We add DT bindings document for RISC-V advanced platform level interrupt controller (APLIC) defined by the RISC-V advanced interrupt architecture (AIA) specification. Signed-off-by: Anup Patel <apatel@xxxxxxxxxxxxxxxx> --- .../interrupt-controller/riscv,aplic.yaml | 136 ++++++++++++++++++ 1 file changed, 136 insertions(+) create mode 100644 Documentation/devicetree/bindings/interrupt-controller/riscv,aplic.yaml diff --git a/Documentation/devicetree/bindings/interrupt-controller/riscv,aplic.yaml b/Documentation/devicetree/bindings/interrupt-controller/riscv,aplic.yaml new file mode 100644 index 000000000000..0aa48571f3bc --- /dev/null +++ b/Documentation/devicetree/bindings/interrupt-controller/riscv,aplic.yaml @@ -0,0 +1,136 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/interrupt-controller/riscv,aplic.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: RISC-V Advancded Platform Level Interrupt Controller (APLIC) + +maintainers: + - Anup Patel <anup@xxxxxxxxxxxxxx> + +description: + The RISC-V advanced interrupt architecture (AIA) defines advanced platform + level interrupt controller (APLIC) for handling wired interrupts in a + RISC-V platform. The RISC-V AIA specification can be found at + https://github.com/riscv/riscv-aia. + + The RISC-V APLIC is implemented as hierarchical APLIC domains where all + interrupt sources connect to the root domain which can further delegate + interrupts to child domains. We have one device tree node for each APLIC + domain. + +allOf: + - $ref: /schemas/interrupt-controller.yaml# + +properties: + compatible: + items: + - enum: + - vendor,chip-aplic + - const: riscv,aplic + + reg: + maxItems: 1 + + interrupt-controller: true + + "#interrupt-cells": + const: 2 + + interrupts-extended: + minItems: 1 + maxItems: 16384 + description: + The presence of this property implies that given APLIC domain directly + injects external interrupts to a set of RISC-V HARTS (or CPUs). Each + node pointed to should be a riscv,cpu-intc node, which has a riscv node + (i.e. RISC-V HART) as parent. + + msi-parent: + description: + The presence of this property implies that given APLIC domain forwards + wired interrupts as MSIs to a AIA incoming message signaled interrupt + controller (IMSIC). This property should be considered only when the + interrupts-extended property is absent. + + riscv,num-sources: + $ref: "/schemas/types.yaml#/definitions/uint32" + minimum: 1 + maximum: 1023 + description: + Specifies how many wired interrupts are supported by this APLIC domain. + + riscv,children: + $ref: '/schemas/types.yaml#/definitions/phandle-array' + minItems: 1 + maxItems: 1024 + description: + This property represents a list of child APLIC domains for the given + APLIC domain. Each child APLIC domain is assigned child index in + increasing order with the first child APLIC domain assigned child + index 0. The APLIC domain child index is used by firmware to delegate + interrupts from the given APLIC domain to a particular child APLIC + domain. + + riscv,delegate: + $ref: '/schemas/types.yaml#/definitions/phandle-array' + minItems: 1 + maxItems: 1024 + description: + This property represents a interrupt delegation list where each entry + is a triple consisting of child APLIC domain phandle, first interrupt + number, and last interrupt number. The firmware will configure interrupt + delegation registers based on interrupt delegation list. + +additionalProperties: false + +required: + - compatible + - reg + - interrupt-controller + - "#interrupt-cells" + - riscv,num-sources + +examples: + - | + // Example 1 (APIC domain directly injecting interrupt to HARTs): + + aplic0: interrupt-controller@c000000 { + compatible = "vendor,chip-aplic", "riscv,aplic"; + interrupts-extended = <&cpu1_intc 11>, + <&cpu2_intc 11>, + <&cpu3_intc 11>, + <&cpu4_intc 11>; + reg = <0xc000000 0x4080>; + interrupt-controller; + #interrupt-cells = <2>; + riscv,num-sources = <63>; + riscv,children = <&aplic1>; + riscv,delegate = <&aplic1 1 63>; + }; + + aplic1: interrupt-controller@d000000 { + compatible = "vendor,chip-aplic", "riscv,aplic"; + interrupts-extended = <&cpu1_intc 9>, + <&cpu2_intc 9>, + <&cpu3_intc 9>, + <&cpu4_intc 9>; + reg = <0xd000000 0x4080>; + interrupt-controller; + #interrupt-cells = <2>; + riscv,num-sources = <63>; + }; + + - | + // Example 2 (APIC domain forwarding interrupts as MSIs): + + interrupt-controller@d000000 { + compatible = "vendor,chip-aplic", "riscv,aplic"; + msi-parent = <&imsics>; + reg = <0xd000000 0x4000>; + interrupt-controller; + #interrupt-cells = <2>; + riscv,num-sources = <63>; + }; +... -- 2.34.1
