# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/arm/arm,vexpress-juno.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: ARM Versatile Express and Juno Boards
maintainers:
- Sudeep Holla <sudeep.holla@arm.com>
- Linus Walleij <linus.walleij@linaro.org>
description: |+
ARM's Versatile Express platform were built as reference designs for exploring
multicore Cortex-A class systems. The Versatile Express family contains both
32 bit (Aarch32) and 64 bit (Aarch64) systems.
The board consist of a motherboard and one or more daughterboards (tiles). The
motherboard provides a set of peripherals. Processor and RAM "live" on the
tiles.
The motherboard and each core tile should be described by a separate Device
Tree source file, with the tile's description including the motherboard file
using an include directive. As the motherboard can be initialized in one of
two different configurations ("memory maps"), care must be taken to include
the correct one.
When a new generation of boards were introduced under the name "Juno", these
shared to many common characteristics with the Versatile Express that the
"arm,vexpress" compatible was retained in the root node, and these are
included in this binding schema as well.
The root node indicates the CPU SoC on the core tile, and this
is a daughterboard to the main motherboard. The name used in the compatible
string shall match the name given in the core tile's technical reference
manual, followed by "arm,vexpress" as an additional compatible value. If
further subvariants are released of the core tile, even more fine-granular
compatible strings with up to three compatible strings are used.
properties:
$nodename:
const: '/'
compatible:
oneOf:
- description: CoreTile Express A9x4 (V2P-CA9) has 4 Cortex A9 CPU cores
in MPCore configuration in a test chip on the core tile. See ARM
DUI 0448I. This was the first Versatile Express platform.
items:
- const: arm,vexpress,v2p-ca9
- const: arm,vexpress
- description: CoreTile Express A5x2 (V2P-CA5s) has 2 Cortex A5 CPU cores
in a test chip on the core tile. It is intended to evaluate NEON, FPU
and Jazelle support in the Cortex A5 family. See ARM DUI 0541C.
items:
- const: arm,vexpress,v2p-ca5s
- const: arm,vexpress
- description: Coretile Express A15x2 (V2P-CA15) has 2 Cortex A15 CPU
cores in a MPCore configuration in a test chip on the core tile. See
ARM DUI 0604F.
items:
- const: arm,vexpress,v2p-ca15
- const: arm,vexpress
- description: CoreTile Express A15x4 (V2P-CA15, HBI-0237A) has 4 Cortex
A15 CPU cores in a test chip on the core tile. This is the first test
chip called "TC1".
items:
- const: arm,vexpress,v2p-ca15,tc1
- const: arm,vexpress,v2p-ca15
- const: arm,vexpress
- description: Coretile Express A15x2 A7x3 (V2P-CA15_A7) has 2 Cortex A15
CPU cores and 3 Cortex A7 cores in a big.LITTLE MPCore configuration
in a test chip on the core tile. See ARM DDI 0503I.
items:
- const: arm,vexpress,v2p-ca15_a7
- const: arm,vexpress
- description: LogicTile Express 20MG (V2F-1XV7) has 2 Cortex A53 CPU
cores in a test chip on the core tile. See ARM DDI 0498D.
items:
- const: arm,vexpress,v2f-1xv7,ca53x2
- const: arm,vexpress,v2f-1xv7
- const: arm,vexpress
- description: Arm Versatile Express Juno "r0" (the first Juno board,
V2M-Juno) was introduced as a vehicle for evaluating big.LITTLE on
AArch64 CPU cores. It has 2 Cortex A57 CPU cores and 4 Cortex A53
cores in a big.LITTLE configuration. It also features the MALI T624
GPU. See ARM document 100113_0000_07_en.
items:
- const: arm,juno
- const: arm,vexpress
- description: Arm Versatile Express Juno r1 Development Platform
(V2M-Juno r1) was introduced mainly aimed at development of PCIe
based systems. Juno r1 also has support for AXI masters placed on
the TLX connectors to join the coherency domain. Otherwise it is the
same configuration as Juno r0. See ARM document 100122_0100_06_en.
items:
- const: arm,juno-r1
- const: arm,juno
- const: arm,vexpress
- description: Arm Versatile Express Juno r2 Development Platform
(V2M-Juno r2). It has the same feature set as Juno r0 and r1. See
ARM document 100114_0200_04_en.
items:
- const: arm,juno-r2
- const: arm,juno
- const: arm,vexpress
- description: Arm AEMv8a Versatile Express Real-Time System Model
(VE RTSM) is a programmers view of the Versatile Express with Arm
v8A hardware. See ARM DUI 0575D.
items:
- const: arm,rtsm_ve,aemv8a
- const: arm,vexpress
- description: Arm FVP (Fixed Virtual Platform) base model revision C
See ARM Document 100964_1190_00_en.
items:
- const: arm,fvp-base-revc
- const: arm,vexpress
- description: Arm Foundation model for Aarch64
items:
- const: arm,foundation-aarch64
- const: arm,vexpress
arm,vexpress,position:
description: When daughterboards are stacked on one site, their position
in the stack be be described this attribute.
$ref: /schemas/types.yaml#/definitions/uint32
minimum: 0
maximum: 3
arm,vexpress,dcc:
description: When describing tiles consisting of more than one DCC, its
number can be specified with this attribute.
$ref: /schemas/types.yaml#/definitions/uint32
minimum: 0
maximum: 3
patternProperties:
"^bus@[0-9a-f]+$":
description: Static Memory Bus (SMB) node, if this exists it describes
the connection between the motherboard and any tiles. Sometimes the
compatible is placed directly under this node, sometimes it is placed
in a subnode named "motherboard-bus". Sometimes the compatible includes
"arm,vexpress,v2?-p1" sometimes (on software models) is is just
"simple-bus". If the compatible is placed in the "motherboard-bus" node,
it is stricter and always has two compatibles.
type: object
$ref: /schemas/simple-bus.yaml
unevaluatedProperties: false
properties:
compatible:
oneOf:
- items:
- enum:
- arm,vexpress,v2m-p1
- arm,vexpress,v2p-p1
- const: simple-bus
- const: simple-bus
patternProperties:
'^motherboard-bus@':
type: object
description: The motherboard description provides a single "motherboard"
node using 2 address cells corresponding to the Static Memory Bus
used between the motherboard and the tile. The first cell defines the
Chip Select (CS) line number, the second cell address offset within
the CS. All interrupt lines between the motherboard and the tile
are active high and are described using single cell.
properties:
"#address-cells":
const: 2
"#size-cells":
const: 1
ranges: true
compatible:
items:
- enum:
- arm,vexpress,v2m-p1
- arm,vexpress,v2p-p1
- const: simple-bus
arm,v2m-memory-map:
description: This describes the memory map type.
$ref: /schemas/types.yaml#/definitions/string
enum:
- rs1
- rs2
arm,hbi:
$ref: /schemas/types.yaml#/definitions/uint32
description: This indicates the ARM HBI (Hardware Board ID), this is
ARM's unique board model ID, visible on the PCB's silkscreen.
arm,vexpress,site:
description: As Versatile Express can be configured in number of physically
different setups, the device tree should describe platform topology.
For this reason the root node and main motherboard node must define this
property, describing the physical location of the children nodes.
0 means motherboard site, while 1 and 2 are daughterboard sites, and
0xf means "sisterboard" which is the site containing the main CPU tile.
$ref: /schemas/types.yaml#/definitions/uint32
minimum: 0
maximum: 15
required:
- compatible
additionalProperties:
type: object
required:
- compatible
allOf:
- if:
properties:
compatible:
contains:
enum:
- arm,vexpress,v2p-ca9
- arm,vexpress,v2p-ca5s
- arm,vexpress,v2p-ca15
- arm,vexpress,v2p-ca15_a7
- arm,vexpress,v2f-1xv7,ca53x2
then:
required:
- arm,hbi
additionalProperties: true
...