xref: /linux/Documentation/devicetree/bindings/memory-controllers/st,stm32-fmc2-ebi.yaml (revision 621cde16e49b3ecf7d59a8106a20aaebfb4a59a9)

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

title: STMicroelectronics Flexible Memory Controller 2 (FMC2)

description: |
  The FMC2 functional block makes the interface with: synchronous and
  asynchronous static devices (such as PSNOR, PSRAM or other memory-mapped
  peripherals) and NAND flash memories.
  Its main purposes are:
    - to translate AXI transactions into the appropriate external device
      protocol
    - to meet the access time requirements of the external devices
  All external devices share the addresses, data and control signals with the
  controller. Each external device is accessed by means of a unique Chip
  Select. The FMC2 performs only one access at a time to an external device.

maintainers:
  - Christophe Kerello <christophe.kerello@foss.st.com>

properties:
  compatible:
    enum:
      - st,stm32mp1-fmc2-ebi
      - st,stm32mp25-fmc2-ebi

  reg:
    maxItems: 1

  clocks:
    maxItems: 1

  resets:
    maxItems: 1

  power-domains:
    maxItems: 1

  "#address-cells":
    const: 2

  "#size-cells":
    const: 1

  ranges:
    description: |
      Reflects the memory layout with four integer values per bank. Format:
      <bank-number> 0 <address of the bank> <size>

  access-controllers:
    minItems: 1
    maxItems: 2

patternProperties:
  "^.*@[0-4],[a-f0-9]+$":
    additionalProperties: true
    type: object
    $ref: mc-peripheral-props.yaml#

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

additionalProperties: false

examples:
  - |
    #include <dt-bindings/interrupt-controller/arm-gic.h>
    #include <dt-bindings/clock/stm32mp1-clks.h>
    #include <dt-bindings/reset/stm32mp1-resets.h>
    memory-controller@58002000 {
      #address-cells = <2>;
      #size-cells = <1>;
      compatible = "st,stm32mp1-fmc2-ebi";
      reg = <0x58002000 0x1000>;
      clocks = <&rcc FMC_K>;
      resets = <&rcc FMC_R>;

      ranges = <0 0 0x60000000 0x04000000>, /* EBI CS 1 */
               <1 0 0x64000000 0x04000000>, /* EBI CS 2 */
               <2 0 0x68000000 0x04000000>, /* EBI CS 3 */
               <3 0 0x6c000000 0x04000000>, /* EBI CS 4 */
               <4 0 0x80000000 0x10000000>; /* NAND */

      psram@0,0 {
        compatible = "mtd-ram";
        reg = <0 0x00000000 0x100000>;
        bank-width = <2>;

        st,fmc2-ebi-cs-transaction-type = <1>;
        st,fmc2-ebi-cs-address-setup-ns = <60>;
        st,fmc2-ebi-cs-data-setup-ns = <30>;
        st,fmc2-ebi-cs-bus-turnaround-ns = <5>;
      };

      nand-controller@4,0 {
        #address-cells = <1>;
        #size-cells = <0>;
        compatible = "st,stm32mp1-fmc2-nfc";
        reg = <4 0x00000000 0x1000>,
              <4 0x08010000 0x1000>,
              <4 0x08020000 0x1000>,
              <4 0x01000000 0x1000>,
              <4 0x09010000 0x1000>,
              <4 0x09020000 0x1000>;
        interrupts = <GIC_SPI 48 IRQ_TYPE_LEVEL_HIGH>;
        dmas = <&mdma1 20 0x2 0x12000a02 0x0 0x0>,
               <&mdma1 20 0x2 0x12000a08 0x0 0x0>,
               <&mdma1 21 0x2 0x12000a0a 0x0 0x0>;
        dma-names = "tx", "rx", "ecc";

        nand@0 {
          reg = <0>;
          nand-on-flash-bbt;
          #address-cells = <1>;
          #size-cells = <1>;
        };
      };
    };

...