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From: Nadeem Athani <nadeem@cadence.com>
To: <tjoseph@cadence.com>, <bhelgaas@google.com>,
	<robh+dt@kernel.org>, <linux-pci@vger.kernel.org>,
	<devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<lorenzo.pieralisi@arm.com>, <robh@kernel.org>, <kishon@ti.com>
Cc: <mparab@cadence.com>, <sjakhade@cadence.com>,
	<nadeem@cadence.com>, <pthombar@cadence.com>
Subject: [PATCH 1/2] dt-bindings:pci: Set LTSSM Detect.Quiet state delay.
Date: Tue, 9 Mar 2021 08:31:41 +0100	[thread overview]
Message-ID: <20210309073142.13219-2-nadeem@cadence.com> (raw)
In-Reply-To: <20210309073142.13219-1-nadeem@cadence.com>

The parameter detect-quiet-min-delay can be used to program the minimum
time that LTSSM waits on entering Detect.Quiet state.
00 : 0us minimum wait time in Detect.Quiet state.
01 : 100us minimum wait time in Detect.Quiet state.
10 : 1000us minimum wait time in Detect.Quiet state.
11 : 2000us minimum wait time in Detect.Quiet state.

Signed-off-by: Nadeem Athani <nadeem@cadence.com>
---
 .../devicetree/bindings/pci/cdns,cdns-pcie-host.yaml        | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/cdns,cdns-pcie-host.yaml b/Documentation/devicetree/bindings/pci/cdns,cdns-pcie-host.yaml
index 293b8ec318bc..a1d56e0be419 100644
--- a/Documentation/devicetree/bindings/pci/cdns,cdns-pcie-host.yaml
+++ b/Documentation/devicetree/bindings/pci/cdns,cdns-pcie-host.yaml
@@ -27,6 +27,18 @@ properties:
 
   msi-parent: true
 
+  detect-quiet-min-delay:
+    description:
+      LTSSM Detect.Quiet state minimum delay.
+      00 : 0us minimum wait time
+      01 : 100us minimum wait time
+      10 : 1000us minimum wait time
+      11 : 2000us minimum wait time
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 0
+    maximum: 3
+    default: 0
+
 required:
   - reg
   - reg-names
@@ -48,6 +60,7 @@ examples:
             linux,pci-domain = <0>;
             vendor-id = <0x17cd>;
             device-id = <0x0200>;
+            detect-quiet-min-delay = <0>;
 
             reg = <0x0 0xfb000000  0x0 0x01000000>,
                   <0x0 0x41000000  0x0 0x00001000>;
-- 
2.15.0


  reply	other threads:[~2021-03-09  7:32 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-09  7:31 [PATCH 0/2] PCI: cadence: Set LTSSM Detect.Quiet state delay Nadeem Athani
2021-03-09  7:31 ` Nadeem Athani [this message]
2021-03-09 16:46   ` [PATCH 1/2] dt-bindings:pci: " Rob Herring
2021-03-14 18:56     ` Athani Nadeem Ladkhan
2021-03-09 17:19   ` Rob Herring
2021-03-09  7:31 ` [PATCH 2/2] PCI: cadence: " Nadeem Athani
2021-03-15 13:11   ` Kishon Vijay Abraham I

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