice *dev);
/**
* uclass_id_foreach_dev() - Helper function to iteration through devices
*
* This creates a for() loop which works through the available devices in
* a uclass ID in order from start to end.
*
* If for some reason the uclass cannot be found, this does nothing.
*
* @id: enum uclass_id ID to use
* @pos: struct udevice * to hold the current device. Set to NULL when there
* are no more devices.
* @uc: temporary uclass variable (struct udevice *)
*/
#define uclass_id_foreach_dev(id, pos, uc) \
if (!uclass_get(id, &uc)) \
list_for_each_entry(pos, &uc->dev_head, uclass_node)
/**
* uclass_foreach_dev() - Helper function to iteration through devices
*

21
test/dm/test-fdt.c
View file

@ -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
*