diff mbox series

[v5,1/6] dt-bindings: media: sun6i-a31-csi: Add MIPI CSI-2 input port

Message ID 20220525190300.696269-2-paul.kocialkowski@bootlin.com
State Accepted
Commit 249106dadd207a5666c0b2167d7421052934e028
Headers show
Series Allwinner A31/A83T MIPI CSI-2 and A31 ISP / MIPI CSI-2 Support | expand

Commit Message

Paul Kocialkowski May 25, 2022, 7:02 p.m. UTC 
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@bootlin.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Maxime Ripard <mripard@kernel.org>
---
 .../media/allwinner,sun6i-a31-csi.yaml        | 58 ++++++++++++++-----
 1 file changed, 44 insertions(+), 14 deletions(-)
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/media/allwinner,sun6i-a31-csi.yaml b/Documentation/devicetree/bindings/media/allwinner,sun6i-a31-csi.yaml
index 8b568072a069..8551c4a711dc 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 +60,24 @@  properties:
         required:
           - bus-width
 
-    additionalProperties: false
+    unevaluatedProperties: false
+
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    properties:
+      port@0:
+        $ref: "#/properties/port"
+
+      port@1:
+        $ref: /schemas/graph.yaml#/properties/port
+        description: MIPI CSI-2 bridge input port
+
+    anyOf:
+      - required:
+          - port@0
+      - required:
+          - port@1
 
 required:
   - compatible
@@ -69,6 +87,12 @@  required:
   - clock-names
   - resets
 
+oneOf:
+  - required:
+      - ports
+  - required:
+      - port
+
 additionalProperties: false
 
 examples:
@@ -89,19 +113,25 @@  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 */
+                };
             };
         };
     };