media: dt-bindings: media: imx258: add bindings for IMX258 sensor

Add bindings for the IMX258 camera sensor.  The bindings, just like the
driver, are quite limited, e.g. do not support regulator supplies.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

Documentation/devicetree/bindings/media/i2c/imx258.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/media/i2c/imx258.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Sony IMX258 13 Mpixel CMOS Digital Image Sensor
+
+maintainers:
+  - Krzysztof Kozlowski <krzk@kernel.org>
+
+description: |-
+  IMX258 is a diagonal 5.867mm (Type 1/3.06) 13 Mega-pixel CMOS active pixel
+  type stacked image sensor with a square pixel array of size 4208 x 3120. It
+  is programmable through I2C interface.  Image data is sent through MIPI
+  CSI-2.
+
+properties:
+  compatible:
+    const: sony,imx258
+
+  assigned-clocks: true
+  assigned-clock-parents: true
+  assigned-clock-rates: true
+
+  clocks:
+    description:
+      Clock frequency from 6 to 27 MHz.
+    maxItems: 1
+
+  reg:
+    maxItems: 1
+
+  reset-gpios:
+    description: |-
+      Reference to the GPIO connected to the XCLR pin, if any.
+
+  vana-supply:
+    description:
+      Analog voltage (VANA) supply, 2.7 V
+
+  vdig-supply:
+    description:
+      Digital I/O voltage (VDIG) supply, 1.2 V
+
+  vif-supply:
+    description:
+      Interface voltage (VIF) supply, 1.8 V
+
+  # See ../video-interfaces.txt for more details
+  port:
+    type: object
+    properties:
+      endpoint:
+        type: object
+        properties:
+          data-lanes:
+            oneOf:
+              - items:
+                  - const: 1
+                  - const: 2
+                  - const: 3
+                  - const: 4
+              - items:
+                  - const: 1
+                  - const: 2
+
+          link-frequencies:
+            allOf:
+              - $ref: /schemas/types.yaml#/definitions/uint64-array
+            description:
+              Allowed data bus frequencies.
+
+        required:
+          - data-lanes
+          - link-frequencies
+
+required:
+  - compatible
+  - reg
+  - port
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c0 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        sensor@6c {
+            compatible = "sony,imx258";
+            reg = <0x6c>;
+            clocks = <&imx258_clk>;
+
+            port {
+                endpoint {
+                    remote-endpoint = <&csi1_ep>;
+                    data-lanes = <1 2 3 4>;
+                    link-frequencies = /bits/ 64 <320000000>;
+                };
+            };
+        };
+    };
+
+    /* Oscillator on the camera board */
+    imx258_clk: clk {
+        compatible = "fixed-clock";
+        #clock-cells = <0>;
+        clock-frequency = <19200000>;
+    };
+
+  - |
+    i2c0 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        sensor@6c {
+            compatible = "sony,imx258";
+            reg = <0x6c>;
+            clocks = <&imx258_clk>;
+
+            assigned-clocks = <&imx258_clk>;
+            assigned-clock-rates = <19200000>;
+
+            port {
+                endpoint {
+                    remote-endpoint = <&csi1_ep>;
+                    data-lanes = <1 2 3 4>;
+                    link-frequencies = /bits/ 64 <633600000>;
+                };
+            };
+        };
+    };

MAINTAINERS

@@ -16559,6 +16559,7 @@ M:	Sakari Ailus <sakari.ailus@linux.intel.com>
 L:	linux-media@vger.kernel.org
 S:	Maintained
 T:	git git://linuxtv.org/media_tree.git
+F:	Documentation/devicetree/bindings/media/i2c/imx258.yaml
 F:	drivers/media/i2c/imx258.c
 
 SONY IMX274 SENSOR DRIVER