linux-kernel - [PATCH 1/3] PCI/pwrctrl: Bind a pwrctrl device if clocks are present

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Message-Id: <20251219172222.2808195-1-sean.anderson@linux.dev>
Date: Fri, 19 Dec 2025 12:22:20 -0500
From: Sean Anderson <sean.anderson@...ux.dev>
To: Manivannan Sadhasivam <mani@...nel.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kwilczynski@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Bartosz Golaszewski <brgl@...nel.org>
Cc: linux-pci@...r.kernel.org,
	Chen-Yu Tsai <wenst@...omium.org>,
	linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
	Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>,
	Brian Norris <briannorris@...omium.org>,
	Niklas Cassel <cassel@...nel.org>,
	Chen-Yu Tsai <wens@...nel.org>,
	Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>,
	Alex Elder <elder@...cstar.com>,
	Sean Anderson <sean.anderson@...ux.dev>
Subject: [PATCH 1/3] PCI/pwrctrl: Bind a pwrctrl device if clocks are present

Since commit 66db1d3cbdb0 ("PCI/pwrctrl: Add optional slot clock for PCI
slots"), power supplies are not the only resource PCI slots may create.
Also create a pwrctrl device if there are any clocks.

Signed-off-by: Sean Anderson <sean.anderson@...ux.dev>
---

 drivers/pci/of.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/of.c b/drivers/pci/of.c
index 3579265f1198..07546a16ac86 100644
--- a/drivers/pci/of.c
+++ b/drivers/pci/of.c
@@ -847,7 +847,7 @@ void of_pci_make_host_bridge_node(struct pci_host_bridge *bridge)
  * @np: Device tree node
  *
  * Check if the power supply for the PCI device is present in the device tree
- * node or not.
+ * node or not. Clocks may also create a device.
  *
  * Return: true if at least one power supply exists; false otherwise.
  */
@@ -860,6 +860,9 @@ bool of_pci_supply_present(struct device_node *np)
 		return false;
 
 	for_each_property_of_node(np, prop) {
+		if (!strcmp(prop->name, "clocks"))
+			return true;
+
 		supply = strrchr(prop->name, '-');
 		if (supply && !strcmp(supply, "-supply"))
 			return true;
-- 
2.35.1.1320.gc452695387.dirty