Hi Rob

quoted

#define for_each_port_endpoint_of_node(parent, port, child) \
	for (child = of_graph_get_endpoint_by_regs(parent, port, -1); child != NULL; \
	     child = of_get_next_child(parent, child))

Hmm... I noticed it is impossible so for.
of_graph_get_endpoint_by_regs() (A) is based on for_each_endpoint_of_node() (B).
Thus, we can't replace for_each_endpoint_of_node() (B) with by_regs (A)

(A)	struct device_node *of_graph_get_endpoint_by_regs(...)
	{
		...
(B)		for_each_endpoint_of_node(parent, node) {
			...
		}

		return NULL;
	}

	- patch-set for reduce/remove to using current next_endpoint()
	- patch-set for rename current next_endpoint() to next_device_endpoint()
	- patch-set for adding new next_port_endpoint()

So, maybe we can do is,

	0) rename current endpoint functions to device_endpoint

	1) add new port base functions (port_endpoint) which has
	   for_each_of_graph_port_endpoint() loop. It is for port base endpoint loop
	   (I want to use new naming, using of_graph instead of _of_node).

	2) replace above (B) part with port base loops 

	-	for_each_endpoint_of_node(parent, node) {
	+	for_each_of_gprah_port(parent, port) {
	+		for_each_of_graph_port_endpoint(port, endpoint) {

	3) replace current next_endpoint() by next_endpoint_by_regs(),
	   and remove next_endpoint()

What do you think ?

Thank you for your help !!

Best regards
---
Renesas Electronics
Ph.D. Kuninori Morimoto