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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mailbox/xlnx,zynqmp-ipi-mailbox.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Xilinx IPI(Inter Processor Interrupt) mailbox controller
+
+description: |
+ The Xilinx IPI(Inter Processor Interrupt) mailbox controller is to manage
+ messaging between two Xilinx Zynq UltraScale+ MPSoC IPI agents. Each IPI
+ agent owns registers used for notification and buffers for message.
+
+ +-------------------------------------+
+ | Xilinx ZynqMP IPI Controller |
+ +-------------------------------------+
+ +--------------------------------------------------+
+ TF-A | |
+ | |
+ | |
+ +--------------------------+ |
+ | |
+ | |
+ +--------------------------------------------------+
+ +------------------------------------------+
+ | +----------------+ +----------------+ |
+ Hardware | | IPI Agent | | IPI Buffers | |
+ | | Registers | | | |
+ | | | | | |
+ | +----------------+ +----------------+ |
+ | |
+ | Xilinx IPI Agent Block |
+ +------------------------------------------+
+
+maintainers:
+ - Shubhrajyoti Datta <shubhrajyoti.datta@amd.com>
+
+properties:
+ compatible:
+ const: xlnx,zynqmp-ipi-mailbox
+
+ method:
+ description: |
+ The method of calling the PM-API firmware layer.
+ Permitted values are.
+ - "smc" : SMC #0, following the SMCCC
+ - "hvc" : HVC #0, following the SMCCC
+
+ $ref: /schemas/types.yaml#/definitions/string
+ enum:
+ - smc
+ - hvc
+ default: smc
+
+ '#address-cells':
+ const: 2
+
+ '#size-cells':
+ const: 2
+
+ xlnx,ipi-id:
+ description: |
+ Remote Xilinx IPI agent ID of which the mailbox is connected to.
+ $ref: /schemas/types.yaml#/definitions/uint32
+
+ interrupts:
+ maxItems: 1
+
+ ranges: true
+
+patternProperties:
+ '^mailbox@[0-9a-f]+$':
+ description: Internal ipi mailbox node
+ type: object # DT nodes are json objects
+ additionalProperties: false
+ properties:
+
+ compatible:
+ const: xlnx,zynqmp-ipi-dest-mailbox
+
+ xlnx,ipi-id:
+ description:
+ Remote Xilinx IPI agent ID of which the mailbox is connected to.
+ $ref: /schemas/types.yaml#/definitions/uint32
+
+ '#mbox-cells':
+ const: 1
+ description:
+ It contains tx(0) or rx(1) channel IPI id number.
+
+ reg:
+ maxItems: 4
+
+ reg-names:
+ items:
+ - const: local_request_region
+ - const: local_response_region
+ - const: remote_request_region
+ - const: remote_response_region
+
+ required:
+ - compatible
+ - reg
+ - reg-names
+ - "#mbox-cells"
+
+additionalProperties: false
+
+required:
+ - compatible
+ - interrupts
+ - '#address-cells'
+ - '#size-cells'
+ - xlnx,ipi-id
+
+examples:
+ - |
+ #include<dt-bindings/interrupt-controller/arm-gic.h>
+
+ amba {
+ #address-cells = <0x2>;
+ #size-cells = <0x2>;
+ zynqmp-mailbox {
+ compatible = "xlnx,zynqmp-ipi-mailbox";
+ interrupts = <GIC_SPI 29 IRQ_TYPE_LEVEL_HIGH>;
+ xlnx,ipi-id = <0>;
+ #address-cells = <2>;
+ #size-cells = <2>;
+ ranges;
+
+ mailbox: mailbox@ff9905c0 {
+ compatible = "xlnx,zynqmp-ipi-dest-mailbox";
+ reg = <0x0 0xff9905c0 0x0 0x20>,
+ <0x0 0xff9905e0 0x0 0x20>,
+ <0x0 0xff990e80 0x0 0x20>,
+ <0x0 0xff990ea0 0x0 0x20>;
+ reg-names = "local_request_region",
+ "local_response_region",
+ "remote_request_region",
+ "remote_response_region";
+ #mbox-cells = <1>;
+ xlnx,ipi-id = <4>;
+ };
+ };
+ };
+
+...