[PATCH v3 2/3] media: dt-bindings: alvium: add document YAML binding

[Tommaso Merciai]

Add documentation of device tree in YAML schema for the ALVIUM
Camera from Allied Vision Inc.

References:
 - https://www.alliedvision.com/en/products/embedded-vision-solutions

Signed-off-by: Tommaso Merciai <tomm.merciai@xxxxxxxxx>
---
Changes since v1:
 - Fixed build error as suggested by RHerring bot

Changes since v2:
 - Fixed License as suggested by KKozlowski/CDooley
 - Removed rotation property as suggested by CDooley/LPinchart
 - Fixed example node name as suggested by CDooley
 - Fixed title as suggested by LPinchart
 - Fixed compatible name as suggested by LPinchart
 - Removed clock as suggested by LPinchart
 - Removed gpios not as suggested by LPinchart
 - Renamed property name streamon-delay into alliedvision,lp2hs-delay-us
 - Fixed vendor prefix, unit append as suggested by KKozlowski
 - Fixed data-lanes
 - Fixed blank space + example indentation (from 6 -> 4 space) as suggested by KKozlowski
 - Dropped status into example  as suggested by KKozlowski
 - Added vcc-ext-in supply as suggested by LPinchart
 - Dropped pinctrl into example as suggested by LPinchart

 .../media/i2c/alliedvision,alvium-csi2.yaml   | 93 +++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/alliedvision,alvium-csi2.yaml

diff --git a/Documentation/devicetree/bindings/media/i2c/alliedvision,alvium-csi2.yaml b/Documentation/devicetree/bindings/media/i2c/alliedvision,alvium-csi2.yaml
new file mode 100644
index 000000000000..191534e2f7bd
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/alliedvision,alvium-csi2.yaml
@@ -0,0 +1,93 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/media/i2c/alliedvision,alvium.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Allied Vision Alvium Camera
+
+maintainers:
+  - Tommaso Merciai <tomm.merciai@xxxxxxxxx>
+  - Martin Hecht <martin.hecht@xxxxxxxx>
+
+allOf:
+  - $ref: /schemas/media/video-interface-devices.yaml#
+
+properties:
+  compatible:
+    const: alliedvision,alvium-csi2
+
+  reg:
+    maxItems: 1
+
+  vcc-ext-in-supply:
+    description:
+      Definition of the regulator used as interface power supply.
+
+  alliedvision,lp2hs-delay-us:
+    maxItems: 1
+    description:
+      Low power to high speed delay time in microseconds.
+      The purpose of this property is force a DPhy reset for the period
+      described by the microseconds on the property, before it starts
+      streaming. To be clear, with that value bigger than 0 the Alvium
+      forces a dphy-reset on all lanes for that period. That means all
+      lanes go up into low power state. This may help a csi2 rx ip to
+      reset if that IP can't deal with a continous clock.
+
+  port:
+    description: Digital Output Port
+    $ref: /schemas/graph.yaml#/$defs/port-base
+    additionalProperties: false
+
+    properties:
+      endpoint:
+        $ref: /schemas/media/video-interfaces.yaml#
+        unevaluatedProperties: false
+
+        properties:
+          link-frequencies: true
+
+          data-lanes:
+            minItems: 1
+            items:
+              - const: 1
+              - const: 2
+              - const: 3
+              - const: 4
+
+        required:
+          - data-lanes
+          - link-frequencies
+
+required:
+  - compatible
+  - reg
+  - vcc-ext-in-supply
+  - port
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        alvium: camera@3c {
+            compatible = "alliedvision,alvium-csi2";
+            reg = <0x3c>;
+            vcc-ext-in-supply = <&reg_vcc_ext_in>;
+            alliedvision,lp2hs-delay-us = <20>;
+
+            port {
+                alvium_out: endpoint {
+                    remote-endpoint = <&mipi_csi_0_in>;
+                    data-lanes = <1 2 3 4>;
+                    link-frequencies = /bits/ 64 <681250000>;
+                };
+            };
+        };
+    };
+
+...
-- 
2.34.1