linux-kernel - [PATCH v3 1/2] dt-bindings: PCI: amd-mdb: Add reset-gpios property for PCIe RP PERST# handling

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Message-ID: <20250618080931.2472366-2-sai.krishna.musham@amd.com>
Date: Wed, 18 Jun 2025 13:39:30 +0530
From: Sai Krishna Musham <sai.krishna.musham@....com>
To: <bhelgaas@...gle.com>, <lpieralisi@...nel.org>, <kw@...ux.com>,
	<mani@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
	<conor+dt@...nel.org>, <cassel@...nel.org>
CC: <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <michal.simek@....com>,
	<bharat.kumar.gogada@....com>, <thippeswamy.havalige@....com>,
	<sai.krishna.musham@....com>
Subject: [PATCH v3 1/2] dt-bindings: PCI: amd-mdb: Add reset-gpios property for PCIe RP PERST# handling

Add support for the `reset-gpios` property in the PCIe Root Port (RP)
child node to handle the PERST# signal via GPIO. Update the example
to reflect this addition.

Signed-off-by: Sai Krishna Musham <sai.krishna.musham@....com>
---
Changes in v3:
- Move reset-gpios to PCI bridge node.

Changes in v2:
- Update commit message
---
 .../bindings/pci/amd,versal2-mdb-host.yaml    | 26 +++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/amd,versal2-mdb-host.yaml b/Documentation/devicetree/bindings/pci/amd,versal2-mdb-host.yaml
index 43dc2585c237..3ffe4512650d 100644
--- a/Documentation/devicetree/bindings/pci/amd,versal2-mdb-host.yaml
+++ b/Documentation/devicetree/bindings/pci/amd,versal2-mdb-host.yaml
@@ -71,6 +71,21 @@ properties:
       - "#address-cells"
       - "#interrupt-cells"
 
+patternProperties:
+  '^pcie@[0-2],0$':
+    type: object
+    $ref: /schemas/pci/pci-pci-bridge.yaml#
+
+    properties:
+      reg:
+        maxItems: 1
+
+      reset-gpios:
+        description: GPIO controlled connection to PERST# signal
+        maxItems: 1
+
+    unevaluatedProperties: false
+
 required:
   - reg
   - reg-names
@@ -87,6 +102,7 @@ examples:
   - |
     #include <dt-bindings/interrupt-controller/arm-gic.h>
     #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/gpio/gpio.h>
 
     soc {
         #address-cells = <2>;
@@ -112,6 +128,16 @@ examples:
             #size-cells = <2>;
             #interrupt-cells = <1>;
             device_type = "pci";
+
+            pcie@0,0 {
+                device_type = "pci";
+                reg = <0x0 0x0 0x0 0x0 0x0>;
+                reset-gpios = <&tca6416_u37 7 GPIO_ACTIVE_LOW>;
+                #address-cells = <3>;
+                #size-cells = <2>;
+                ranges;
+            };
+
             pcie_intc_0: interrupt-controller {
                 #address-cells = <0>;
                 #interrupt-cells = <1>;
-- 
2.43.0