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

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Message-ID: <20250326041507.98232-2-sai.krishna.musham@amd.com>
Date: Wed, 26 Mar 2025 09:45:06 +0530
From: Sai Krishna Musham <sai.krishna.musham@....com>
To: <bhelgaas@...gle.com>, <lpieralisi@...nel.org>, <kw@...ux.com>,
	<manivannan.sadhasivam@...aro.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 1/2] dt-bindings: PCI: amd-mdb: Add reset-gpios property to handle PCIe RP PERST#

Add `reset-gpios` property to enable TCA6416 I2C GPIO expander based
handling of the PCIe PERST# signal.

Signed-off-by: Sai Krishna Musham <sai.krishna.musham@....com>
---
 Documentation/devicetree/bindings/pci/amd,versal2-mdb-host.yaml | 2 ++
 1 file changed, 2 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..e6117d326279 100644
--- a/Documentation/devicetree/bindings/pci/amd,versal2-mdb-host.yaml
+++ b/Documentation/devicetree/bindings/pci/amd,versal2-mdb-host.yaml
@@ -87,6 +87,7 @@ 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 +113,7 @@ examples:
             #size-cells = <2>;
             #interrupt-cells = <1>;
             device_type = "pci";
+            reset-gpios = <&tca6416_u37 7 GPIO_ACTIVE_LOW>;
             pcie_intc_0: interrupt-controller {
                 #address-cells = <0>;
                 #interrupt-cells = <1>;
-- 
2.31.1