linux-kernel - [PATCH v4 1/2] dt-bindings: PCI: amd-mdb: Add example usage of reset-gpios for PCIe RP PERST#

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Message-ID: <20250626054906.3277029-2-sai.krishna.musham@amd.com>
Date: Thu, 26 Jun 2025 11:19:05 +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: <lkp@...el.com>, <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 v4 1/2] dt-bindings: PCI: amd-mdb: Add example usage of reset-gpios for PCIe RP PERST#

Update the device tree binding example to include usage of the
`reset-gpios` property in PCIe Root Port (RP) bridge node for PERST#
signal handling.

Signed-off-by: Sai Krishna Musham <sai.krishna.musham@....com>
---
Changes in v4:
- Remove reset-gpios define as it is already part of pci-bus-common.yaml.

Changes in v3:
- Move reset-gpios to PCI bridge node.

Changes in v2:
- Update commit message

v3 https://lore.kernel.org/r/20250618080931.2472366-1-sai.krishna.musham@amd.com/
v2 https://lore.kernel.org/r/20250429090046.1512000-1-sai.krishna.musham@amd.com/
v1 https://lore.kernel.org/r/20250326041507.98232-1-sai.krishna.musham@amd.com/
---
 .../bindings/pci/amd,versal2-mdb-host.yaml    | 22 +++++++++++++++++++
 1 file changed, 22 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..421e1116ae7e 100644
--- a/Documentation/devicetree/bindings/pci/amd,versal2-mdb-host.yaml
+++ b/Documentation/devicetree/bindings/pci/amd,versal2-mdb-host.yaml
@@ -71,6 +71,17 @@ properties:
       - "#address-cells"
       - "#interrupt-cells"
 
+patternProperties:
+  '^pcie@[0-2],0$':
+    type: object
+    $ref: /schemas/pci/pci-pci-bridge.yaml#
+
+    properties:
+      reg:
+        maxItems: 1
+
+    unevaluatedProperties: false
+
 required:
   - reg
   - reg-names
@@ -87,6 +98,7 @@ 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 +124,16 @@ 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>;
-- 
2.44.1