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drivers property: When no children in primary, try secondary

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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>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20200520102959.34812-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andy Shevchenko 2020-05-20 13:29:59 +03:00 • committed by Greg Kroah-Hartman
parent c82c83c330
commit 114dbb4fa7
1 changed files with 11 additions and 2 deletions
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13
drivers/base/property.c
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@ -708,14 +708,23 @@ struct fwnode_handle *device_get_next_child_node(struct device *dev,
struct fwnode_handle *child) struct fwnode_handle *child)
{ {
struct acpi_device *adev = ACPI_COMPANION(dev); struct acpi_device *adev = ACPI_COMPANION(dev);
struct fwnode_handle *fwnode = NULL; struct fwnode_handle *fwnode = NULL, *next;
if (dev->of_node) if (dev->of_node)
fwnode = &dev->of_node->fwnode; fwnode = &dev->of_node->fwnode;
else if (adev) else if (adev)
fwnode = acpi_fwnode_handle(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); EXPORT_SYMBOL_GPL(device_get_next_child_node);