dm: core: Add a few more specific child-finding functions
Add two functions which can find a child device by uclass or by name.
The first is useful with Multi-Function-Devices (MFDs) to find one of a
particular type. The second is useful when only the name is known.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/test/dm/test-fdt.c b/test/dm/test-fdt.c
index b70e3fa..0fbd9be 100644
--- a/test/dm/test-fdt.c
+++ b/test/dm/test-fdt.c
@@ -631,3 +631,30 @@
return 0;
}
DM_TEST(dm_test_fdt_phandle, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
+
+/* Test device_find_first_child_by_uclass() */
+static int dm_test_first_child(struct unit_test_state *uts)
+{
+ struct udevice *i2c, *dev, *dev2;
+
+ ut_assertok(uclass_first_device_err(UCLASS_I2C, &i2c));
+ ut_assertok(device_find_first_child_by_uclass(i2c, UCLASS_RTC, &dev));
+ ut_asserteq_str("rtc@43", dev->name);
+ ut_assertok(device_find_child_by_name(i2c, "rtc@43", &dev2));
+ ut_asserteq_ptr(dev, dev2);
+ ut_assertok(device_find_child_by_name(i2c, "rtc@61", &dev2));
+ ut_asserteq_str("rtc@61", dev2->name);
+
+ ut_assertok(device_find_first_child_by_uclass(i2c, UCLASS_I2C_EEPROM,
+ &dev));
+ ut_asserteq_str("eeprom@2c", dev->name);
+ ut_assertok(device_find_child_by_name(i2c, "eeprom@2c", &dev2));
+ ut_asserteq_ptr(dev, dev2);
+
+ ut_asserteq(-ENODEV, device_find_first_child_by_uclass(i2c,
+ UCLASS_VIDEO, &dev));
+ ut_asserteq(-ENODEV, device_find_child_by_name(i2c, "missing", &dev));
+
+ return 0;
+}
+DM_TEST(dm_test_first_child, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);