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dm: core: Add a function to find a device by drvdata

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It is sometimes useful to find a device in a uclass using only its driver
data. The driver data often indicates the 'subtype' of the device, e,g,
via its compatible string.

Add a function to handle this.

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 09:54:50 -07:00 committed by Bin Meng
parent 3cf0fba4ff
commit 50162348f0
4 changed files with 54 additions and 0 deletions
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17
drivers/core/uclass.c
View File

@ -629,6 +629,23 @@ int uclass_next_device_check(struct udevice **devp)
return device_probe(*devp);
}
int uclass_first_device_drvdata(enum uclass_id id, ulong driver_data,
struct udevice **devp)
{
struct udevice *dev;
struct uclass *uc;
uclass_id_foreach_dev(id, dev, uc) {
if (dev_get_driver_data(dev) == driver_data) {
*devp = dev;
return device_probe(dev);
}
}
return -ENODEV;
}
int uclass_bind_device(struct udevice *dev)
{
struct uclass *uc;

2
include/dm/test.h
View File

@ -56,6 +56,8 @@ enum {
enum {
DM_TEST_TYPE_FIRST = 0,
DM_TEST_TYPE_SECOND,
DM_TEST_TYPE_COUNT,
};
/* The number added to the ping total on each probe */

14
include/dm/uclass.h
View File

@ -350,6 +350,20 @@ int uclass_first_device_check(enum uclass_id id, struct udevice **devp);
*/
int uclass_next_device_check(struct udevice **devp);
/**
* uclass_first_device_drvdata() - Find the first device with given driver data
*
* This searches through the devices for a particular uclass looking for one
* that has the given driver data.
*
* @id: Uclass ID to check
* @driver_data: Driver data to search for
* @devp: Returns pointer to the first matching device in that uclass, if found
* @return 0 if found, -ENODEV if not found, other -ve on error
*/
int uclass_first_device_drvdata(enum uclass_id id, ulong driver_data,
struct udevice **devp);
/**
* uclass_resolve_seq() - Resolve a device's sequence number
*

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

@ -893,3 +893,24 @@ static int dm_test_read_int(struct unit_test_state *uts)
return 0;
}
DM_TEST(dm_test_read_int, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
/* Test iteration through devices by drvdata */
static int dm_test_uclass_drvdata(struct unit_test_state *uts)
{
struct udevice *dev;
ut_assertok(uclass_first_device_drvdata(UCLASS_TEST_FDT,
DM_TEST_TYPE_FIRST, &dev));
ut_asserteq_str("a-test", dev->name);
ut_assertok(uclass_first_device_drvdata(UCLASS_TEST_FDT,
DM_TEST_TYPE_SECOND, &dev));
ut_asserteq_str("d-test", dev->name);
ut_asserteq(-ENODEV, uclass_first_device_drvdata(UCLASS_TEST_FDT,
DM_TEST_TYPE_COUNT,
&dev));
return 0;
}
DM_TEST(dm_test_uclass_drvdata, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);