linux-kernel - [PATCH V1 1/4] dt-bindings: Add "hotplug-gpios" PCIe property

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Date:   Sat, 1 Oct 2022 00:57:44 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     <bhelgaas@...gle.com>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <lpieralisi@...nel.org>,
        <kw@...ux.com>, <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <mani@...nel.org>, <Sergey.Semin@...kalelectronics.ru>,
        <jszhang@...nel.org>
CC:     <linux-pci@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <kthota@...dia.com>, <mmaddireddy@...dia.com>, <vidyas@...dia.com>,
        <sagar.tv@...il.com>
Subject: [PATCH V1 1/4] dt-bindings: Add "hotplug-gpios" PCIe property

Provide a way for the firmware to tell the OS about the GPIO that can be
used to get the Hot-Plug and Unplug events.

Signed-off-by: Vidya Sagar <vidyas@...dia.com>
---
 Documentation/devicetree/bindings/pci/pci.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/pci.txt b/Documentation/devicetree/bindings/pci/pci.txt
index 6a8f2874a24d..7b89bddc8dde 100644
--- a/Documentation/devicetree/bindings/pci/pci.txt
+++ b/Documentation/devicetree/bindings/pci/pci.txt
@@ -32,6 +32,10 @@ driver implementation may support the following properties:
    root port to downstream device and host bridge drivers can do programming
    which depends on CLKREQ signal existence. For example, programming root port
    not to advertise ASPM L1 Sub-States support if there is no CLKREQ signal.
+- hotplug-gpios:
+   If present this property specifies the GPIO to be used for Hot-Plug/Unplug
+   functionality. It is used by the PCIe GPIO Hot-Plug core driver for
+   PCIe device Hot-Plug/Unplug events.
 
 PCI-PCI Bridge properties
 -------------------------
-- 
2.17.1