[RFC v2] dt-binding: media: document ON Semi AR0521 sensor bindings

["Krzysztof Hałasa" <khalasa@piap.pl>]

This file documents DT bindings for the AR0521 camera sensor driver.
Changes from v1:
- added power management (power supplies).
- small fixes

The question still stands: is there a way to reliably put national
unicode characters into:
- commit messages for patches submitted via email,
- C and other source files (comments and stuff like MODULE_AUTHOR).

Yes, I know I can commit it myself correctly, but then propagating it
upstream is problematic. Perhaps a pullable tree would be better?
I guess I need to renew my old kernel.org account.

Signed-off-by: Krzysztof Halasa <khalasa@piap.pl>

diff --git a/Documentation/devicetree/bindings/media/i2c/onnn,ar0521.yaml b/Documentation/devicetree/bindings/media/i2c/onnn,ar0521.yaml
new file mode 100644
index 000000000000..29421daacc87
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/onnn,ar0521.yaml
@@ -0,0 +1,87 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/media/i2c/onnn,ar0521.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ON Semiconductor AR0521 MIPI CSI-2 sensor
+
+maintainers:
+  - Krzysztof Halasa <khalasa@piap.pl>
+
+description: |-
+  The AR0521 is a raw CMOS image sensor with MIPI CSI-2 and
+  I2C-compatible control interface.
+
+properties:
+  compatible:
+    const: onnn,ar0521
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    description: reference to the xclk clock
+    maxItems: 1
+
+  clock-names:
+    const: xclk
+
+  vdd_io-supply:
+    description:
+      Definition of the regulator used as digital I/O (1.8 V) voltage supply.
+
+  vdd_core-supply:
+    description:
+      Definition of the regulator used as digital core (1.2 V) voltage supply.
+
+  vcc_analog-supply:
+    description:
+      Definition of the regulator used as analog (2.7 V) voltage supply.
+
+  reset-gpios:
+    description: reset GPIO, usually active low
+    maxItems: 1
+
+  port:
+    $ref: /schemas/graph.yaml#/properties/port
+    description: |
+      Output video port: 1, 2 or 4 lanes.
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - port
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/clock/imx6qdl-clock.h>
+
+    i2c {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            ar0521: camera-sensor@36 {
+                    compatible = "onnn,ar0521";
+                    reg = <0x36>;
+                    pinctrl-names = "default";
+                    pinctrl-0 = <&pinctrl_mipi_camera>;
+
+                    clocks = <&clks IMX6QDL_CLK_CKO>;
+                    clock-names = "xclk";
+
+                    reset-gpios = <&gpio1 7 GPIO_ACTIVE_LOW>;
+
+                    port {
+                           mipi_camera_to_mipi_csi2: endpoint {
+                                    remote-endpoint = <&mipi_csi2_in>;
+                                    data-lanes = <1 2 3 4>;
+                            };
+                    };
+            };
+    };

-- 
Krzysztof Hałasa

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