While most phandle references in common bindings point to the supplier
device node, there are also common bindings where the phandle can
pointing to a child node of the supplier device node.
Therefore, when trying to find the supplier device that corresponds to a
supplier phandle, we need to make sure we are using the supplier's
device node. Otherwise, we'll never find the supplier device.
Signed-off-by: Saravana Kannan <saravanak@xxxxxxxxxx>
---
drivers/of/platform.c | 22 ++++++++++++++++++----
1 file changed, 18 insertions(+), 4 deletions(-)
diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index 98414ba53b1f..cf8625abe30c 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -529,19 +529,33 @@ static int of_link_binding(struct device *dev,
const char *binding, const char *cell)
{
struct of_phandle_args sup_args;
+ struct device_node *sup_np;
struct platform_device *sup_dev;
unsigned int i = 0, links = 0;
u32 dl_flags = DL_FLAG_AUTOPROBE_CONSUMER;
while (!of_parse_phandle_with_args(dev->of_node, binding, cell, i,
&sup_args)) {
- if (!of_link_is_valid(dev->of_node, sup_args.np)) {
- of_node_put(sup_args.np);
+ sup_np = sup_args.np;
+ /*
+ * Since we are trying to create device links, we need to find
+ * the actual device node that owns this supplier phandle.
+ * Often times it's the same node, but sometimes it can be one
+ * of the parents. So walk up the parent till you find a
+ * device.
+ */
+ while (sup_np && !of_find_property(sup_np, "compatible", NULL))
+ sup_np = of_get_next_parent(sup_np);
+ if (!sup_np)
+ continue;
+
+ if (!of_link_is_valid(dev->of_node, sup_np)) {
+ of_node_put(sup_np);
continue;
}
i++;
- sup_dev = of_find_device_by_node(sup_args.np);
- of_node_put(sup_args.np);
+ sup_dev = of_find_device_by_node(sup_np);
+ of_node_put(sup_np);
if (!sup_dev)
continue;
if (device_link_add(dev, &sup_dev->dev, dl_flags))
--
2.22.0.510.g264f2c817a-goog
