Documentation/devicetree/bindings/mtd/ti,gpmc-nand.yaml

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/mtd/ti,gpmc-nand.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Texas Instruments GPMC NAND Flash controller.

maintainers:
  - Tony Lindgren <tony@atomide.com>
  - Roger Quadros <rogerq@kernel.org>

description:
  GPMC NAND controller/Flash is represented as a child of the
  GPMC controller node.

properties:
  compatible:
    items:
      - enum:
          - ti,am64-nand
          - ti,omap2-nand

  reg:
    maxItems: 1

  interrupts:
    items:
      - description: Interrupt for fifoevent
      - description: Interrupt for termcount

  "#address-cells": true

  "#size-cells": true

  ti,nand-ecc-opt:
    description: Desired ECC algorithm
    $ref: /schemas/types.yaml#/definitions/string
    enum: [sw, ham1, bch4, bch8, bch16]

  ti,nand-xfer-type:
    description: Data transfer method between controller and chip.
    $ref: /schemas/types.yaml#/definitions/string
    enum: [prefetch-polled, polled, prefetch-dma, prefetch-irq]
    default: prefetch-polled

  ti,elm-id:
    description:
      phandle to the ELM (Error Location Module).
    $ref: /schemas/types.yaml#/definitions/phandle

  nand-bus-width:
    description:
      Bus width to the NAND chip
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [8, 16]
    default: 8

  rb-gpios:
    description:
      GPIO connection to R/B signal from NAND chip
    maxItems: 1

patternProperties:
  "@[0-9a-f]+$":
    $ref: /schemas/mtd/partitions/partition.yaml

allOf:
  - $ref: /schemas/memory-controllers/ti,gpmc-child.yaml

required:
  - compatible
  - reg
  - ti,nand-ecc-opt

unevaluatedProperties: false

examples:
  - |
    #include <dt-bindings/interrupt-controller/arm-gic.h>
    #include <dt-bindings/gpio/gpio.h>

    gpmc: memory-controller@50000000 {
      compatible = "ti,am3352-gpmc";
      dmas = <&edma 52 0>;
      dma-names = "rxtx";
      clocks = <&l3s_gclk>;
      clock-names = "fck";
      reg = <0x50000000 0x2000>;
      interrupts = <GIC_SPI 100 IRQ_TYPE_LEVEL_HIGH>;
      gpmc,num-cs = <7>;
      gpmc,num-waitpins = <2>;
      #address-cells = <2>;
      #size-cells = <1>;
      interrupt-controller;
      #interrupt-cells = <2>;
      gpio-controller;
      #gpio-cells = <2>;

      ranges = <0 0 0x08000000 0x01000000>;   /* CS0 space. Min partition = 16MB */
      nand@0,0 {
        compatible = "ti,omap2-nand";
        reg = <0 0 4>;          /* device IO registers */
        interrupt-parent = <&gpmc>;
        interrupts = <0 IRQ_TYPE_NONE>, /* fifoevent */
                     <1 IRQ_TYPE_NONE>; /* termcount */
        ti,nand-xfer-type = "prefetch-dma";
        ti,nand-ecc-opt = "bch16";
        ti,elm-id = <&elm>;
        #address-cells = <1>;
        #size-cells = <1>;

        /* NAND generic properties */
        nand-bus-width = <8>;
        rb-gpios = <&gpmc 0 GPIO_ACTIVE_HIGH>;  /* gpmc_wait0 */

        /* GPMC properties*/
        gpmc,device-width = <1>;

        partition@0 {
          label = "NAND.SPL";
          reg = <0x00000000 0x00040000>;
        };
        partition@1 {
          label = "NAND.SPL.backup1";
          reg = <0x00040000 0x00040000>;
        };
      };
    };