[PATCH v1] drivers property: When no children in primary, try secondary

[Andy Shevchenko]

Software firmware nodes can provide a child node to its parent.
Since software node can be secondary, we need a mechanism to access
the children. The idea is to list children of the primary node first
and when they are finished, continue with secondary node if available.

Signed-off-by: Andy Shevchenko <andriy.shevche...@linux.intel.com>
---
 drivers/base/property.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 5f35c0ccf5e0..1e6d75e65938 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -708,14 +708,23 @@ struct fwnode_handle *device_get_next_child_node(struct 
device *dev,
                                                 struct fwnode_handle *child)
 {
        struct acpi_device *adev = ACPI_COMPANION(dev);
-       struct fwnode_handle *fwnode = NULL;
+       struct fwnode_handle *fwnode = NULL, *next;
 
        if (dev->of_node)
                fwnode = &dev->of_node->fwnode;
        else if (adev)
                fwnode = acpi_fwnode_handle(adev);
 
-       return fwnode_get_next_child_node(fwnode, child);
+       /* Try to find a child in primary fwnode */
+       next = fwnode_get_next_child_node(fwnode, child);
+       if (next)
+               return next;
+
+       /* When no more children in primary, continue with secondary */
+       if (!IS_ERR_OR_NULL(fwnode->secondary))
+               next = fwnode_get_next_child_node(fwnode->secondary, child);
+
+       return next;
 }
 EXPORT_SYMBOL_GPL(device_get_next_child_node);
 
-- 
2.26.2