dts/bindings/mspi/mspi-device.yaml

# Copyright (c) 2024, Ambiq Micro Inc. <www.ambiq.com>
# SPDX-License-Identifier: Apache-2.0

# Common fields for MSPI devices

include: [base.yaml, power.yaml]

on-bus: mspi

properties:
  reg:
    required: true

  mspi-max-frequency:
    type: int
    required: true
    description: |
      Maximum clock frequency of device to configure in Hz.
      In device tree, it is normally the target operating
      frequency after initialization.

  mspi-io-mode:
    type: string
    enum:
      - "MSPI_IO_MODE_SINGLE"
      - "MSPI_IO_MODE_DUAL"
      - "MSPI_IO_MODE_DUAL_1_1_2"
      - "MSPI_IO_MODE_DUAL_1_2_2"
      - "MSPI_IO_MODE_QUAD"
      - "MSPI_IO_MODE_QUAD_1_1_4"
      - "MSPI_IO_MODE_QUAD_1_4_4"
      - "MSPI_IO_MODE_OCTAL"
      - "MSPI_IO_MODE_OCTAL_1_1_8"
      - "MSPI_IO_MODE_OCTAL_1_8_8"
      - "MSPI_IO_MODE_HEX"
      - "MSPI_IO_MODE_HEX_8_8_16"
      - "MSPI_IO_MODE_HEX_8_16_16"
    description: |
      MSPI I/O mode setting.
      In device tree, it is normally the target io mode
      after initialization.

  mspi-data-rate:
    type: string
    enum:
      - "MSPI_DATA_RATE_SINGLE"
      - "MSPI_DATA_RATE_S_S_D"
      - "MSPI_DATA_RATE_S_D_D"
      - "MSPI_DATA_RATE_DUAL"
    description:
      MSPI data rate setting.
      In device tree, it is normally the target data rate
      after initialization.

  mspi-hardware-ce-num:
    type: int
    description: |
      MSPI hardware CE number.
      MSPI controller may natively support multiple peripheral devices
      on the same MSPI instance by assigning designated CE numbers.

  mspi-cpp-mode:
    type: string
    enum:
      - "MSPI_CPP_MODE_0"
      - "MSPI_CPP_MODE_1"
      - "MSPI_CPP_MODE_2"
      - "MSPI_CPP_MODE_3"
    description: |
      MSPI clock polarity setting.
      MSPI_CPP_MODE_0: CPOL=0, CPHA=0
      MSPI_CPP_MODE_1: CPOL=0, CPHA=1
      MSPI_CPP_MODE_2: CPOL=1, CPHA=0
      MSPI_CPP_MODE_3: CPOL=1, CPHA=1

  mspi-endian:
    type: string
    enum:
      - "MSPI_LITTLE_ENDIAN"
      - "MSPI_BIG_ENDIAN"
    description: |
      MSPI transfer MSB or LSB first.

  mspi-ce-polarity:
    type: string
    enum:
      - "MSPI_CE_ACTIVE_LOW"
      - "MSPI_CE_ACTIVE_HIGH"
    description: |
      MSPI CE polarity. In most cases, it is active low.

  mspi-dqs-enable:
    type: boolean
    description: |
      Enable DQS mode for a device which supports it.
      This will be checked against dqs-support and configure
      the MSPI hardware if it supports DQS mode.

  mspi-hold-ce:
    type: boolean
    description: |
      In some cases, it is necessary for the controller to manage
      MSPI chip enable (under software control), so that multiple
      mspi transactions can be performed without releasing CE.
      A typical use case is variable length MSPI packets where
      the first mspi transaction reads the length and the second
      mspi transaction reads length bytes.

  rx-dummy:
    type: int
    description: |
      The number of data or clock cycles between addr and data
      in RX direction.
      0 means the RX dummy phase is disabled.

  tx-dummy:
    type: int
    description: |
      The number of data or clock cycles between addr and data
      in TX direction.
      0 means the TX dummy phase is disabled.

  read-command:
    type: int
    description: |
      Read command to be sent in RX direction.

  write-command:
    type: int
    description: |
      Write command to be sent in RX direction.

  command-length:
    type: string
    enum:
      - "INSTR_DISABLED"
      - "INSTR_1_BYTE"
      - "INSTR_2_BYTE"
    description: |
      Length in bytes of the write and read commands.

  address-length:
    type: string
    enum:
      - "ADDR_DISABLED"
      - "ADDR_1_BYTE"
      - "ADDR_2_BYTE"
      - "ADDR_3_BYTE"
      - "ADDR_4_BYTE"
    description: |
      Length in bytes of address to be sent in address phase.

  xip-config:
    type: array
    description: |
      Array of parameters to configure the xip feature.
      enable: whether XIP feature is enabled.
      address_offset: The offset in bytes to the start of the
                      platform specific XIP address region.
      size: The size in bytes of the XIP address region one
            wish to enable or disable.
      permission: The permission granted to the region. (RW/RO)

      For controller that support this feature. One may map the device
      memory into Soc system memory map. i.e. XIP address region
      So that the device may be used as an external RAM and execute code.

      default =
      <
        .enable         = false;
        .address_offset = 0;
        .size           = 0;
        .permission     = 0;
      >

  scramble-config:
    type: array
    description: |
      Array of parameters to configure the scrambling feature.
      enable: whether scrambling feature is enabled.
      address_offset: The offset in bytes to the start address which
                      can be the offset to the start of the platform
                      specific XIP address region or phyiscal device address.

      size: The size in bytes of the region one wish to enable or disable.
      For controller that support hardware scrambling, one may use it for
      additional security to protect data or code stored in external devices.

      default =
      <
        .enable         = false;
        .address_offset = 0;
        .size           = 0;
      >

  ce-break-config:
    type: array
    description: |
      Array of parameters to configure the auto CE break feature.
      mem_boundary: Memory boundary in bytes of a device that a transfer
                    should't cross.
      time_to_break: The maximum time of a transfer should't exceed for
                     a device in micro seconds(us).

      This is typically used with devices that has memory boundaries or
      requires periodic internal refresh. e.g. psram

      default =
      <
        .mem_boundary    = 0;
        .time_to_break   = 0;
      >