From: Vidya Sagar <vidyas@nvidia.com>
To: <lorenzo.pieralisi@arm.com>, <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>
Cc: devicetree@vger.kernel.org, mmaddireddy@nvidia.com,
kthota@nvidia.com, linux-pci@vger.kernel.org,
linux-kernel@vger.kernel.org, mperttunen@nvidia.com,
linux-tegra@vger.kernel.org, digetx@gmail.com, vidyas@nvidia.com,
linux-arm-kernel@lists.infradead.org, sagar.tv@gmail.com
Subject: [PATCH V11 08/12] dt-bindings: Add PCIe supports-clkreq property
Date: Mon, 24 Jun 2019 14:45:01 +0530 [thread overview]
Message-ID: <20190624091505.1711-9-vidyas@nvidia.com> (raw)
In-Reply-To: <20190624091505.1711-1-vidyas@nvidia.com>
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
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>
---
Changes since [v10]:
* None
Changes since [v9]:
* None
Changes since [v8]:
* None
Changes since [v7]:
* None
Changes since [v6]:
* None
Changes since [v5]:
* s/Documentation\/devicetree/dt-bindings/ in the subject
Changes since [v4]:
* None
Changes since [v3]:
* Rebased on top of linux-next top of the tree
Changes since [v2]:
* None
Changes since [v1]:
* 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 92c01db610df..d132f9efeb3e 100644
--- a/Documentation/devicetree/bindings/pci/pci.txt
+++ b/Documentation/devicetree/bindings/pci/pci.txt
@@ -24,6 +24,11 @@ driver implementation may support the following properties:
unsupported link speed, for instance, trying to do training for
unsupported link speed, etc. Must be '4' for gen4, '3' for gen3, '2'
for gen2, and '1' for gen1. Any other values are invalid.
+- 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
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next prev parent reply other threads:[~2019-06-24 9:18 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-24 9:14 [PATCH V11 00/12] Add Tegra194 PCIe support Vidya Sagar
2019-06-24 9:14 ` [PATCH V11 01/12] PCI: Add #defines for some of PCIe spec r4.0 features Vidya Sagar
2019-06-27 14:38 ` Lorenzo Pieralisi
2019-07-01 12:42 ` Vidya Sagar
2019-06-24 9:14 ` [PATCH V11 02/12] PCI: Disable MSI for Tegra root ports Vidya Sagar
2019-06-24 9:14 ` [PATCH V11 03/12] PCI: dwc: Perform dbi regs write lock towards the end Vidya Sagar
2019-06-27 14:58 ` Lorenzo Pieralisi
2019-06-27 15:33 ` Vidya Sagar
2019-06-27 15:50 ` Lorenzo Pieralisi
2019-06-27 16:52 ` Vidya Sagar
2019-06-24 9:14 ` [PATCH V11 04/12] PCI: dwc: Move config space capability search API Vidya Sagar
2019-06-24 9:14 ` [PATCH V11 05/12] PCI: dwc: Add ext " Vidya Sagar
2019-06-24 9:14 ` [PATCH V11 06/12] dt-bindings: PCI: designware: Add binding for CDM register check Vidya Sagar
2019-06-24 9:15 ` [PATCH V11 07/12] PCI: dwc: Add support to enable " Vidya Sagar
2019-06-24 9:15 ` Vidya Sagar [this message]
2019-06-24 9:15 ` [PATCH V11 09/12] dt-bindings: PCI: tegra: Add device tree support for Tegra194 Vidya Sagar
2019-06-24 9:15 ` [PATCH V11 10/12] dt-bindings: PHY: P2U: Add Tegra194 P2U block Vidya Sagar
2019-06-24 9:15 ` [PATCH V11 11/12] phy: tegra: Add PCIe PIPE2UPHY support Vidya Sagar
2019-06-24 9:15 ` [PATCH V11 12/12] PCI: tegra: Add Tegra194 PCIe support Vidya Sagar
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