linux-kernel - [PATCH v2 2/3] dt-bindings: PCI: xilinx-pcie: Add reset-gpios for PERST#

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Message-ID: <20250325071832.21229-2-mike.looijmans@topic.nl>
Date: Tue, 25 Mar 2025 08:18:26 +0100
From: Mike Looijmans <mike.looijmans@...ic.nl>
To: linux-pci@...r.kernel.org,
	devicetree@...r.kernel.org
CC: Mike Looijmans <mike.looijmans@...ic.nl>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Conor Dooley <conor+dt@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Thippeswamy Havalige <thippeswamy.havalige@....com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/3] dt-bindings: PCI: xilinx-pcie: Add reset-gpios for PERST#

Introduce optional `reset-gpios` property to enable GPIO-based control
of the PCIe root port PERST# signal, as described in pci.txt.

Signed-off-by: Mike Looijmans <mike.looijmans@...ic.nl>
---

Changes in v2:
Add binding for reset-gpios

 .../devicetree/bindings/pci/xlnx,axi-pcie-host.yaml          | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/xlnx,axi-pcie-host.yaml b/Documentation/devicetree/bindings/pci/xlnx,axi-pcie-host.yaml
index fb87b960a250..2b0fabdd5e16 100644
--- a/Documentation/devicetree/bindings/pci/xlnx,axi-pcie-host.yaml
+++ b/Documentation/devicetree/bindings/pci/xlnx,axi-pcie-host.yaml
@@ -28,6 +28,9 @@ properties:
           ranges for the PCI memory regions (I/O space region is not
           supported by hardware)
 
+  reset-gpios:
+    maxItems: 1
+
   "#interrupt-cells":
     const: 1
 
@@ -63,6 +66,7 @@ unevaluatedProperties: false
 
 examples:
   - |
+    #include <dt-bindings/gpio/gpio.h>
     #include <dt-bindings/interrupt-controller/arm-gic.h>
     #include <dt-bindings/interrupt-controller/irq.h>
 
@@ -80,6 +84,7 @@ examples:
                         <0 0 0 3 &pcie_intc 3>,
                         <0 0 0 4 &pcie_intc 4>;
         ranges = <0x02000000 0 0x60000000 0x60000000 0 0x10000000>;
+        reset-gpios = <&gpio0 9 GPIO_ACTIVE_LOW>;
         pcie_intc: interrupt-controller {
             interrupt-controller;
             #address-cells = <0>;
-- 
2.43.0


Met vriendelijke groet / kind regards,

Mike Looijmans
System Expert


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