dm: core: Add device children and sibling functions

Add some utility functions to check for children and for the last sibling in
a device's parent.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Marek Vasut <marex@denx.de>

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/core/device.c b/drivers/core/device.c
index b7ed21c003..ccaa99ca63 100644
--- a/drivers/core/device.c
+++ b/drivers/core/device.c
@@ -490,3 +490,31 @@ fdt_addr_t dev_get_addr(struct udevice *dev)
 	return FDT_ADDR_T_NONE;
 }
 #endif
+
+bool device_has_children(struct udevice *dev)
+{
+	return !list_empty(&dev->child_head);
+}
+
+bool device_has_active_children(struct udevice *dev)
+{
+	struct udevice *child;
+
+	for (device_find_first_child(dev, &child);
+	     child;
+	     device_find_next_child(&child)) {
+		if (device_active(child))
+			return true;
+	}
+
+	return false;
+}
+
+bool device_is_last_sibling(struct udevice *dev)
+{
+	struct udevice *parent = dev->parent;
+
+	if (!parent)
+		return false;
+	return list_is_last(&dev->sibling_node, &parent->child_head);
+}