dts/bindings/spi/xlnx,xps-spi-2.00.a.yaml

# Copyright (c) 2020 Henrik Brix Andersen <henrik@brixandersen.dk>
# SPDX-License-Identifier: Apache-2.0

description: Xilinx AXI Quad SPI IP node

compatible: "xlnx,xps-spi-2.00.a"

include: spi-controller.yaml

# Property names correspond to a subset of those generated by
# https://github.com/Xilinx/device-tree-xlnx

properties:
  reg:
    required: true

  interrupts:
    required: true

  xlnx,num-ss-bits:
    type: int
    required: true
    enum:
      - 1
      - 2
      - 3
      - 4
    description: |
      Number of slave select bits implemented

  xlnx,num-transfer-bits:
    type: int
    required: true
    enum:
      - 8
      - 16
      - 32
    description: |
      Number of bits per transfer

  xlnx,startup-block:
    type: boolean
    description: |
      Indicates the core is instantiated with the STARTUP block option, as is
      typically used when interfacing with the FPGA's configuration flash
      device. In this configuration the SPI clock is routed through the
      STARTUP block rather than normal signal routing.
      In this case, a workaround is required to issue a dummy
      transaction to the SPI flash device to ensure the STARTUP block is
      disengaged and allow the SPI core to control the CCLK line properly.
      The dummy READ_ID transaction will be issued to chip select 0.

  fifo-size:
    type: int
    description: |
      FIFO size configured in SPI core. 0 indicates no FIFO.
      If not specified, 0 is assumed.
      Used to optimize TX/RX read handling. If the FIFO size is 0, the driver
      will check for FIFO full/empty after every word.