PN547/553, QN310/330 chips on some devices require a pad supply voltage
(PVDD). Otherwise, the NFC won't power up.

Document support for pad supply voltage pvdd-supply that is enabled by
the nxp-nci driver so that the regulator gets enabled when needed.

Signed-off-by: Raymond Hackley <raymondhackley@protonmail.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
---
 Documentation/devicetree/bindings/net/nfc/nxp,nci.yaml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/nfc/nxp,nci.yaml b/Documentation/devicetree/bindings/net/nfc/nxp,nci.yaml
index 6924aff0b2c5..d5a4f935c2ce 100644
--- a/Documentation/devicetree/bindings/net/nfc/nxp,nci.yaml
+++ b/Documentation/devicetree/bindings/net/nfc/nxp,nci.yaml
@@ -25,6 +25,11 @@ properties:
   firmware-gpios:
     description: Output GPIO pin used to enter firmware download mode
 
+  pvdd-supply:
+    description: |
+      Optional regulator that provides pad supply voltage for some
+      controllers
+
   interrupts:
     maxItems: 1
 
-- 
2.30.2