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Message-ID: <20240819223834.2049862-13-swboyd@chromium.org>
Date: Mon, 19 Aug 2024 15:38:26 -0700
From: Stephen Boyd <swboyd@...omium.org>
To: chrome-platform@...ts.linux.dev
Cc: linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev,
	devicetree@...r.kernel.org,
	Douglas Anderson <dianders@...omium.org>,
	Pin-yen Lin <treapking@...omium.org>,
	Andrzej Hajda <andrzej.hajda@...el.com>,
	Benson Leung <bleung@...omium.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Daniel Vetter <daniel@...ll.ch>,
	David Airlie <airlied@...il.com>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	dri-devel@...ts.freedesktop.org,
	Guenter Roeck <groeck@...omium.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Jonas Karlman <jonas@...boo.se>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	Lee Jones <lee@...nel.org>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Prashant Malani <pmalani@...omium.org>,
	Robert Foss <rfoss@...nel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Tzung-Bi Shih <tzungbi@...nel.org>,
	Alexandre Belloni <alexandre.belloni@...tlin.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Daniel Scally <djrscally@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Ivan Orlov <ivan.orlov0322@...il.com>,
	linux-acpi@...r.kernel.org,
	linux-usb@...r.kernel.org,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Vinod Koul <vkoul@...nel.org>
Subject: [PATCH v3 12/17] dt-bindings: usb-switch: Extend for DisplayPort altmode

Extend the usb-switch binding to support DisplayPort (DP) alternate
modes. A third port for the DP signal is necessary when a mode-switch is
muxing USB and DP together onto a usb type-c connector. Add data-lanes
to the usbc output node to allow a device using this binding to remap
the data lanes on the output. Add an example to show how this new port
can be used.

Cc: Rob Herring <robh+dt@...nel.org>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc: Conor Dooley <conor+dt@...nel.org>
Cc: Benson Leung <bleung@...omium.org>
Cc: Guenter Roeck <groeck@...omium.org>
Cc: Prashant Malani <pmalani@...omium.org>
Cc: Tzung-Bi Shih <tzungbi@...nel.org>
Cc: <devicetree@...r.kernel.org>
Cc: <chrome-platform@...ts.linux.dev>
Cc: Pin-yen Lin <treapking@...omium.org>
Signed-off-by: Stephen Boyd <swboyd@...omium.org>
---
 .../devicetree/bindings/usb/usb-switch.yaml   | 90 +++++++++++++++++++
 1 file changed, 90 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/usb-switch.yaml b/Documentation/devicetree/bindings/usb/usb-switch.yaml
index 5fc031b56fad..7a932c638a90 100644
--- a/Documentation/devicetree/bindings/usb/usb-switch.yaml
+++ b/Documentation/devicetree/bindings/usb/usb-switch.yaml
@@ -54,6 +54,15 @@ properties:
             $ref: '#/$defs/usbc-in-endpoint'
             unevaluatedProperties: false
 
+      port@2:
+        $ref: /schemas/graph.yaml#/$defs/port-base
+        unevaluatedProperties: false
+
+        properties:
+          endpoint:
+            $ref: '#/$defs/dp-endpoint'
+            unevaluatedProperties: false
+
 oneOf:
   - required:
       - port
@@ -67,6 +76,19 @@ $defs:
     $ref: /schemas/graph.yaml#/$defs/endpoint-base
     description: Super Speed (SS) output endpoint to a type-c connector
     unevaluatedProperties: false
+    properties:
+      data-lanes:
+        $ref: /schemas/types.yaml#/definitions/uint32-array
+        description: |
+          An array of physical USB Type-C data lane indexes.
+          - 0 is SSRX1 lane
+          - 1 is SSTX1 lane
+          - 2 is SSTX2 lane
+          - 3 is SSRX2 lane
+        minItems: 4
+        maxItems: 4
+        items:
+          maximum: 3
 
   usbc-in-endpoint:
     $ref: /schemas/graph.yaml#/$defs/endpoint-base
@@ -81,7 +103,75 @@ $defs:
         items:
           maximum: 8
 
+  dp-endpoint:
+    $ref: /schemas/graph.yaml#/$defs/endpoint-base
+    description: DisplayPort (DP) input from the DP PHY
+    unevaluatedProperties: false
+    properties:
+      data-lanes:
+        $ref: /schemas/types.yaml#/definitions/uint32-array
+        description: |
+          An array of physical DP data lane indexes
+          - 0 is DP ML0 lane
+          - 1 is DP ML1 lane
+          - 2 is DP ML2 lane
+          - 3 is DP ML3 lane
+        oneOf:
+          - items:
+              - const: 0
+              - const: 1
+          - items:
+              - const: 0
+              - const: 1
+              - const: 2
+              - const: 3
+
 examples:
+  # A USB + DP mode and orientation switch which muxes DP altmode
+  # and USB onto a usb-c-connector node.
+  - |
+    device {
+      mode-switch;
+      orientation-switch;
+
+      ports {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        port@0 {
+          reg = <0>;
+          #address-cells = <1>;
+          #size-cells = <0>;
+
+          endpoint {
+            remote-endpoint = <&usb_c_connector>;
+            data-lanes = <0 1 2 3>;
+          };
+        };
+
+        port@1 {
+          reg = <1>;
+          #address-cells = <1>;
+          #size-cells = <0>;
+
+          endpoint {
+            remote-endpoint = <&usb_ss_phy>;
+          };
+        };
+
+        port@2 {
+          reg = <2>;
+          #address-cells = <1>;
+          #size-cells = <0>;
+
+          endpoint {
+            remote-endpoint = <&dp_phy>;
+            data-lanes = <0 1 2 3>;
+          };
+        };
+      };
+    };
+
   # A USB orientation switch which flips the pin orientation
   # for a usb-c-connector node.
   - |
-- 
https://chromeos.dev


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