xref: /linux/Documentation/devicetree/bindings/memory-controllers/st,stm32-fmc2-ebi-props.yaml (revision 7ae9fb1b7ecbb5d85d07857943f677fd1a559b18)

# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/memory-controllers/st,stm32-fmc2-ebi-props.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Peripheral properties for ST FMC2 Controller

maintainers:
  - Christophe Kerello <christophe.kerello@foss.st.com>
  - Marek Vasut <marex@denx.de>

properties:
  st,fmc2-ebi-cs-transaction-type:
    description: |
      Select one of the transactions type supported
      0: Asynchronous mode 1 SRAM/FRAM.
      1: Asynchronous mode 1 PSRAM.
      2: Asynchronous mode A SRAM/FRAM.
      3: Asynchronous mode A PSRAM.
      4: Asynchronous mode 2 NOR.
      5: Asynchronous mode B NOR.
      6: Asynchronous mode C NOR.
      7: Asynchronous mode D NOR.
      8: Synchronous read synchronous write PSRAM.
      9: Synchronous read asynchronous write PSRAM.
      10: Synchronous read synchronous write NOR.
      11: Synchronous read asynchronous write NOR.
    $ref: /schemas/types.yaml#/definitions/uint32
    minimum: 0
    maximum: 11

  st,fmc2-ebi-cs-cclk-enable:
    description: Continuous clock enable (first bank must be configured
      in synchronous mode). The FMC_CLK is generated continuously
      during asynchronous and synchronous access. By default, the
      FMC_CLK is only generated during synchronous access.
    $ref: /schemas/types.yaml#/definitions/flag

  st,fmc2-ebi-cs-mux-enable:
    description: Address/Data multiplexed on databus (valid only with
      NOR and PSRAM transactions type). By default, Address/Data
      are not multiplexed.
    $ref: /schemas/types.yaml#/definitions/flag

  st,fmc2-ebi-cs-buswidth:
    description: Data bus width
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [ 8, 16 ]
    default: 16

  st,fmc2-ebi-cs-waitpol-high:
    description: Wait signal polarity (NWAIT signal active high).
      By default, NWAIT is active low.
    $ref: /schemas/types.yaml#/definitions/flag

  st,fmc2-ebi-cs-waitcfg-enable:
    description: The NWAIT signal indicates wheither the data from the
      device are valid or if a wait state must be inserted when accessing
      the device in synchronous mode. By default, the NWAIT signal is
      active one data cycle before wait state.
    $ref: /schemas/types.yaml#/definitions/flag

  st,fmc2-ebi-cs-wait-enable:
    description: The NWAIT signal is enabled (its level is taken into
      account after the programmed latency period to insert wait states
      if asserted). By default, the NWAIT signal is disabled.
    $ref: /schemas/types.yaml#/definitions/flag

  st,fmc2-ebi-cs-asyncwait-enable:
    description: The NWAIT signal is taken into account during asynchronous
      transactions. By default, the NWAIT signal is not taken into account
      during asynchronous transactions.
    $ref: /schemas/types.yaml#/definitions/flag

  st,fmc2-ebi-cs-cpsize:
    description: CRAM page size. The controller splits the burst access
      when the memory page is reached. By default, no burst split when
      crossing page boundary.
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [ 0, 128, 256, 512, 1024 ]
    default: 0

  st,fmc2-ebi-cs-byte-lane-setup-ns:
    description: This property configures the byte lane setup timing
      defined in nanoseconds from NBLx low to Chip Select NEx low.

  st,fmc2-ebi-cs-address-setup-ns:
    description: This property defines the duration of the address setup
      phase in nanoseconds used for asynchronous read/write transactions.

  st,fmc2-ebi-cs-address-hold-ns:
    description: This property defines the duration of the address hold
      phase in nanoseconds used for asynchronous multiplexed read/write
      transactions.

  st,fmc2-ebi-cs-data-setup-ns:
    description: This property defines the duration of the data setup phase
      in nanoseconds used for asynchronous read/write transactions.

  st,fmc2-ebi-cs-bus-turnaround-ns:
    description: This property defines the delay in nanoseconds between the
      end of current read/write transaction and the next transaction.

  st,fmc2-ebi-cs-data-hold-ns:
    description: This property defines the duration of the data hold phase
      in nanoseconds used for asynchronous read/write transactions.

  st,fmc2-ebi-cs-clk-period-ns:
    description: This property defines the FMC_CLK output signal period in
      nanoseconds.

  st,fmc2-ebi-cs-data-latency-ns:
    description: This property defines the data latency before reading or
      writing the first data in nanoseconds.

  st,fmc2-ebi-cs-write-address-setup-ns:
    description: This property defines the duration of the address setup
      phase in nanoseconds used for asynchronous write transactions.

  st,fmc2-ebi-cs-write-address-hold-ns:
    description: This property defines the duration of the address hold
      phase in nanoseconds used for asynchronous multiplexed write
      transactions.

  st,fmc2-ebi-cs-write-data-setup-ns:
    description: This property defines the duration of the data setup
      phase in nanoseconds used for asynchronous write transactions.

  st,fmc2-ebi-cs-write-bus-turnaround-ns:
    description: This property defines the delay between the end of current
      write transaction and the next transaction in nanoseconds.

  st,fmc2-ebi-cs-write-data-hold-ns:
    description: This property defines the duration of the data hold phase
      in nanoseconds used for asynchronous write transactions.

  st,fmc2-ebi-cs-max-low-pulse-ns:
    description: This property defines the maximum chip select low pulse
      duration in nanoseconds for synchronous transactions. When this timing
      reaches 0, the controller splits the current access, toggles NE to
      allow device refresh and restarts a new access.

additionalProperties: true