dt-bindings: clock: imx: Add documentation for i.MXRT1050 clock

Add DT binding documentation for i.MXRT1050 clock driver.

Cc: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Jesse Taube <Mr.Bossman075@gmail.com>
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20220111215415.2075257-5-Mr.Bossman075@gmail.comSigned-off-by: Abel Vesa <abel.vesa@nxp.com>

Documentation/devicetree/bindings/clock/imxrt1050-clock.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/imxrt1050-clock.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Clock bindings for Freescale i.MXRT
+
+maintainers:
+  - Giulio Benetti <giulio.benetti@benettiengineering.com>
+  - Jesse Taube <Mr.Bossman075@gmail.com>
+
+description: |
+  The clock consumer should specify the desired clock by having the clock
+  ID in its "clocks" phandle cell. See include/dt-bindings/clock/imxrt*-clock.h
+  for the full list of i.MXRT clock IDs.
+
+properties:
+  compatible:
+    const: fsl,imxrt1050-ccm
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 2
+
+  clocks:
+    description: 24m osc
+    maxItems: 1
+
+  clock-names:
+    const: osc
+
+  '#clock-cells':
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+  - '#clock-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/imxrt1050-clock.h>
+
+    clks: clock-controller@400fc000 {
+        compatible = "fsl,imxrt1050-ccm";
+        reg = <0x400fc000 0x4000>;
+        interrupts = <95>, <96>;
+        clocks = <&osc>;
+        clock-names = "osc";
+        #clock-cells = <1>;
+    };
+
+    lpuart1: serial@40184000 {
+        compatible = "fsl,imxrt1050-lpuart";
+        reg = <0x40184000 0x4000>;
+        interrupts = <20>;
+        clocks = <&clks IMXRT1050_CLK_LPUART1>;
+        clock-names = "ipg";
+    };