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Date: Sat, 1 Oct 2022 17:56:26 +0200 From: Lukas Wunner <lukas@...ner.de> To: Vidya Sagar <vidyas@...dia.com> Cc: 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, 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, sagar.tv@...il.com, Marek Behún <kabel@...nel.org>, Pali Rohár <pali@...nel.org>, Jonathan Derrick <jonathan.derrick@...ux.dev> Subject: Re: [PATCH V1 1/4] dt-bindings: Add "hotplug-gpios" PCIe property On Sat, Oct 01, 2022 at 12:57:44AM +0530, Vidya Sagar wrote: > 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. [...] > --- 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. Please specify the GPIO's semantics in more detail: Is the pin high as long as presence of a card is detected? Or does it pulse when a hotplug/unplug event occurs? Thanks, Lukas
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