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dm: core: Add a function to find the first inactive child

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Some devices have children and want to press an existing inactive child
into service when needed. Add a function to help with this.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2018-10-01 12:22:07 -06:00
parent 9f15cc14bf
commit cdb6aa0afb
3 changed files with 64 additions and 0 deletions
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18
drivers/core/device.c
View file

@ -681,6 +681,24 @@ int device_find_next_child(struct udevice **devp)
return 0;
}
int device_find_first_inactive_child(struct udevice *parent,
enum uclass_id uclass_id,
struct udevice **devp)
{
struct udevice *dev;
*devp = NULL;
list_for_each_entry(dev, &parent->child_head, sibling_node) {
if (!device_active(dev) &&
device_get_uclass_id(dev) == uclass_id) {
*devp = dev;
return 0;
}
}
return -ENODEV;
}
struct udevice *dev_get_parent(const struct udevice *child)
{
return child->parent;

15
include/dm/device.h
View file

@ -519,6 +519,21 @@ int device_find_first_child(struct udevice *parent, struct udevice **devp);
*/
int device_find_next_child(struct udevice **devp);
/**
* device_find_first_inactive_child() - Find the first inactive child
*
* This is used to locate an existing child of a device which is of a given
* uclass.
*
* @parent: Parent device to search
* @uclass_id: Uclass to look for
* @devp: Returns device found, if any
* @return 0 if found, else -ENODEV
*/
int device_find_first_inactive_child(struct udevice *parent,
enum uclass_id uclass_id,
struct udevice **devp);
/**
* device_has_children() - check if a device has any children
*

31
test/dm/core.c
View file

@ -870,3 +870,34 @@ static int dm_test_uclass_names(struct unit_test_state *uts)
return 0;
}
DM_TEST(dm_test_uclass_names, DM_TESTF_SCAN_PDATA);
static int dm_test_inactive_child(struct unit_test_state *uts)
{
struct dm_test_state *dms = uts->priv;
struct udevice *parent, *dev1, *dev2;
/* Skip the behaviour in test_post_probe() */
dms->skip_post_probe = 1;
ut_assertok(uclass_first_device_err(UCLASS_TEST, &parent));
/*
* Create a child but do not activate it. Calling the function again
* should return the same child.
*/
ut_asserteq(-ENODEV, device_find_first_inactive_child(parent,
UCLASS_TEST, &dev1));
ut_assertok(device_bind_ofnode(parent, DM_GET_DRIVER(test_drv),
"test_child", 0, ofnode_null(), &dev1));
ut_assertok(device_find_first_inactive_child(parent, UCLASS_TEST,
&dev2));
ut_asserteq_ptr(dev1, dev2);
ut_assertok(device_probe(dev1));
ut_asserteq(-ENODEV, device_find_first_inactive_child(parent,
UCLASS_TEST, &dev2));
return 0;
}
DM_TEST(dm_test_inactive_child, DM_TESTF_SCAN_PDATA);