xref: /kernel/linux/linux-5.10/Documentation/devicetree/bindings/remoteproc/ti,k3-r5f-rproc.yaml

# SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/remoteproc/ti,k3-r5f-rproc.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: TI K3 R5F processor subsystems

maintainers:
  - Suman Anna <s-anna@ti.com>

description: |
  The TI K3 family of SoCs usually have one or more dual-core Arm Cortex R5F
  processor subsystems/clusters (R5FSS). The dual core cluster can be used
  either in a LockStep mode providing safety/fault tolerance features or in a
  Split mode providing two individual compute cores for doubling the compute
  capacity. These are used together with other processors present on the SoC
  to achieve various system level goals.

  Each Dual-Core R5F sub-system is represented as a single DTS node
  representing the cluster, with a pair of child DT nodes representing
  the individual R5F cores. Each node has a number of required or optional
  properties that enable the OS running on the host processor to perform
  the device management of the remote processor and to communicate with the
  remote processor.

properties:
  $nodename:
    pattern: "^r5fss(@.*)?"

  compatible:
    enum:
      - ti,am654-r5fss
      - ti,j721e-r5fss

  power-domains:
    description: |
      Should contain a phandle to a PM domain provider node and an args
      specifier containing the R5FSS device id value.
    maxItems: 1

  "#address-cells":
    const: 1

  "#size-cells":
    const: 1

  ranges:
    description: |
      Standard ranges definition providing address translations for
      local R5F TCM address spaces to bus addresses.

# Optional properties:
# --------------------

  ti,cluster-mode:
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [0, 1]
    description: |
      Configuration Mode for the Dual R5F cores within the R5F cluster.
      Should be either a value of 1 (LockStep mode) or 0 (Split mode),
      default is LockStep mode if omitted.

# R5F Processor Child Nodes:
# ==========================

patternProperties:
  "^r5f@[a-f0-9]+$":
    type: object
    description: |
      The R5F Sub-System device node should define two R5F child nodes, each
      node representing a TI instantiation of the Arm Cortex R5F core. There
      are some specific integration differences for the IP like the usage of
      a Region Address Translator (RAT) for translating the larger SoC bus
      addresses into a 32-bit address space for the processor.

      Each R5F core has an associated 64 KB of Tightly-Coupled Memory (TCM)
      internal memories split between two banks - TCMA and TCMB (further
      interleaved into two banks TCMB0 and TCMB1). These memories (also called
      ATCM and BTCM) provide read/write performance on par with the core's L1
      caches. Each of the TCMs can be enabled or disabled independently and
      either of them can be configured to appear at that R5F's address 0x0.

      The cores do not use an MMU, but has a Region Address Translater
      (RAT) module that is accessible only from the R5Fs for providing
      translations between 32-bit CPU addresses into larger system bus
      addresses. Cache and memory access settings are provided through a
      Memory Protection Unit (MPU), programmable only from the R5Fs.

    allOf:
      - $ref: /schemas/arm/keystone/ti,k3-sci-common.yaml#

    properties:
      compatible:
        enum:
          - ti,am654-r5f
          - ti,j721e-r5f

      reg:
        items:
          - description: Address and Size of the ATCM internal memory region
          - description: Address and Size of the BTCM internal memory region

      reg-names:
        items:
          - const: atcm
          - const: btcm

      resets:
        description: |
          Should contain the phandle to the reset controller node managing the
          local resets for this device, and a reset specifier.
        maxItems: 1

      firmware-name:
        description: |
          Should contain the name of the default firmware image
          file located on the firmware search path

# The following properties are mandatory for R5F Core0 in both LockStep and Split
# modes, and are mandatory for R5F Core1 _only_ in Split mode. They are unused for
# R5F Core1 in LockStep mode:

      mboxes:
        description: |
          OMAP Mailbox specifier denoting the sub-mailbox, to be used for
          communication with the remote processor. This property should match
          with the sub-mailbox node used in the firmware image.
        maxItems: 1

      memory-region:
        description: |
          phandle to the reserved memory nodes to be associated with the
          remoteproc device. There should be at least two reserved memory nodes
          defined. The reserved memory nodes should be carveout nodes, and
          should be defined with a "no-map" property as per the bindings in
          Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt
        minItems: 2
        maxItems: 8
        items:
          - description: region used for dynamic DMA allocations like vrings and
                         vring buffers
          - description: region reserved for firmware image sections
        additionalItems: true


# Optional properties:
# --------------------
# The following properties are optional properties for each of the R5F cores:

      ti,atcm-enable:
        $ref: /schemas/types.yaml#/definitions/uint32
        enum: [0, 1]
        description: |
          R5F core configuration mode dictating if ATCM should be enabled. The
          R5F address of ATCM is dictated by ti,loczrama property. Should be
          either a value of 1 (enabled) or 0 (disabled), default is disabled
          if omitted. Recommended to enable it for maximizing TCMs.

      ti,btcm-enable:
        $ref: /schemas/types.yaml#/definitions/uint32
        enum: [0, 1]
        description: |
          R5F core configuration mode dictating if BTCM should be enabled. The
          R5F address of BTCM is dictated by ti,loczrama property. Should be
          either a value of 1 (enabled) or 0 (disabled), default is enabled if
          omitted.

      ti,loczrama:
        $ref: /schemas/types.yaml#/definitions/uint32
        enum: [0, 1]
        description: |
          R5F core configuration mode dictating which TCM should appear at
          address 0 (from core's view). Should be either a value of 1 (ATCM
          at 0x0) or 0 (BTCM at 0x0), default value is 1 if omitted.

      sram:
        $ref: /schemas/types.yaml#/definitions/phandle-array
        minItems: 1
        maxItems: 4
        description: |
          phandles to one or more reserved on-chip SRAM regions. The regions
          should be defined as child nodes of the respective SRAM node, and
          should be defined as per the generic bindings in,
          Documentation/devicetree/bindings/sram/sram.yaml

    required:
      - compatible
      - reg
      - reg-names
      - ti,sci
      - ti,sci-dev-id
      - ti,sci-proc-ids
      - resets
      - firmware-name

    unevaluatedProperties: false

required:
  - compatible
  - power-domains
  - "#address-cells"
  - "#size-cells"
  - ranges

additionalProperties: false

examples:
  - |
    / {
        model = "Texas Instruments K3 AM654 SoC";
        compatible = "ti,am654-evm", "ti,am654";
        #address-cells = <2>;
        #size-cells = <2>;

        bus@100000 {
            compatible = "simple-bus";
            #address-cells = <2>;
            #size-cells = <2>;
            ranges = <0x00 0x00100000 0x00 0x00100000 0x00 0x00020000>, /* ctrl mmr */
                     <0x00 0x41000000 0x00 0x41000000 0x00 0x00020000>,
                     <0x00 0x41400000 0x00 0x41400000 0x00 0x00020000>,
                     <0x00 0x41c00000 0x00 0x41c00000 0x00 0x00080000>;

            bus@28380000 {
                compatible = "simple-bus";
                #address-cells = <2>;
                #size-cells = <2>;
                ranges = <0x00 0x28380000 0x00 0x28380000 0x00 0x03880000>, /* MCU NAVSS */
                         <0x00 0x41000000 0x00 0x41000000 0x00 0x00020000>, /* MCU R5F Core0 */
                         <0x00 0x41400000 0x00 0x41400000 0x00 0x00020000>, /* MCU R5F Core1 */
                         <0x00 0x41c00000 0x00 0x41c00000 0x00 0x00080000>; /* MCU SRAM */

                /* AM65x MCU R5FSS node */
                mcu_r5fss0: r5fss@41000000 {
                    compatible = "ti,am654-r5fss";
                    power-domains = <&k3_pds 129>;
                    ti,cluster-mode = <1>;
                    #address-cells = <1>;
                    #size-cells = <1>;
                    ranges = <0x41000000 0x00 0x41000000 0x20000>,
                             <0x41400000 0x00 0x41400000 0x20000>;

                    mcu_r5f0: r5f@41000000 {
                        compatible = "ti,am654-r5f";
                        reg = <0x41000000 0x00008000>,
                              <0x41010000 0x00008000>;
                        reg-names = "atcm", "btcm";
                        ti,sci = <&dmsc>;
                        ti,sci-dev-id = <159>;
                        ti,sci-proc-ids = <0x01 0xFF>;
                        resets = <&k3_reset 159 1>;
                        firmware-name = "am65x-mcu-r5f0_0-fw";
                        ti,atcm-enable = <1>;
                        ti,btcm-enable = <1>;
                        ti,loczrama = <1>;
                        mboxes = <&mailbox0 &mbox_mcu_r5fss0_core0>;
                        memory-region = <&mcu_r5fss0_core0_dma_memory_region>,
                                        <&mcu_r5fss0_core0_memory_region>;
                        sram = <&mcu_r5fss0_core0_sram>;
                    };

                    mcu_r5f1: r5f@41400000 {
                        compatible = "ti,am654-r5f";
                        reg = <0x41400000 0x00008000>,
                              <0x41410000 0x00008000>;
                        reg-names = "atcm", "btcm";
                        ti,sci = <&dmsc>;
                        ti,sci-dev-id = <245>;
                        ti,sci-proc-ids = <0x02 0xFF>;
                        resets = <&k3_reset 245 1>;
                        firmware-name = "am65x-mcu-r5f0_1-fw";
                        ti,atcm-enable = <1>;
                        ti,btcm-enable = <1>;
                        ti,loczrama = <1>;
                        mboxes = <&mailbox1 &mbox_mcu_r5fss0_core1>;
                    };
                };
            };
        };
    };