[PATCH v4 3/6] dt-bindings: net: nfc: samsung,s3fwrn5: add the S3NRN4V

The S3NRN4V is a later part in the Samsung NCI NFC controller line
this binding documents, found e.g. on the Fairphone 6 (SM7635). Its
host interface is NCI over I2C like the S3FWRN5, but it is not
compatible with any of the existing parts, so no fallback compatible
applies: its bootloader reports a hardware version none of the
existing parts use, and its RF configuration is loaded through a
different proprietary command set.

Also document the PVDD supply, the externally switched rail powering
the controller (boards feed it from a PMIC LDO). It is required for the
new device; deployed DTs for the existing parts never described a
supply, so for those it stays optional.

Assisted-by: Claude:claude-opus-4-8
Assisted-by: Claude:claude-fable-5
Signed-off-by: Jorijn van der Graaf <[email protected]>
---
Conor's Acked-by, given on v2 and carried into v3, is dropped: this
version removes clk-req-gpios (and its dependencies clause) and the
S3NRN4V example. The compatible and pvdd-supply hunks are unchanged
from the acked text.

 .../bindings/net/nfc/samsung,s3fwrn5.yaml     | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/net/nfc/samsung,s3fwrn5.yaml b/Documentation/devicetree/bindings/net/nfc/samsung,s3fwrn5.yaml
index 12baee45752c..40a69466802b 100644
--- a/Documentation/devicetree/bindings/net/nfc/samsung,s3fwrn5.yaml
+++ b/Documentation/devicetree/bindings/net/nfc/samsung,s3fwrn5.yaml
@@ -14,6 +14,7 @@ properties:
     enum:
       - samsung,s3fwrn5-i2c
       - samsung,s3fwrn82
+      - samsung,s3nrn4v
 
   en-gpios:
     maxItems: 1
@@ -29,6 +30,9 @@ properties:
   clocks:
     maxItems: 1
 
+  pvdd-supply:
+    description: PVDD power supply
+
   wake-gpios:
     maxItems: 1
     description:
@@ -58,12 +62,25 @@ allOf:
       properties:
         compatible:
           contains:
-            const: samsung,s3fwrn5-i2c
+            enum:
+              - samsung,s3fwrn5-i2c
+              - samsung,s3nrn4v
     then:
       required:
         - interrupts
         - reg
 
+  # Deployed DTs for the older parts never described a supply, so PVDD is
+  # only required for the new device.
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: samsung,s3nrn4v
+    then:
+      required:
+        - pvdd-supply
+
 examples:
   - |
     #include <dt-bindings/gpio/gpio.h>
-- 
2.55.0