linux-kernel - [PATCH v4 3/8] dt-bindings: media: sun6i-a31-csi: Add MIPI CSI-2 input port

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Message-Id: <20220415152138.635525-4-paul.kocialkowski@bootlin.com>
Date:   Fri, 15 Apr 2022 17:21:33 +0200
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org
Cc:     Yong Deng <yong.deng@...ewell.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Rob Herring <robh@...nel.org>
Subject: [PATCH v4 3/8] dt-bindings: media: sun6i-a31-csi: Add MIPI CSI-2 input port

The A31 CSI controller supports two distinct input interfaces:
parallel and an external MIPI CSI-2 bridge. The parallel interface
is often connected to a set of hardware pins while the MIPI CSI-2
bridge is an internal FIFO-ish link. As a result, these two inputs
are distinguished as two different ports.

Note that only one of the two may be present on a controller instance.
For example, the V3s has one controller dedicated to MIPI-CSI2 and one
dedicated to parallel.

Update the binding with an explicit ports node that holds two distinct
port nodes: one for parallel input and one for MIPI CSI-2.

This is backward-compatible with the single-port approach that was
previously taken for representing the parallel interface port, which
stays enumerated as fwnode port 0.

Note that additional ports may be added in the future, especially to
support feeding the CSI controller's output to the ISP.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Reviewed-by: Rob Herring <robh@...nel.org>
Acked-by: Maxime Ripard <mripard@...nel.org>
---
 .../media/allwinner,sun6i-a31-csi.yaml        | 72 +++++++++++++++----
 1 file changed, 58 insertions(+), 14 deletions(-)

diff --git a/Documentation/devicetree/bindings/media/allwinner,sun6i-a31-csi.yaml b/Documentation/devicetree/bindings/media/allwinner,sun6i-a31-csi.yaml
index 8b568072a069..53aa6dbe8e2c 100644
--- a/Documentation/devicetree/bindings/media/allwinner,sun6i-a31-csi.yaml
+++ b/Documentation/devicetree/bindings/media/allwinner,sun6i-a31-csi.yaml
@@ -42,6 +42,7 @@ properties:
 
   port:
     $ref: /schemas/graph.yaml#/$defs/port-base
+    description: Parallel input port, connect to a parallel sensor
 
     properties:
       endpoint:
@@ -59,7 +60,38 @@ properties:
         required:
           - bus-width
 
-    additionalProperties: false
+    unevaluatedProperties: false
+
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    properties:
+      port@0:
+        $ref: "#/properties/port"
+
+        properties:
+          reg:
+            const: 0
+
+      port@1:
+        $ref: /schemas/graph.yaml#/$defs/port-base
+        description: MIPI CSI-2 bridge input port
+
+        properties:
+          reg:
+            const: 1
+
+          endpoint:
+            $ref: /schemas/graph.yaml#/$defs/endpoint-base
+            unevaluatedProperties: false
+
+        additionalProperties: false
+
+    anyOf:
+      - required:
+          - port@0
+      - required:
+          - port@1
 
 required:
   - compatible
@@ -69,6 +101,12 @@ required:
   - clock-names
   - resets
 
+oneOf:
+  - required:
+      - ports
+  - required:
+      - port
+
 additionalProperties: false
 
 examples:
@@ -89,19 +127,25 @@ examples:
                       "ram";
         resets = <&ccu RST_BUS_CSI>;
 
-        port {
-            /* Parallel bus endpoint */
-            csi1_ep: endpoint {
-                remote-endpoint = <&adv7611_ep>;
-                bus-width = <16>;
-
-                /*
-                 * If hsync-active/vsync-active are missing,
-                 * embedded BT.656 sync is used.
-                 */
-                 hsync-active = <0>; /* Active low */
-                 vsync-active = <0>; /* Active low */
-                 pclk-sample = <1>;  /* Rising */
+        ports {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            port@0 {
+                reg = <0>;
+                /* Parallel bus endpoint */
+                csi1_ep: endpoint {
+                    remote-endpoint = <&adv7611_ep>;
+                    bus-width = <16>;
+
+                    /*
+                     * If hsync-active/vsync-active are missing,
+                     * embedded BT.656 sync is used.
+                     */
+                    hsync-active = <0>; /* Active low */
+                    vsync-active = <0>; /* Active low */
+                    pclk-sample = <1>;  /* Rising */
+                };
             };
         };
     };
-- 
2.35.2