DTSes with new i.MX 8M SoCs introduce their own compatibles so add them
to fix dtbs_check warnings like:

  arch/arm64/boot/dts/freescale/imx8mm-evk.dt.yaml: pwm@30660000:
    compatible:0: 'fsl,imx8mm-pwm' is not one of ['fsl,imx1-pwm', 'fsl,imx27-pwm']
    From schema: Documentation/devicetree/bindings/pwm/imx-pwm.yaml

  arch/arm64/boot/dts/freescale/imx8mm-evk.dt.yaml: pwm@30660000:
    compatible: ['fsl,imx8mm-pwm', 'fsl,imx27-pwm'] is too long

  arch/arm64/boot/dts/freescale/imx8mm-evk.dt.yaml: pwm@30660000:
    compatible: Additional items are not allowed ('fsl,imx27-pwm' was unexpected)

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
---
 Documentation/devicetree/bindings/pwm/imx-pwm.yaml | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/pwm/imx-pwm.yaml b/Documentation/devicetree/bindings/pwm/imx-pwm.yaml
index 01df06777cba..473863eb67e5 100644
--- a/Documentation/devicetree/bindings/pwm/imx-pwm.yaml
+++ b/Documentation/devicetree/bindings/pwm/imx-pwm.yaml

@@ -19,9 +19,17 @@ properties:
       - 3
 
   compatible:
-    enum:
-      - fsl,imx1-pwm
-      - fsl,imx27-pwm
+    oneOf:
+      - enum:
+          - fsl,imx1-pwm
+          - fsl,imx27-pwm
+      - items:
+          - enum:
+              - fsl,imx8mm-pwm
+              - fsl,imx8mn-pwm
+              - fsl,imx8mp-pwm
+              - fsl,imx8mq-pwm
+          - const: fsl,imx27-pwm
 
   reg:
     maxItems: 1

-- 
2.17.1