[PATCH v2 3/6] dt-bindings: usb: dwc3: add reference clock period

[Baruch Siach]

Document the snps,ref-clock-period property that describes reference
clock period when it deviates from the default set value.

Signed-off-by: Baruch Siach <baruch at tkos.co.il>
---
 Documentation/devicetree/bindings/usb/snps,dwc3.yaml | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
index 41416fbd92aa..c8027d2852cd 100644
--- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
+++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
@@ -252,6 +252,15 @@ properties:
     minimum: 0
     maximum: 0x3f
 
+  snps,ref-clock-period:
+    description:
+      Value for REFCLKPER field of GUCTL register for post-silicon reference
+      clock period in nanoseconds, when the hardware set default does not match
+      the actual clock.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 1
+    maximum: 0x3ff
+
   snps,rx-thr-num-pkt-prd:
     description:
       Periodic ESS RX packet threshold count (host mode only). Set this and
-- 
2.30.2