linux-zen-desktop/Documentation/devicetree/bindings/memory-controllers/snps,dw-umctl2-ddrc.yaml

# SPDX-License-Identifier: GPL-2.0-only
%YAML 1.2
---
$id: http://devicetree.org/schemas/memory-controllers/snps,dw-umctl2-ddrc.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Synopsys DesignWare Universal Multi-Protocol Memory Controller

maintainers:
  - Krzysztof Kozlowski <krzk@kernel.org>
  - Michal Simek <michal.simek@amd.com>

description: |
  Synopsys DesignWare Enhanced uMCTL2 DDR Memory Controller is capable of
  working with the memory devices supporting up to (LP)DDR4 protocol. It can
  be equipped with SEC/DEC ECC feature if DRAM data bus width is either
  16-bits or 32-bits or 64-bits wide.

  For instance the ZynqMP DDR controller is based on the DW uMCTL2 v2.40a
  controller. It has an optional SEC/DEC ECC support in 64- and 32-bits
  bus width configurations.

properties:
  compatible:
    oneOf:
      - deprecated: true
        description: Synopsys DW uMCTL2 DDR controller v3.80a
        const: snps,ddrc-3.80a
      - description: Synopsys DW uMCTL2 DDR controller
        const: snps,dw-umctl2-ddrc
      - description: Xilinx ZynqMP DDR controller v2.40a
        const: xlnx,zynqmp-ddrc-2.40a

  interrupts:
    description:
      DW uMCTL2 DDRC IP-core provides individual IRQ signal for each event":"
      ECC Corrected Error, ECC Uncorrected Error, ECC Address Protection,
      Scrubber-Done signal, DFI Parity/CRC Error. Some platforms may have the
      signals merged before they reach the IRQ controller or have some of them
      absent in case if the corresponding feature is unavailable/disabled.
    minItems: 1
    maxItems: 5

  interrupt-names:
    minItems: 1
    maxItems: 5
    oneOf:
      - description: Common ECC CE/UE/Scrubber/DFI Errors IRQ
        items:
          - const: ecc
      - description: Individual ECC CE/UE/Scrubber/DFI Errors IRQs
        items:
          enum: [ ecc_ce, ecc_ue, ecc_ap, ecc_sbr, dfi_e ]

  reg:
    maxItems: 1

  clocks:
    description:
      A standard set of the clock sources contains CSRs bus clock, AXI-ports
      reference clock, DDRC core clock, Scrubber standalone clock
      (synchronous to the DDRC clock).
    minItems: 1
    maxItems: 4

  clock-names:
    minItems: 1
    maxItems: 4
    items:
      enum: [ pclk, aclk, core, sbr ]

  resets:
    description:
      Each clock domain can have separate reset signal.
    minItems: 1
    maxItems: 4

  reset-names:
    minItems: 1
    maxItems: 4
    items:
      enum: [ prst, arst, core, sbr ]

required:
  - compatible
  - reg
  - interrupts

additionalProperties: false

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

    memory-controller@fd070000 {
      compatible = "xlnx,zynqmp-ddrc-2.40a";
      reg = <0xfd070000 0x30000>;

      interrupt-parent = <&gic>;
      interrupts = <GIC_SPI 112 IRQ_TYPE_LEVEL_HIGH>;
      interrupt-names = "ecc";
    };
  - |
    #include <dt-bindings/interrupt-controller/irq.h>

    memory-controller@3d400000 {
      compatible = "snps,dw-umctl2-ddrc";
      reg = <0x3d400000 0x400000>;

      interrupts = <147 IRQ_TYPE_LEVEL_HIGH>, <148 IRQ_TYPE_LEVEL_HIGH>,
                   <149 IRQ_TYPE_LEVEL_HIGH>, <150 IRQ_TYPE_LEVEL_HIGH>;
      interrupt-names = "ecc_ce", "ecc_ue", "ecc_sbr", "dfi_e";

      clocks = <&pclk>, <&aclk>, <&core_clk>, <&sbr_clk>;
      clock-names = "pclk", "aclk", "core", "sbr";
    };
...