linux-kernel - [PATCH 1/2] dt-bindings:pci: Set LTSSM Detect.Quiet state delay.

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Date:   Tue, 9 Mar 2021 08:31:41 +0100
From:   Nadeem Athani <nadeem@...ence.com>
To:     <tjoseph@...ence.com>, <bhelgaas@...gle.com>, <robh+dt@...nel.org>,
        <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <lorenzo.pieralisi@....com>,
        <robh@...nel.org>, <kishon@...com>
CC:     <mparab@...ence.com>, <sjakhade@...ence.com>, <nadeem@...ence.com>,
        <pthombar@...ence.com>
Subject: [PATCH 1/2] dt-bindings:pci: Set LTSSM Detect.Quiet state delay.

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@...ence.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