From: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
To: Vidya Sagar <vidyas@nvidia.com>
Cc: bhelgaas@google.com, robh+dt@kernel.org, mark.rutland@arm.com,
thierry.reding@gmail.com, jonathanh@nvidia.com, kishon@ti.com,
catalin.marinas@arm.com, will.deacon@arm.com,
jingoohan1@gmail.com, gustavo.pimentel@synopsys.com,
digetx@gmail.com, mperttunen@nvidia.com,
linux-pci@vger.kernel.org, devicetree@vger.kernel.org,
linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, kthota@nvidia.com,
mmaddireddy@nvidia.com, sagar.tv@gmail.com
Subject: Re: [PATCH V13 08/12] dt-bindings: Add PCIe supports-clkreq property
Date: Wed, 10 Jul 2019 16:28:56 +0100 [thread overview]
Message-ID: <20190710152856.GB8781@e121166-lin.cambridge.arm.com> (raw)
In-Reply-To: <20190710062212.1745-9-vidyas@nvidia.com>
On Wed, Jul 10, 2019 at 11:52:08AM +0530, Vidya Sagar wrote:
> Some host controllers need to know the existence of clkreq signal routing to
> downstream devices to be able to advertise low power features like ASPM L1
> substates. Without clkreq signal routing being present, enabling ASPM L1 sub
> states might lead to downstream devices falling off the bus. Hence a new device
You mean "being disconnected from the bus" right ? I will update it.
Lorenzo
> tree property 'supports-clkreq' is added to make such host controllers
> aware of clkreq signal routing to downstream devices.
>
> Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
> Reviewed-by: Rob Herring <robh@kernel.org>
> Reviewed-by: Thierry Reding <treding@nvidia.com>
> ---
> V13:
> * None
>
> V12:
> * Rebased on top of linux-next top of the tree
>
> V11:
> * None
>
> V10:
> * None
>
> V9:
> * None
>
> V8:
> * None
>
> V7:
> * None
>
> V6:
> * s/Documentation\/devicetree/dt-bindings/ in the subject
>
> V5:
> * None
>
> V4:
> * Rebased on top of linux-next top of the tree
>
> V3:
> * None
>
> V2:
> * This is a new patch in v2 series
>
> Documentation/devicetree/bindings/pci/pci.txt | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/pci/pci.txt b/Documentation/devicetree/bindings/pci/pci.txt
> index 2a5d91024059..29bcbd88f457 100644
> --- a/Documentation/devicetree/bindings/pci/pci.txt
> +++ b/Documentation/devicetree/bindings/pci/pci.txt
> @@ -27,6 +27,11 @@ driver implementation may support the following properties:
> - reset-gpios:
> If present this property specifies PERST# GPIO. Host drivers can parse the
> GPIO and apply fundamental reset to endpoints.
> +- supports-clkreq:
> + If present this property specifies that CLKREQ signal routing exists from
> + 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.
>
> PCI-PCI Bridge properties
> -------------------------
> --
> 2.17.1
>
next prev parent reply other threads:[~2019-07-10 15:29 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-10 6:22 [PATCH V13 00/12] PCI: tegra: Add Tegra194 PCIe support Vidya Sagar
2019-07-10 6:22 ` [PATCH V13 01/12] PCI: Add #defines for some of PCIe spec r4.0 features Vidya Sagar
2019-07-10 20:14 ` Bjorn Helgaas
2019-07-10 6:22 ` [PATCH V13 02/12] PCI: Disable MSI for Tegra root ports Vidya Sagar
2019-07-10 6:22 ` [PATCH V13 03/12] PCI: dwc: Perform dbi regs write lock towards the end Vidya Sagar
2019-07-10 6:22 ` [PATCH V13 04/12] PCI: dwc: Move config space capability search API Vidya Sagar
2019-07-10 6:22 ` [PATCH V13 05/12] PCI: dwc: Add ext " Vidya Sagar
2019-07-10 10:37 ` Lorenzo Pieralisi
2019-07-10 11:27 ` Vidya Sagar
2019-07-10 14:19 ` Lorenzo Pieralisi
2019-07-10 6:22 ` [PATCH V13 06/12] dt-bindings: PCI: designware: Add binding for CDM register check Vidya Sagar
2019-07-10 6:22 ` [PATCH V13 07/12] PCI: dwc: Add support to enable " Vidya Sagar
2019-07-10 6:22 ` [PATCH V13 08/12] dt-bindings: Add PCIe supports-clkreq property Vidya Sagar
2019-07-10 15:28 ` Lorenzo Pieralisi [this message]
2019-07-10 17:14 ` Vidya Sagar
2019-07-10 6:22 ` [PATCH V13 09/12] dt-bindings: PCI: tegra: Add device tree support for Tegra194 Vidya Sagar
2019-07-10 6:22 ` [PATCH V13 10/12] dt-bindings: PHY: P2U: Add Tegra194 P2U block Vidya Sagar
2019-07-10 6:22 ` [PATCH V13 11/12] phy: tegra: Add PCIe PIPE2UPHY support Vidya Sagar
2019-07-10 6:22 ` [PATCH V13 12/12] PCI: tegra: Add Tegra194 PCIe support Vidya Sagar
2019-07-10 17:02 ` Lorenzo Pieralisi
2019-07-10 17:26 ` Vidya Sagar
2019-07-11 12:54 ` Lorenzo Pieralisi
2019-07-12 15:32 ` Vidya Sagar
2019-07-12 16:07 ` Lorenzo Pieralisi
2019-07-13 7:04 ` Vidya Sagar
2019-07-16 11:22 ` Lorenzo Pieralisi
2019-07-16 19:00 ` Bjorn Helgaas
2019-07-23 14:28 ` Vidya Sagar
2019-07-23 14:44 ` Vidya Sagar
2019-07-30 15:49 ` Lorenzo Pieralisi
2019-08-02 12:06 ` Vidya Sagar
2019-08-05 14:01 ` Lorenzo Pieralisi
2019-08-05 16:54 ` Vidya Sagar
2019-08-06 14:51 ` Lorenzo Pieralisi
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