media: dt-bindings: Add property to describe CSI-2 C-PHY line orders

Each data lane on a CSI-2 C-PHY bus uses three phase encoding and is
constructed from three physical wires. The wires are referred to as A, B
and C and their default order is ABC. However to ease hardware design
the specification allows for the wires to be switched in any order.

Add a vendor neutral property to describe the line order used. The
property name 'line-orders', the possible values it can be assigned and
there names are taken from the MIPI Discovery and Configuration (DisCo)
Specification for Imaging.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

diff --git a/Documentation/devicetree/bindings/media/video-interfaces.yaml b/Documentation/devicetree/bindings/media/video-interfaces.yaml
index 26e3e7d7c67baba30a81feee5cdd343e8aa190d4..038e85b45befaf580e36903bbe4e048eb5c11f72 100644 (file)
--- a/Documentation/devicetree/bindings/media/video-interfaces.yaml
+++ b/Documentation/devicetree/bindings/media/video-interfaces.yaml
@@ -210,6 +210,27 @@ properties:
       lane-polarities property is omitted, the value must be interpreted as 0
       (normal). This property is valid for serial busses only.
 
+  line-orders:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    minItems: 1
+    maxItems: 8
+    items:
+      enum:
+        - 0 # ABC
+        - 1 # ACB
+        - 2 # BAC
+        - 3 # BCA
+        - 4 # CAB
+        - 5 # CBA
+    description:
+      An array of line orders of the CSI-2 C-PHY data lanes. The order of the
+      lanes are the same as in data-lanes property. Valid values are 0-5 as
+      defined in the MIPI Discovery and Configuration (DisCo) Specification for
+      Imaging. The length of the array must be the same length as the
+      data-lanes property. If the line-orders property is omitted, the value
+      shall be interpreted as 0 (ABC). This property is valid for CSI-2 C-PHY
+      busses only.
+
   strobe:
     $ref: /schemas/types.yaml#/definitions/uint32
     enum: [ 0, 1 ]

diff --git a/include/dt-bindings/media/video-interfaces.h b/include/dt-bindings/media/video-interfaces.h
index 68ac4e05e37fa06af9f6a791ac0e7b55fbf6ef34..88b9d05d80750f9af18b75433dc895faf096f2d0 100644 (file)
--- a/include/dt-bindings/media/video-interfaces.h
+++ b/include/dt-bindings/media/video-interfaces.h
@@ -13,4 +13,11 @@
 #define MEDIA_BUS_TYPE_PARALLEL                        5
 #define MEDIA_BUS_TYPE_BT656                   6
 
+#define MEDIA_BUS_CSI2_CPHY_LINE_ORDER_ABC     0
+#define MEDIA_BUS_CSI2_CPHY_LINE_ORDER_ACB     1
+#define MEDIA_BUS_CSI2_CPHY_LINE_ORDER_BAC     2
+#define MEDIA_BUS_CSI2_CPHY_LINE_ORDER_BCA     3
+#define MEDIA_BUS_CSI2_CPHY_LINE_ORDER_CAB     4
+#define MEDIA_BUS_CSI2_CPHY_LINE_ORDER_CBA     5
+
 #endif /* __DT_BINDINGS_MEDIA_VIDEO_INTERFACES_H__ */