[PATCH v6 1/4] dt-bindings: media: add Maxim MAX96717 GMSL2 Serializer

[Julien Massot <julien.massot@collabora.com>]

Add DT bindings for Maxim MAX96717 GMSL2 Serializer.

Signed-off-by: Julien Massot <julien.massot@collabora.com>
---
Change since v5:
 - Reverse the fallback MAX96717 can fallback to MAX96717F
 - Use const instead of enum for MAX96717F compatible
 
Change since v4:
 - Add compatible for MAX96717 and use it as a fallback for MAX96717F
 - Remove extra '|' for decriptions
 - Reference 'i2c-gate' instead of 'i2c-controller'

Change since v3:
 - Renamed file to maxim,max96717.yaml dropped the 'f' suffix
 - Added lane-polarities and bus type properties to the CSI endpoint

Change since v2:
 - remove reg description
 - add data lanes min/maxItems
 - Use generic node name 
---
 .../bindings/media/i2c/maxim,max96717.yaml    | 164 ++++++++++++++++++
 1 file changed, 164 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/maxim,max96717.yaml

diff --git a/Documentation/devicetree/bindings/media/i2c/maxim,max96717.yaml b/Documentation/devicetree/bindings/media/i2c/maxim,max96717.yaml
new file mode 100644
index 000000000000..ac8bf11a6fa5
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/maxim,max96717.yaml
@@ -0,0 +1,164 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (C) 2024 Collabora Ltd.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/media/i2c/maxim,max96717.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MAX96717 CSI-2 to GMSL2 Serializer
+
+maintainers:
+  - Julien Massot <julien.massot@collabora.com>
+
+description:
+  The MAX96717 serializer converts MIPI CSI-2 D-PHY or C-PHY formatted input
+  into GMSL2 serial outputs. The device allows the GMSL2 link to
+  simultaneously transmit bidirectional control-channel data while forward
+  video transmissions are in progress. The MAX96717 can connect to one
+  remotely located deserializer using industry-standard coax or STP
+  interconnects. The device cans operate in pixel or tunnel mode. In pixel mode
+  the MAX96717 can select the MIPI datatype, while the tunnel mode forward all the MIPI
+  data received by the serializer.
+  The MAX96717 supports Reference Over Reverse (channel),
+  to generate a clock output for the sensor from the GMSL reverse channel.
+
+  The GMSL2 serial link operates at a fixed rate of 3Gbps or 6Gbps in the
+  forward direction and 187.5Mbps in the reverse direction.
+  MAX96717F only supports a fixed rate of 3Gbps in the forward direction.
+
+properties:
+  compatible:
+    oneOf:
+      - const: maxim,max96717f
+      - items:
+          - enum:
+              - maxim,max96717
+          - const: maxim,max96717f
+
+  '#gpio-cells':
+    const: 2
+    description:
+      First cell is the GPIO pin number, second cell is the flags. The GPIO pin
+      number must be in range of [0, 10].
+
+  gpio-controller: true
+
+  '#clock-cells':
+    const: 0
+
+  reg:
+    maxItems: 1
+
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    properties:
+      port@0:
+        $ref: /schemas/graph.yaml#/$defs/port-base
+        unevaluatedProperties: false
+        description: CSI-2 Input port
+
+        properties:
+          endpoint:
+            $ref: /schemas/media/video-interfaces.yaml#
+            unevaluatedProperties: false
+
+            properties:
+              data-lanes:
+                minItems: 1
+                maxItems: 4
+
+              lane-polarities:
+                minItems: 1
+                maxItems: 5
+
+              bus-type:
+                enum:
+                  - 1 # MEDIA_BUS_TYPE_CSI2_CPHY
+                  - 4 # MEDIA_BUS_TYPE_CSI2_DPHY
+
+            required:
+              - data-lanes
+              - bus-type
+
+      port@1:
+        $ref: /schemas/graph.yaml#/properties/port
+        unevaluatedProperties: false
+        description: GMSL Output port
+
+    required:
+      - port@1
+
+  i2c-gate:
+    $ref: /schemas/i2c/i2c-gate.yaml
+    unevaluatedProperties: false
+    description:
+      The MAX96717 will forward the I2C requests from the
+      incoming GMSL2 link. Therefore, it supports an i2c-gate
+      subnode to configure a sensor.
+
+required:
+  - compatible
+  - reg
+  - ports
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/media/video-interfaces.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        serializer: serializer@40 {
+            compatible = "maxim,max96717f";
+            reg = <0x40>;
+            gpio-controller;
+            #gpio-cells = <2>;
+            #clock-cells = <0>;
+
+            ports {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                port@0 {
+                    reg = <0>;
+                    max96717f_csi_in: endpoint {
+                        bus-type = <MEDIA_BUS_TYPE_CSI2_DPHY>;
+                        data-lanes = <1 2 3 4>;
+                        remote-endpoint = <&sensor_out>;
+                    };
+                };
+
+                port@1 {
+                    reg = <1>;
+                    max96917f_gmsl_out: endpoint {
+                        remote-endpoint = <&deser_gmsl_in>;
+                    };
+                };
+            };
+
+            i2c-gate {
+                #address-cells = <1>;
+                #size-cells = <0>;
+                sensor@10 {
+                    compatible = "st,st-vgxy61";
+                    reg = <0x10>;
+                    reset-gpios = <&serializer 0 GPIO_ACTIVE_LOW>;
+                    clocks = <&serializer>;
+                    VCORE-supply = <&v1v2>;
+                    VDDIO-supply = <&v1v8>;
+                    VANA-supply = <&v2v8>;
+                    port {
+                        sensor_out: endpoint {
+                            data-lanes = <1 2 3 4>;
+                            remote-endpoint = <&max96717f_csi_in>;
+                        };
+                    };
+                };
+            };
+        };
+    };
+...
-- 
2.44.0