linux-kernel - [PATCH v4 4/5] PCI/pwrctrl: Create pwrctrl device if the graph port is found

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Message-Id: <20251228-pci-m2-v4-4-5684868b0d5f@oss.qualcomm.com>
Date: Sun, 28 Dec 2025 22:31:04 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
To: Bjorn Helgaas <bhelgaas@...gle.com>,
        Manivannan Sadhasivam <mani@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Damien Le Moal <dlemoal@...nel.org>, Niklas Cassel <cassel@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Stephan Gerhold <stephan.gerhold@...aro.org>,
        Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        linux-pm@...r.kernel.org, linux-ide@...r.kernel.org,
        Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH v4 4/5] PCI/pwrctrl: Create pwrctrl device if the graph
 port is found

The devicetree node of the PCIe Root Port/Slot could have the graph port
to link the PCIe M.2 connector node. Since the M.2 connectors are modelled
as Power Sequencing devices, they need to be controlled by the pwrctrl
driver as like the Root Port/Slot supplies.

Hence, create the pwrctrl device if the graph port is found in the node.

Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
---
 drivers/pci/probe.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 41183aed8f5d..cd7efd20a74a 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -9,6 +9,7 @@
 #include <linux/init.h>
 #include <linux/pci.h>
 #include <linux/msi.h>
+#include <linux/of_graph.h>
 #include <linux/of_pci.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
@@ -2585,7 +2586,7 @@ static struct platform_device *pci_pwrctrl_create_device(struct pci_bus *bus, in
 	 * not. This is decided based on at least one of the power supplies
 	 * being defined in the devicetree node of the device.
 	 */
-	if (!of_pci_supply_present(np)) {
+	if (!of_pci_supply_present(np) && !of_graph_is_present(np)) {
 		pr_debug("PCI/pwrctrl: Skipping OF node: %s\n", np->name);
 		goto err_put_of_node;
 	}

-- 
2.48.1