linux-kernel - [PATCH] dt-bindings: PCI: mediatek,mt7621-pcie: add PCIe host topology ascii graph

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Date: Wed, 22 May 2024 06:43:21 +0200
From: Sergio Paracuellos <sergio.paracuellos@...il.com>
To: devicetree@...r.kernel.org
Cc: linux-pci@...r.kernel.org,
	krzk+dt@...nel.org,
	robh@...nel.org,
	kw@...ux.com,
	lpieralisi@...nel.org,
	bhelgaas@...gle.com,
	conor+dt@...nel.org,
	angelogioacchino.delregno@...labora.com,
	linux-kernel@...r.kernel.org,
	Krzysztof Kozlowski <krzk@...nel.org>
Subject: [PATCH] dt-bindings: PCI: mediatek,mt7621-pcie: add PCIe host topology ascii graph

MediaTek MT7621 PCIe subsys supports a single Root Complex (RC) with 3 Root
Ports. Add PCIe host topology ascii graph to the binding for completeness.

Suggested-by: Krzysztof Kozlowski <krzk@...nel.org>
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@...il.com>
---
 .../bindings/pci/mediatek,mt7621-pcie.yaml    | 29 +++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/mediatek,mt7621-pcie.yaml b/Documentation/devicetree/bindings/pci/mediatek,mt7621-pcie.yaml
index 6fba42156db6..c41608863d6c 100644
--- a/Documentation/devicetree/bindings/pci/mediatek,mt7621-pcie.yaml
+++ b/Documentation/devicetree/bindings/pci/mediatek,mt7621-pcie.yaml
@@ -13,6 +13,35 @@ description: |+
   MediaTek MT7621 PCIe subsys supports a single Root Complex (RC)
   with 3 Root Ports. Each Root Port supports a Gen1 1-lane Link
 
+                          MT7621 PCIe HOST Topology
+
+                                   .-------.
+                                   |       |
+                                   |  CPU  |
+                                   |       |
+                                   '-------'
+                                       |
+                                       |
+                                       |
+                                       v
+                              .------------------.
+                  .-----------|  HOST/PCI Bridge |------------.
+                  |           '------------------'            | Type1
+             BUS0 |                     |                     | Access
+                  v                     v                     v On Bus0
+          .-------------.        .-------------.       .-------------.
+          | VIRTUAL P2P |        | VIRTUAL P2P |       | VIRTUAL P2P |
+          |    BUS0     |        |    BUS0     |       |    BUS0     |
+          |    DEV0     |        |    DEV1     |       |    DEV2     |
+          '-------------'        '-------------'       '-------------'
+    Type0        |          Type0       |         Type0       |
+   Access   BUS1 |         Access   BUS2|        Access   BUS3|
+   On Bus1       v         On Bus2      v        On Bus3      v
+           .----------.           .----------.          .----------.
+           | Device 0 |           | Device 0 |          | Device 0 |
+           |  Func 0  |           |  Func 0  |          |  Func 0  |
+           '----------'           '----------'          '----------'
+
 allOf:
   - $ref: /schemas/pci/pci-host-bridge.yaml#
 
-- 
2.25.1