Commit 0a2e1a5b authored by Kuninori Morimoto's avatar Kuninori Morimoto Committed by Greg Kroah-Hartman

ASoC: simple-card-utils: check "reg" property on asoc_simple_card_get_dai_id()

[ Upstream commit a0c426fe ]

We will get DAI ID from "reg" property if it has on DT, otherwise get
it by counting port/endpoint.

But in below case, we need to get DAI ID = 0 via port reg = <0>, but
current implementation returns ID = 1, because it can't judge ID = 0 was
from "non reg" or "reg = <0>".
Thus, it will count port/endpoint number as "non reg" case.

of_graph_parse_endpoint() implementation itself is not a problem,
but because asoc_simple_card_get_dai_id() need to count port/endpoint
number when "non reg" case, it need to know ID = 0 was from
"non reg" or "reg = <0>".
This patch fix this issue.

	port {
		reg = <0>;
		xxxx: endpoint@0 {
=>		xxxx: endpoint@1 {
Signed-off-by: 's avatarKuninori Morimoto <>
Signed-off-by: 's avatarMark Brown <>
Signed-off-by: 's avatarSasha Levin <>
parent 45040e92
......@@ -283,12 +283,20 @@ static int asoc_simple_card_get_dai_id(struct device_node *ep)
/* use endpoint/port reg if exist */
ret = of_graph_parse_endpoint(ep, &info);
if (ret == 0) {
if (
* Because it will count port/endpoint if it doesn't have "reg".
* But, we can't judge whether it has "no reg", or "reg = <0>"
* only of_graph_parse_endpoint().
* We need to check "reg" property
if (of_get_property(ep, "reg", NULL))
if (info.port)
node = of_get_parent(ep);
if (of_get_property(node, "reg", NULL))
return info.port;
node = of_graph_get_port_parent(ep);
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