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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.
+ items:
+ - const: microchip,sbi-ipc
+
+ - description:
+ SoC-specific compatible, intended for use by the SBI
+ implementation in machine mode (m-mode).
+ items:
+ - const: microchip,miv-ihc-rtl-v2
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ minItems: 1
+ maxItems: 5
+
+ interrupt-names:
+ minItems: 1
+ maxItems: 5
+ items:
+ pattern: "^hart-[0-5]+$"
+
+ "#mbox-cells":
+ description: >
+ For the SBI "device", the cell represents the global "logical" channel IDs.
+ The meaning of channel IDs are platform firmware dependent.
+
+ For the SoC-specific compatible string, 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.
+
+ The mask is a 16-bit value, but only the first 15 bits are utilized.
+ Each of the bits corresponds to one of the 15 IHC channels.
+
+ 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 remaining bit of the 16-bit mask is reserved and should be ignored.
+
+ The actual enable/disable state of each channel is determined by the
+ IP block’s configuration.
+ $ref: /schemas/types.yaml#/definitions/uint16
+ default: 0
+
+required:
+ - compatible
+ - interrupts
+ - interrupt-names
+ - "#mbox-cells"
+
+additionalProperties: false
+
+allOf:
+ - if:
+ properties:
+ compatible:
+ contains:
+ const: microchip,sbi-ipc
+ then:
+ properties:
+ reg: false
+ microchip,ihc-chan-disabled-mask: false
+ else:
+ required:
+ - reg
+ - microchip,ihc-chan-disabled-mask
+
+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 | 117 ++++++++++++++++++ 1 file changed, 117 insertions(+) create mode 100644 Documentation/devicetree/bindings/mailbox/microchip,sbi-ipc.yaml