FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/arm/stm32/st,mlahb.yaml

     # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
     %YAML 1.2
     ---
     $id: "http://devicetree.org/schemas/arm/stm32/st,mlahb.yaml#"
     $schema: "http://devicetree.org/meta-schemas/core.yaml#"
     
     title: STMicroelectronics STM32 ML-AHB interconnect bindings
     
     maintainers:
      - Fabien Dessenne <fabien.dessenne@foss.st.com>
      - Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
    
    description: |
      These bindings describe the STM32 SoCs ML-AHB interconnect bus which connects
      a Cortex-M subsystem with dedicated memories. The MCU SRAM and RETRAM memory
      parts can be accessed through different addresses (see "RAM aliases" in [1])
      using different buses (see [2]): balancing the Cortex-M firmware accesses
      among those ports allows to tune the system performance.
      [1]: https://www.st.com/resource/en/reference_manual/dm00327659.pdf
      [2]: https://wiki.st.com/stm32mpu/wiki/STM32MP15_RAM_mapping
    
    allOf:
      - $ref: /schemas/simple-bus.yaml#
    
    properties:
      compatible:
        contains:
          enum:
            - st,mlahb
    
      dma-ranges:
        description: |
          Describe memory addresses translation between the local CPU and the
          remote Cortex-M processor. Each memory region, is declared with
          3 parameters:
          - param 1: device base address (Cortex-M processor address)
          - param 2: physical base address (local CPU address)
          - param 3: size of the memory region.
        maxItems: 3
    
      '#address-cells':
        const: 1
    
      '#size-cells':
        const: 1
    
    required:
      - compatible
      - '#address-cells'
      - '#size-cells'
      - dma-ranges
    
    unevaluatedProperties: false
    
    examples:
      - |
        mlahb: ahb@38000000 {
          compatible = "st,mlahb", "simple-bus";
          #address-cells = <1>;
          #size-cells = <1>;
          reg = <0x10000000 0x40000>;
          ranges;
          dma-ranges = <0x00000000 0x38000000 0x10000>,
                       <0x10000000 0x10000000 0x60000>,
                       <0x30000000 0x30000000 0x60000>;
    
          m4_rproc: m4@10000000 {
           reg = <0x10000000 0x40000>;
          };
        };
    
    ...

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