device property: Check fwnode->secondary when finding properties

fwnode_property_get_reference_args() searches for named properties
against a fwnode_handle, but these could instead be against the fwnode's
secondary. If the property isn't found against the primary, check the
secondary to see if it's there instead.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Daniel Scally <djrscally@gmail.com>
Link: https://lore.kernel.org/r/20211128232455.39332-1-djrscally@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/base/property.c b/drivers/base/property.c
index f1f35b48ab8b9670faee7a071220d801bda09a3f..11e3d6308eb036bdf5cd6c93cf9406eca0fab299 100644 (file)
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -478,8 +478,17 @@ int fwnode_property_get_reference_args(const struct fwnode_handle *fwnode,
                                       unsigned int nargs, unsigned int index,
                                       struct fwnode_reference_args *args)
 {
-       return fwnode_call_int_op(fwnode, get_reference_args, prop, nargs_prop,
-                                 nargs, index, args);
+       int ret;
+
+       ret = fwnode_call_int_op(fwnode, get_reference_args, prop, nargs_prop,
+                                nargs, index, args);
+
+       if (ret < 0 && !IS_ERR_OR_NULL(fwnode) &&
+           !IS_ERR_OR_NULL(fwnode->secondary))
+               ret = fwnode_call_int_op(fwnode->secondary, get_reference_args,
+                                        prop, nargs_prop, nargs, index, args);
+
+       return ret;
 }
 EXPORT_SYMBOL_GPL(fwnode_property_get_reference_args);