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+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mailbox/microchip,sbi-ipc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip Inter-processor communication (IPC) mailbox controller
+
+maintainers:
+ - Valentina Fernandez <valentina.fernandezalanis@microchip.com>
+
+description:
+ The Microchip Inter-processor Communication (IPC) facilitates
+ message passing between processors using an interrupt signaling
+ mechanism.
+
+properties:
+ compatible:
+ oneOf:
+ - description:
+ Intended for use by software running in supervisor privileged
+ mode (s-mode). This SBI interface is compatible with the Mi-V
+ Inter-hart Communication (IHC) IP.
+ const: microchip,sbi-ipc
+
+ - description:
+ Intended for use by the SBI implementation in machine mode
+ (m-mode), this compatible string is for the MIV_IHC Soft-IP.
+ const: microchip,miv-ihc-rtl-v2
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ minItems: 1
+ maxItems: 5
+
+ interrupt-names:
+ minItems: 1
+ maxItems: 5
+ items:
+ enum:
+ - hart-0
+ - hart-1
+ - hart-2
+ - hart-3
+ - hart-4
+ - hart-5
+
+ "#mbox-cells":
+ description: >
+ For "microchip,sbi-ipc", the cell represents the global "logical"
+ channel IDs. The meaning of channel IDs are platform firmware dependent.
+
+ For "microchip,miv-ihc-rtl-v2", the cell represents the physical
+ channel and does not vary based on the platform firmware.
+ const: 1
+
+ microchip,ihc-chan-disabled-mask:
+ description: >
+ Represents the enable/disable state of the bi-directional IHC
+ channels within the MIV-IHC IP configuration.
+
+ A bit set to '1' indicates that the corresponding channel is disabled,
+ and any read or write operations to that channel will return zero.
+
+ A bit set to '0' indicates that the corresponding channel is enabled
+ and will be accessible through its dedicated address range registers.
+
+ The actual enable/disable state of each channel is determined by the
+ IP block’s configuration.
+ $ref: /schemas/types.yaml#/definitions/uint16
+ maximum: 0x7fff
+ default: 0
+
+required:
+ - compatible
+ - interrupts
+ - interrupt-names
+ - "#mbox-cells"
+
+allOf:
+ - if:
+ properties:
+ compatible:
+ contains:
+ const: microchip,sbi-ipc
+ then:
+ properties:
+ reg:
+ not: {}
+ description:
+ The 'microchip,sbi-ipc' operates in a programming model
+ that does not require memory-mapped I/O (MMIO) registers
+ since it uses SBI ecalls provided by the m-mode/firmware
+ SBI implementation to access hardware registers.
+ microchip,ihc-chan-disabled-mask: false
+ else:
+ required:
+ - reg
+ - microchip,ihc-chan-disabled-mask
+
+additionalProperties: false
+
+examples:
+ - |
+ mailbox {
+ compatible = "microchip,sbi-ipc";
+ interrupt-parent = <&plic>;
+ interrupts = <180>, <179>, <178>;
+ interrupt-names = "hart-1", "hart-2", "hart-3";
+ #mbox-cells = <1>;
+ };
+ - |
+ mailbox@50000000 {
+ compatible = "microchip,miv-ihc-rtl-v2";
+ microchip,ihc-chan-disabled-mask = /bits/ 16 <0>;
+ reg = <0x50000000 0x1c000>;
+ interrupt-parent = <&plic>;
+ interrupts = <180>, <179>, <178>;
+ interrupt-names = "hart-1", "hart-2", "hart-3";
+ #mbox-cells = <1>;
+ };
Add a dt-binding for the Microchip Inter-Processor Communication (IPC) mailbox controller. Signed-off-by: Valentina Fernandez <valentina.fernandezalanis@microchip.com> --- .../bindings/mailbox/microchip,sbi-ipc.yaml | 123 ++++++++++++++++++ 1 file changed, 123 insertions(+) create mode 100644 Documentation/devicetree/bindings/mailbox/microchip,sbi-ipc.yaml