xref: /kernel/linux/linux-6.6/Documentation/devicetree/bindings/mailbox/st,stm32-ipcc.yaml (revision 62306a36)

# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/mailbox/st,stm32-ipcc.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: STMicroelectronics STM32 IPC controller

description:
  The IPCC block provides a non blocking signaling mechanism to post and
  retrieve messages in an atomic way between two processors.
  It provides the signaling for N bidirectionnal channels. The number of
  channels (N) can be read from a dedicated register.

maintainers:
  - Fabien Dessenne <fabien.dessenne@foss.st.com>
  - Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>

properties:
  compatible:
    const: st,stm32mp1-ipcc

  reg:
    maxItems: 1

  clocks:
    maxItems: 1

  interrupts:
    items:
      - description: rx channel occupied
      - description: tx channel free

  interrupt-names:
    items:
      - const: rx
      - const: tx

  wakeup-source: true

  "#mbox-cells":
    const: 1

  st,proc-id:
    description: Processor id using the mailbox (0 or 1)
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [0, 1]

required:
  - compatible
  - reg
  - st,proc-id
  - clocks
  - interrupt-names
  - "#mbox-cells"
  - interrupts

additionalProperties: false

examples:
  - |
    #include <dt-bindings/interrupt-controller/arm-gic.h>
    #include <dt-bindings/clock/stm32mp1-clks.h>
    ipcc: mailbox@4c001000 {
      compatible = "st,stm32mp1-ipcc";
      #mbox-cells = <1>;
      reg = <0x4c001000 0x400>;
      st,proc-id = <0>;
      interrupts-extended = <&exti 61 1>,
                            <&intc GIC_SPI 101 IRQ_TYPE_LEVEL_HIGH>;
      interrupt-names = "rx", "tx";
      clocks = <&rcc_clk IPCC>;
      wakeup-source;
    };

...