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Open Menu / Documentation / devicetree / bindings / memory-controllers / ingenic,nemc.yaml
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/memory-controllers/ingenic,nemc.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Ingenic SoCs NAND / External Memory Controller (NEMC) devicetree bindings

maintainers:
  - Paul Cercueil <paul@crapouillou.net>

properties:
  $nodename:
    pattern: "^memory-controller@[0-9a-f]+$"

  compatible:
    oneOf:
      - enum:
          - ingenic,jz4740-nemc
          - ingenic,jz4780-nemc
      - items:
          - const: ingenic,jz4725b-nemc
          - const: ingenic,jz4740-nemc

  "#address-cells":
    const: 2

  "#size-cells":
    const: 1

  ranges: true

  reg:
    maxItems: 1

  clocks:
    maxItems: 1

patternProperties:
  ".*@[0-9]+$":
    type: object
    properties:
      reg:
        minItems: 1
        maxItems: 255

      ingenic,nemc-bus-width:
        $ref: /schemas/types.yaml#/definitions/uint32
        enum: [8, 16]
        description: Specifies the bus width in bits.

      ingenic,nemc-tAS:
        $ref: /schemas/types.yaml#/definitions/uint32
        description: Address setup time in nanoseconds.

      ingenic,nemc-tAH:
        $ref: /schemas/types.yaml#/definitions/uint32
        description: Address hold time in nanoseconds.

      ingenic,nemc-tBP:
        $ref: /schemas/types.yaml#/definitions/uint32
        description: Burst pitch time in nanoseconds.

      ingenic,nemc-tAW:
        $ref: /schemas/types.yaml#/definitions/uint32
        description: Address wait time in nanoseconds.

      ingenic,nemc-tSTRV:
        $ref: /schemas/types.yaml#/definitions/uint32
        description: Static memory recovery time in nanoseconds.

    required:
      - reg

required:
  - compatible
  - "#address-cells"
  - "#size-cells"
  - ranges
  - reg
  - clocks

additionalProperties: false

examples:
  - |
    #include <dt-bindings/clock/jz4780-cgu.h>
    #include <dt-bindings/gpio/gpio.h>
    nemc: memory-controller@13410000 {
      compatible = "ingenic,jz4780-nemc";
      reg = <0x13410000 0x10000>;
      #address-cells = <2>;
      #size-cells = <1>;
      ranges = <1 0 0x1b000000 0x1000000>,
         <2 0 0x1a000000 0x1000000>,
         <3 0 0x19000000 0x1000000>,
         <4 0 0x18000000 0x1000000>,
         <5 0 0x17000000 0x1000000>,
         <6 0 0x16000000 0x1000000>;

      clocks = <&cgu JZ4780_CLK_NEMC>;

      ethernet@6 {
        compatible = "davicom,dm9000";
        davicom,no-eeprom;

        pinctrl-names = "default";
        pinctrl-0 = <&pins_nemc_cs6>;

        reg = <6 0 1>, /* addr */
              <6 2 1>; /* data */

        ingenic,nemc-tAS = <15>;
        ingenic,nemc-tAH = <10>;
        ingenic,nemc-tBP = <20>;
        ingenic,nemc-tAW = <50>;
        ingenic,nemc-tSTRV = <100>;

        reset-gpios = <&gpf 12 GPIO_ACTIVE_HIGH>;
        vcc-supply = <&eth0_power>;

        interrupt-parent = <&gpe>;
        interrupts = <19 4>;
      };
    };