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From: Lukas Wunner <lukas@wunner.de>
To: Vidya Sagar <vidyas@nvidia.com>
Cc: bhelgaas@google.com, robh+dt@kernel.org,
	krzysztof.kozlowski+dt@linaro.org, lpieralisi@kernel.org,
	kw@linux.com, thierry.reding@gmail.com, jonathanh@nvidia.com,
	mani@kernel.org, Sergey.Semin@baikalelectronics.ru,
	jszhang@kernel.org, linux-pci@vger.kernel.org,
	linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org,
	devicetree@vger.kernel.org, kthota@nvidia.com,
	mmaddireddy@nvidia.com, sagar.tv@gmail.com,
	"Marek Behún" <kabel@kernel.org>, "Pali Rohár" <pali@kernel.org>,
	"Jonathan Derrick" <jonathan.derrick@linux.dev>
Subject: Re: [PATCH V1 1/4] dt-bindings: Add "hotplug-gpios" PCIe property
Date: Sat, 1 Oct 2022 17:56:26 +0200	[thread overview]
Message-ID: <20221001155626.GA9324@wunner.de> (raw)
In-Reply-To: <20220930192747.21471-2-vidyas@nvidia.com>

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

  reply	other threads:[~2022-10-01 15:56 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-30 19:27 [PATCH V1 0/4] GPIO based PCIe Hot-Plug support Vidya Sagar
2022-09-30 19:27 ` [PATCH V1 1/4] dt-bindings: Add "hotplug-gpios" PCIe property Vidya Sagar
2022-10-01 15:56   ` Lukas Wunner [this message]
2022-10-01 16:10     ` Pali Rohár
2022-09-30 19:27 ` [PATCH V1 2/4] PCI/hotplug: Add GPIO PCIe hotplug driver Vidya Sagar
2022-09-30 19:27 ` [PATCH V1 3/4] PCI: tegra194: Add support to configure a pluggable slot Vidya Sagar
2022-09-30 19:27 ` [PATCH V1 4/4] PCI: tegra194: Enable GPIO based Hot-Plug support Vidya Sagar
2022-10-01 16:00 ` [PATCH V1 0/4] GPIO based PCIe " Lukas Wunner
2022-10-01 16:20   ` Pali Rohár
2022-10-01 23:50     ` Jonathan Derrick
2022-10-03 18:09       ` Bjorn Helgaas
2022-10-03 18:21         ` Pali Rohár
2022-10-03 19:18           ` Jonathan Derrick
2022-10-04  4:04           ` Vidya Sagar
2022-10-10  6:14             ` Vidya Sagar
2022-10-17  2:46               ` Vidya Sagar
2022-11-09 15:35                 ` Manivannan Sadhasivam
2022-10-03 17:04 ` Rob Herring

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