[PATCH v3 10/13] power: sequencing: pcie-m2: support matching on remote "port" node
From: Chen-Yu Tsai <wenst@chromium.org>
Date: 2026-07-03 11:04:20
Also in:
driver-core, linux-acpi, linux-devicetree, linux-mediatek, linux-pm, linux-usb, lkml
Subsystem:
pcie m.2 power sequencing, power sequencing, the rest · Maintainers:
Manivannan Sadhasivam, Bartosz Golaszewski, Linus Torvalds
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 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 c8ee6df42b81..16a47f76e7ce 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 (remote_port && 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 (remote && device_match_of_node(dev, remote)) return PWRSEQ_MATCH_OK; }
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2.55.0.rc0.799.gd6f94ed593-goog