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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/nvidia,tegra186-mc.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: NVIDIA Tegra186 (and later) SoC Memory Controller
maintainers:
- Jon Hunter <jonathanh@nvidia.com>
- Thierry Reding <thierry.reding@gmail.com>
description: |
The NVIDIA Tegra186 SoC features a 128 bit memory controller that is split
into four 32 bit channels to support LPDDR4 with x16 subpartitions. The MC
handles memory requests for 40-bit virtual addresses from internal clients
and arbitrates among them to allocate memory bandwidth.
Up to 15 GiB of physical memory can be supported. Security features such as
encryption of traffic to and from DRAM via general security apertures are
available for video and other secure applications, as well as DRAM ECC for
automotive safety applications (single bit error correction and double bit
error detection).
properties:
$nodename:
pattern: "^memory-controller@[0-9a-f]+$"
compatible:
items:
- enum:
- nvidia,tegra186-mc
- nvidia,tegra194-mc
reg:
maxItems: 1
interrupts:
maxItems: 1
"#address-cells":
const: 2
"#size-cells":
const: 2
ranges: true
dma-ranges: true
patternProperties:
"^external-memory-controller@[0-9a-f]+$":
description:
The bulk of the work involved in controlling the external memory
controller on NVIDIA Tegra186 and later is performed on the BPMP. This
coprocessor exposes the EMC clock that is used to set the frequency at
which the external memory is clocked and a remote procedure call that
can be used to obtain the set of available frequencies.
type: object
properties:
compatible:
items:
- enum:
- nvidia,tegra186-emc
- nvidia,tegra194-emc
reg:
maxItems: 1
interrupts:
maxItems: 1
clocks:
items:
- description: external memory clock
clock-names:
items:
- const: emc
nvidia,bpmp:
$ref: /schemas/types.yaml#/definitions/phandle
description:
phandle of the node representing the BPMP
required:
- compatible
- reg
- interrupts
- "#address-cells"
- "#size-cells"
additionalProperties: false
examples:
- |
#include <dt-bindings/clock/tegra186-clock.h>
#include <dt-bindings/interrupt-controller/arm-gic.h>
memory-controller@2c00000 {
compatible = "nvidia,tegra186-mc";
reg = <0x0 0x02c00000 0x0 0xb0000>;
interrupts = <GIC_SPI 223 IRQ_TYPE_LEVEL_HIGH>;
#address-cells = <2>;
#size-cells = <2>;
ranges = <0x0 0x02c00000 0x02c00000 0x0 0xb0000>;
/*
* Memory clients have access to all 40 bits that the memory
* controller can address.
*/
dma-ranges = <0x0 0x0 0x0 0x0 0x100 0x0>;
external-memory-controller@2c60000 {
compatible = "nvidia,tegra186-emc";
reg = <0x0 0x02c60000 0x0 0x50000>;
interrupts = <GIC_SPI 224 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&bpmp TEGRA186_CLK_EMC>;
clock-names = "emc";
nvidia,bpmp = <&bpmp>;
};
};
bpmp: bpmp {
compatible = "nvidia,tegra186-bpmp";
#clock-cells = <1>;
};
|
