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Subject[PATCH v1] drivers property: When no children in primary, try secondary
Date
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.shevchenko@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
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