dt-bindings: clock: fsl-sai: Document i.MX8M support

The i.MX8M/Mini/Nano/Plus variant of the SAI IP has control registers
shifted by +8 bytes and requires additional bus clock. Document support
for the i.MX8M variant of the IP with this register shift and additional
clock. Update the description slightly.

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Marek Vasut <marex@nabladev.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: Marek Vasut

Documentation/devicetree/bindings/clock/fsl,sai-clock.yaml

@@ -10,28 +10,57 @@ maintainers:
   - Michael Walle <michael@walle.cc>
 
 description: |
-  It is possible to use the BCLK pin of a SAI module as a generic clock
-  output. Some SoC are very constrained in their pin multiplexer
-  configuration. Eg. pins can only be changed groups. For example, on the
-  LS1028A SoC you can only enable SAIs in pairs. If you use only one SAI,
+  It is possible to use the BCLK pin of a SAI module as a generic
+  clock output. Some SoC are very constrained in their pin multiplexer
+  configuration. E.g. pins can only be changed in groups. For example, on
+  the LS1028A SoC you can only enable SAIs in pairs. If you use only one SAI,
   the second pins are wasted. Using this binding it is possible to use the
   clock of the second SAI as a MCLK clock for an audio codec, for example.
 
   This is a composite of a gated clock and a divider clock.
 
 properties:
   compatible:
-    const: fsl,vf610-sai-clock
+    oneOf:
+      - items:
+          - enum:
+              - fsl,imx8mm-sai-clock
+              - fsl,imx8mn-sai-clock
+              - fsl,imx8mp-sai-clock
+          - const: fsl,imx8mq-sai-clock
+      - items:
+          - enum:
+              - fsl,imx8mq-sai-clock
+              - fsl,vf610-sai-clock
 
   reg:
     maxItems: 1
 
   clocks:
-    maxItems: 1
+    minItems: 1
+    maxItems: 2
+
+  clock-names:
+    minItems: 1
+    items:
+      - const: bus
+      - const: mclk1
 
   '#clock-cells':
     const: 0
 
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: fsl,vf610-sai-clock
+    then:
+      properties:
+        clocks:
+          maxItems: 1
+        clock-names: false
+
 required:
   - compatible
   - reg