PCI/pwrctrl: Create pwrctrl device if 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 modeled as
Power Sequencing devices, they need to be controlled by the pwrctrl driver
like the Root Port/Slot supplies.

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

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Link: https://patch.msgid.link/20260128-pci-m2-v7-2-9b3a5fe3d244@oss.qualcomm.com

diff --git a/drivers/pci/pwrctrl/core.c b/drivers/pci/pwrctrl/core.c
index 1b91375738a08a3e18eb00627b2bc2245169482d..6f7dea6746e0e0d9db641bc09a7f4c31bc5047b1 100644 (file)
--- a/drivers/pci/pwrctrl/core.c
+++ b/drivers/pci/pwrctrl/core.c
@@ -9,6 +9,7 @@
 #include <linux/export.h>
 #include <linux/kernel.h>
 #include <linux/of.h>
+#include <linux/of_graph.h>
 #include <linux/of_platform.h>
 #include <linux/pci.h>
 #include <linux/pci-pwrctrl.h>
@@ -295,10 +296,10 @@ static int pci_pwrctrl_create_device(struct device_node *np,
 
        /*
         * Check whether the pwrctrl device really needs to be created or not.
-        * This is decided based on at least one of the power supplies being
-        * defined in the devicetree node of the device.
+        * This is decided based on at least one of the power supplies defined
+        * in the devicetree node of the device or the graph property.
         */
-       if (!of_pci_supply_present(np)) {
+       if (!of_pci_supply_present(np) && !of_graph_is_present(np)) {
                dev_dbg(parent, "Skipping OF node: %s\n", np->name);
                return 0;
        }