[PATCH v4 11/14] 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.

Also rewrite the existing "remote == dev_of_node(dev)" with
device_match_of_node() for consistency.

Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
---
Changes since v3:
- Drop redundant device node validity check; device_match_of_node()
  does it internally (Andy)

Changes since v2:
- Use device_match_of_node()
---
 drivers/power/sequencing/pwrseq-pcie-m2.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/power/sequencing/pwrseq-pcie-m2.c b/drivers/power/sequencing/pwrseq-pcie-m2.c
index 83fe6a1396bc..733190175f84 100644
--- a/drivers/power/sequencing/pwrseq-pcie-m2.c
+++ b/drivers/power/sequencing/pwrseq-pcie-m2.c
@@ -175,9 +175,18 @@ 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 (device_match_of_node(dev, remote_port))
+			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)))
+
+		if (device_match_of_node(dev, remote))
 			return PWRSEQ_MATCH_OK;
 	}
 
-- 
2.55.0.795.g602f6c329a-goog