Add binding doc for reset controller of i.MX8QM and i.MX8QXP, which use
System Controller Firmware(SCU) reset some peripherals, such as CSI.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
---
 .../devicetree/bindings/reset/fsl,imx-scu.yaml     | 35 ++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/Documentation/devicetree/bindings/reset/fsl,imx-scu.yaml b/Documentation/devicetree/bindings/reset/fsl,imx-scu.yaml
new file mode 100644
index 0000000000000..6046df8723262
--- /dev/null
+++ b/Documentation/devicetree/bindings/reset/fsl,imx-scu.yaml

@@ -0,0 +1,35 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/reset/fsl,imx-scu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Freescale i.MX8 SCU Reset
+
+maintainers:
+  - Frank Li <Frank.Li@nxp.com>
+
+description:
+  i.MX8QM and i.MX8QXP System Controller Firmware(SCU) provide reset for
+  some peripheral.
+
+properties:
+  compatible:
+    enum:
+      - fsl,imx-scu-reset
+
+  '#reset-cells':
+    const: 1
+
+required:
+  - compatible
+  - '#reset-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    reset-controller {
+        compatible = "fsl,imx-scu-reset";
+        #reset-cells = <1>;