[PATCH 1/2] dt-bindings: phy: phy-stm32-usbphyc: add #clock-cells required property

[Amelie Delaunay <amelie.delaunay@foss.st.com>]

usbphyc provides a unique clock called ck_usbo_48m.
STM32 USB OTG needs a 48Mhz clock (utmifs_clk48) for Full-Speed operation.
ck_usbo_48m is a possible parent clock for USB OTG 48Mhz clock.

ck_usbo_48m is available as soon as the PLL is enabled.

Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
---
 .../devicetree/bindings/phy/phy-stm32-usbphyc.yaml          | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml b/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml
index 46df6786727a..4e4da64b8e01 100644
--- a/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml
+++ b/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml
@@ -51,6 +51,10 @@ properties:
   vdda1v8-supply:
     description: regulator providing 1V8 power supply to the PLL block
 
+  '#clock-cells':
+    description: number of clock cells for ck_usbo_48m consumer
+    const: 0
+
 #Required child nodes:
 
 patternProperties:
@@ -102,6 +106,7 @@ required:
   - "#size-cells"
   - vdda1v1-supply
   - vdda1v8-supply
+  - '#clock-cells'
   - usb-phy@0
   - usb-phy@1
 
@@ -120,6 +125,7 @@ examples:
         vdda1v8-supply = <&reg18>;
         #address-cells = <1>;
         #size-cells = <0>;
+        #clock-cells = <0>;
 
         usbphyc_port0: usb-phy@0 {
             reg = <0>;
-- 
2.17.1