linux-kernel - [PATCH V2 2/2] schemas: pci: bridge: Document PCIe N

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Message-Id: <20250124101038.3871768-3-krishna.chundru@oss.qualcomm.com>
Date: Fri, 24 Jan 2025 15:40:38 +0530
From: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
To: andersson@...nel.org, robh@...nel.org, dmitry.baryshkov@...aro.org,
        manivannan.sadhasivam@...aro.org, krzk@...nel.org, helgaas@...nel.org
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        lpieralisi@...nel.org, kw@...ux.com, conor+dt@...nel.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree-spec@...r.kernel.org, quic_vbadigan@...cinc.com,
        Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
Subject: [PATCH V2 2/2] schemas: pci: bridge: Document PCIe N_FTS

Per PCIe r6.0, sec 4.2.5.1, during Link training, a PCIe component
captures the N_FTS value it receives.  Per 4.2.5.6, when
transitioning the Link from L0s to L0, it must transmit N_FTS Fast
Training Sequences to enable the receiver to obtain bit and Symbol
lock.

Components may have device-specific ways to configure N_FTS values
to advertise during Link training.  Define an n_fts array with an
entry for each supported data rate.

Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
---
 dtschema/schemas/pci/pci-bus-common.yaml | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/dtschema/schemas/pci/pci-bus-common.yaml b/dtschema/schemas/pci/pci-bus-common.yaml
index a9309af..968df43 100644
--- a/dtschema/schemas/pci/pci-bus-common.yaml
+++ b/dtschema/schemas/pci/pci-bus-common.yaml
@@ -128,6 +128,15 @@ properties:
     $ref: /schemas/types.yaml#/definitions/uint32
     enum: [ 1, 2, 4, 8, 16, 32 ]
 
+  n-fts:
+    description:
+      The number of Fast Training Sequences (N_FTS) required by the
+      Receiver (this component) when transitioning the Link from L0s
+      to L0; advertised during initial Link training
+    $ref: /schemas/types.yaml#/definitions/uint8-array
+    minItems: 1
+    maxItems: 5
+
   reset-gpios:
     description: GPIO controlled connection to PERST# signal
     maxItems: 1
-- 
2.34.1