[PATCH v4 1/2] dt-bindings: phy: imx8mq-usb: add alternate reference clock

[Xu Yang <xu.yang_2@nxp.com>]

Beside default 24MHz clock input, there is an optional additional 100Mhz
clock input 'alt' for USB PHY reference clock.

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>

---
Changes in v2:
 - improve commit message
Changes in v3:
 - no changes
Changes in v4:
 - no changes
---
 .../devicetree/bindings/phy/fsl,imx8mq-usb-phy.yaml        | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/phy/fsl,imx8mq-usb-phy.yaml b/Documentation/devicetree/bindings/phy/fsl,imx8mq-usb-phy.yaml
index f9cffbb2df07..8a00a6c58edd 100644
--- a/Documentation/devicetree/bindings/phy/fsl,imx8mq-usb-phy.yaml
+++ b/Documentation/devicetree/bindings/phy/fsl,imx8mq-usb-phy.yaml
@@ -27,11 +27,16 @@ properties:
     const: 0
 
   clocks:
-    maxItems: 1
+    minItems: 1
+    items:
+      - description: PHY configuration clock
+      - description: Alternate PHY reference clock
 
   clock-names:
+    minItems: 1
     items:
       - const: phy
+      - const: alt
 
   power-domains:
     maxItems: 1
-- 
2.34.1