[PATCH v2 10/16] power: sequencing: pcie-m2: support matching on remote "port" node

[Chen-Yu Tsai <wenst@chromium.org>]

A USB hub can have multiple ports, and this driver needs to
differentiate which port is being matched to. The USB hub driver now
associates the "port" node with the usb_port device, so here we can
use the remote "port" node to check for a match. Then fall back to
the remote device node for the other connection types.

Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
---
 drivers/power/sequencing/pwrseq-pcie-m2.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/power/sequencing/pwrseq-pcie-m2.c b/drivers/power/sequencing/pwrseq-pcie-m2.c
index e82821655fc4..49293376956b 100644
--- a/drivers/power/sequencing/pwrseq-pcie-m2.c
+++ b/drivers/power/sequencing/pwrseq-pcie-m2.c
@@ -176,8 +176,17 @@ static int pwrseq_pcie_m2_match(struct pwrseq_device *pwrseq,
 	 * parent matches the OF node of 'dev'.
 	 */
 	for_each_endpoint_of_node(ctx->of_node, endpoint) {
+		/* USB port devices are tied to the port nodes. */
+		struct device_node *remote_port __free(device_node) =
+				of_graph_get_remote_port(endpoint);
+
+		if (remote_port && remote_port == dev_of_node(dev))
+			return PWRSEQ_MATCH_OK;
+
+		/* Try the remote port parent for other types. */
 		struct device_node *remote __free(device_node) =
 				of_graph_get_remote_port_parent(endpoint);
+
 		if (remote && (remote == dev_of_node(dev)))
 			return PWRSEQ_MATCH_OK;
 	}
-- 
2.54.0.1099.g489fc7bff1-goog