crossbar.txt (2205B)
1Some socs have a large number of interrupts requests to service 2the needs of its many peripherals and subsystems. All of the 3interrupt lines from the subsystems are not needed at the same 4time, so they have to be muxed to the irq-controller appropriately. 5In such places a interrupt controllers are preceded by an CROSSBAR 6that provides flexibility in muxing the device requests to the controller 7inputs. 8 9Required properties: 10- compatible : Should be "ti,irq-crossbar" 11- reg: Base address and the size of the crossbar registers. 12- interrupt-controller: indicates that this block is an interrupt controller. 13- ti,max-irqs: Total number of irqs available at the parent interrupt controller. 14- ti,max-crossbar-sources: Maximum number of crossbar sources that can be routed. 15- ti,reg-size: Size of a individual register in bytes. Every individual 16 register is assumed to be of same size. Valid sizes are 1, 2, 4. 17- ti,irqs-reserved: List of the reserved irq lines that are not muxed using 18 crossbar. These interrupt lines are reserved in the soc, 19 so crossbar bar driver should not consider them as free 20 lines. 21 22Optional properties: 23- ti,irqs-skip: This is similar to "ti,irqs-reserved", but these are for 24 SOC-specific hard-wiring of those irqs which unexpectedly bypasses the 25 crossbar. These irqs have a crossbar register, but still cannot be used. 26 27- ti,irqs-safe-map: integer which maps to a safe configuration to use 28 when the interrupt controller irq is unused (when not provided, default is 0) 29 30Examples: 31 crossbar_mpu: crossbar@4a002a48 { 32 compatible = "ti,irq-crossbar"; 33 reg = <0x4a002a48 0x130>; 34 ti,max-irqs = <160>; 35 ti,max-crossbar-sources = <400>; 36 ti,reg-size = <2>; 37 ti,irqs-reserved = <0 1 2 3 5 6 131 132>; 38 ti,irqs-skip = <10 133 139 140>; 39 }; 40 41Consumer: 42======== 43See Documentation/devicetree/bindings/interrupt-controller/interrupts.txt and 44Documentation/devicetree/bindings/interrupt-controller/arm,gic.yaml for 45further details. 46 47An interrupt consumer on an SoC using crossbar will use: 48 interrupts = <GIC_SPI request_number interrupt_level> 49 50Example: 51 device_x@4a023000 { 52 /* Crossbar 8 used */ 53 interrupts = <GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>; 54 ... 55 };