On 26/09/2024 12:32, Frank Wang wrote: > + - if: > + properties: > + compatible: > + contains: > + enum: > + - rockchip,rk3576-usb2phy > + then: > + properties: > + clocks: > + minItems: 3 > + maxItems: 3 Read one more time the example I gave you. Top-level constraints are saying max one clock. Best regards, Krzysztof