[PATCH 1/3] dt-bindings: pwm: imx-pwm: Add constraints for #pwm-cells

[Alexander Stein]

Only fsl,imx1-pwm comptabile devices use #pwm-cells = <2>. Newer SoCs
supportinverted PWM output, thus #pwm-cells needs to be set to 3.

Signed-off-by: Alexander Stein <alexander.stein at ew.tq-group.com>
---
 .../devicetree/bindings/pwm/imx-pwm.yaml      | 20 ++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/pwm/imx-pwm.yaml b/Documentation/devicetree/bindings/pwm/imx-pwm.yaml
index c01dff3b7f843..59a981c0f39ab 100644
--- a/Documentation/devicetree/bindings/pwm/imx-pwm.yaml
+++ b/Documentation/devicetree/bindings/pwm/imx-pwm.yaml
@@ -9,9 +9,6 @@ title: Freescale i.MX PWM controller
 maintainers:
   - Philipp Zabel <p.zabel at pengutronix.de>
 
-allOf:
-  - $ref: pwm.yaml#
-
 properties:
   "#pwm-cells":
     description: |
@@ -74,6 +71,23 @@ required:
 
 additionalProperties: false
 
+allOf:
+  - $ref: pwm.yaml#
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: fsl,imx1-pwm
+    then:
+      properties:
+        "#pwm-cells":
+          enum: [2]
+    else:
+      properties:
+        "#pwm-cells":
+          enum: [3]
+
 examples:
   - |
     #include <dt-bindings/clock/imx5-clock.h>
-- 
2.34.1