linux-kernel - [PATCH 1/4] dt-bindings: display: bridge: add the Hot-plug MIPI DSI connector

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Message-Id: <20240326-hotplug-drm-bridge-v1-1-4b51b5eb75d5@bootlin.com>
Date: Tue, 26 Mar 2024 17:28:11 +0100
From: Luca Ceresoli <luca.ceresoli@...tlin.com>
To: Andrzej Hajda <andrzej.hajda@...el.com>, 
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>, 
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>, 
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>, 
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 Rob Herring <robh+dt@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: Paul Kocialkowski <contact@...lk.fr>, 
 Hervé Codina <herve.codina@...tlin.com>, 
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Paul Kocialkowski <paul.kocialkowski@...tlin.com>, 
 Luca Ceresoli <luca.ceresoli@...tlin.com>
Subject: [PATCH 1/4] dt-bindings: display: bridge: add the Hot-plug MIPI
 DSI connector

Add bindings for a physical, hot-pluggable connector allowing the far end
of a MIPI DSI bus to be connected and disconnected at runtime.

Signed-off-by: Luca Ceresoli <luca.ceresoli@...tlin.com>
---
 .../bridge/hotplug-video-connector-dsi.yaml        | 87 ++++++++++++++++++++++
 MAINTAINERS                                        |  5 ++
 2 files changed, 92 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/bridge/hotplug-video-connector-dsi.yaml b/Documentation/devicetree/bindings/display/bridge/hotplug-video-connector-dsi.yaml
new file mode 100644
index 000000000000..05beb8aa9ab4
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/bridge/hotplug-video-connector-dsi.yaml
@@ -0,0 +1,87 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/bridge/hotplug-video-connector-dsi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Hot-pluggable connector on a MIPI DSI bus
+
+maintainers:
+  - Luca Ceresoli <luca.ceresoli@...tlin.com>
+
+description:
+  A bridge representing a physical, hot-pluggable connector on a MIPI DSI
+  video bus. The connector splits the video pipeline in a fixed part and a
+  removable part.
+
+  The fixed part of the video pipeline includes all components up to the
+  display controller and 0 or more bridges. The removable part includes one
+  or more bridges and any other components up to the panel.
+
+  The removable part of the pipeline can be physically disconnected at any
+  moment, making all of its components not usable anymore. The same or a
+  different removable part of the pipeline can be reconnected later on.
+
+  Note that the hotplug-video-connector does not describe video busses
+  having native hotplug capabilities in the hardware, such as HDMI.
+
+properties:
+  compatible:
+    const: hotplug-video-connector-dsi
+
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    properties:
+      port@0:
+        $ref: /schemas/graph.yaml#/properties/port
+        description:
+          The end of the fixed part of the MIPI DSI bus (terminating at the
+          hotplug connector). The remote-endpoint sub-node must point to
+          the previous component of the video pipeline.
+
+      port@1:
+        $ref: /schemas/graph.yaml#/properties/port
+        description:
+          The start of the removable part of the MIPI DSI bus (starting
+          from the hotplug connector). The remote-endpoint sub-node must
+          point to the next component of the video pipeline.
+
+    required:
+      - port@0
+      - port@1
+
+required:
+  - compatible
+  - ports
+
+additionalProperties: false
+
+examples:
+  - |
+    hotplug-video-connector {
+        compatible = "hotplug-video-connector-dsi";
+
+        ports {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            port@0 {
+                reg = <0>;
+
+                hotplug_connector_in: endpoint {
+                    remote-endpoint = <&previous_bridge_out>;
+                };
+            };
+
+            port@1 {
+                reg = <1>;
+
+                hotplug_connector_out: endpoint {
+                    remote-endpoint = <&next_bridge_in>;
+                };
+            };
+        };
+    };
+
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index aa3b947fb080..e1affd13e30b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6716,6 +6716,11 @@ T:	git git://anongit.freedesktop.org/drm/drm-misc
 F:	Documentation/devicetree/bindings/display/panel/himax,hx8394.yaml
 F:	drivers/gpu/drm/panel/panel-himax-hx8394.c
 
+DRM DRIVER FOR HOTPLUG VIDEO CONNECTOR BRIDGE
+M:	Luca Ceresoli <luca.ceresoli@...tlin.com>
+S:	Maintained
+F:	Documentation/devicetree/bindings/display/bridge/hotplug-video-connector-dsi.yaml
+
 DRM DRIVER FOR HX8357D PANELS
 S:	Orphan
 T:	git git://anongit.freedesktop.org/drm/drm-misc

-- 
2.34.1