Le jeudi 28 octobre 2021 à 21:13 -0500, Rob Herring a écrit :

On Sun, Oct 24, 2021 at 10:58:39AM +0200, Vincent Knecht wrote:

quoted

Add optional rcv-gpios property specific to tfa9897 receiver mode.

Signed-off-by: Vincent Knecht <redacted>
---
 .../devicetree/bindings/sound/nxp,tfa989x.yaml         | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/devicetree/bindings/sound/nxp,tfa989x.yaml

b/Documentation/devicetree/bindings/sound/nxp,tfa989x.yaml
index 7667471be1e4..a9e15baedafd 100644

--- a/Documentation/devicetree/bindings/sound/nxp,tfa989x.yaml
+++ b/Documentation/devicetree/bindings/sound/nxp,tfa989x.yaml

@@ -12,6 +12,16 @@ maintainers:

 allOf:
   - $ref: name-prefix.yaml#
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: nxp,tfa9897
+    then:
+      properties:
+        rcv-gpios:
+          description: optional GPIO to be asserted when receiver mode is enabled.

Did you test this works? 

You have to define the property outside the if/then schema at the top 
level. Then use an if/then schema to restrict it (rcv-gpios: false).

Sorry, I only tested validation with dt_binding_check.

I'll send another version later today with
if:
  not:
    properties:
      compatible:
        const: nxp,tfa9897
then:
  properties:
    rcv-gpios: false
and a tfa9897 example section, which passes the check and fails
if rcv-gpio is added to tfa9895.

Thank you