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The Xilinx device trees typically >> + use 2 but the 2nd value is not used. >> + >> + interrupt-controller: true >> + >> + interrupts: >> + maxItems: 1 >> + description: >> + Specifies the interrupt of the parent controller from which it is chained. >> + >> + xlnx,kind-of-intr: >> + $ref: /schemas/types.yaml#/definitions/uint32 >> + description: >> + A 32 bit value specifying the interrupt type for each possible interrupt >> + (1 = edge, 0 = level). The interrupt type typically comes in thru >> + the device tree node of the interrupt generating device, but in this case >> + the interrupt type is determined by the interrupt controller based on how >> + it was implemented. > > enum: [ 0, 1 ] It is hex value for all interrupts together. And bit position correspond to interrupt line. And you can mix edge or level interrupts together and this is the property which distinguish them. I know that separate cell is normally used but it has never been converted to be like that but interrupt-cells is 2 that binding allows using this description too. Thanks, Michal