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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/soc/aspeed/xdma.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Aspeed AST25XX and AST26XX XDMA Engine
maintainers:
- Eddie James <eajames@linux.ibm.com>
description: |
This binding describes the XDMA Engine embedded in the AST2500 and AST2600
SOCs. The XDMA engine can perform automatic DMA operations over PCI between
the SOC (acting as a BMC) and a host processor.
properties:
compatible:
enum:
- aspeed,ast2500-xdma
- aspeed,ast2600-xdma
reg:
maxItems: 1
clocks:
maxItems: 1
resets:
minItems: 1
maxItems: 2
reset-names:
items:
- const: device
- const: root-complex
interrupts:
items:
- description: global interrupt for the XDMA engine
- description: PCI-E reset or PERST interrupt
aspeed,scu:
description: a reference to the System Control Unit node of the Aspeed SOC.
allOf:
- $ref: /schemas/types.yaml#/definitions/phandle
aspeed,pcie-device:
description: describes which PCI-E device the XDMA engine should use
allOf:
- $ref: /schemas/types.yaml#/definitions/string
- enum: [ bmc, vga ]
required:
- compatible
- reg
- clocks
- resets
- interrupts-extended
- aspeed,scu
- memory-region
if:
properties:
compatible:
contains:
const: aspeed,ast2600-xdma
then:
required:
- reset-names
additionalProperties: false
examples:
- |
#include <dt-bindings/clock/ast2600-clock.h>
#include <dt-bindings/interrupt-controller/arm-gic.h>
#include <dt-bindings/interrupt-controller/aspeed-scu-ic.h>
syscon: syscon@1e6e2000 {
reg = <0x1e6e2000 0x1000>;
ranges = <0 0x1e6e2000 0x1000>;
#address-cells = <1>;
#size-cells = <1>;
#clock-cells = <1>;
#reset-cells = <1>;
scu_ic0: interrupt-controller@560 {
reg = <0x560 0x4>;
interrupt-controller;
#interrupt-cells = <1>;
};
};
xdma@1e6e7000 {
compatible = "aspeed,ast2600-xdma";
reg = <0x1e6e7000 0x100>;
clocks = <&syscon ASPEED_CLK_GATE_BCLK>;
resets = <&syscon ASPEED_RESET_DEV_XDMA>, <&syscon ASPEED_RESET_RC_XDMA>;
reset-names = "device", "root-complex";
interrupts-extended = <&gic GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>,
<&scu_ic0 ASPEED_AST2600_SCU_IC0_PCIE_PERST_LO_TO_HI>;
aspeed,scu = <&syscon>;
aspeed,pcie-device = "bmc";
memory-region = <&vga_memory>;
};
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