# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/memory-controllers/nvidia,tegra186-mc.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: NVIDIA Tegra186 (and later) SoC Memory Controller
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maintainers:
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- Jon Hunter <jonathanh@nvidia.com>
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- Thierry Reding <thierry.reding@gmail.com>
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description: |
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The NVIDIA Tegra186 SoC features a 128 bit memory controller that is split
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into four 32 bit channels to support LPDDR4 with x16 subpartitions. The MC
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handles memory requests for 40-bit virtual addresses from internal clients
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and arbitrates among them to allocate memory bandwidth.
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Up to 15 GiB of physical memory can be supported. Security features such as
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encryption of traffic to and from DRAM via general security apertures are
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available for video and other secure applications, as well as DRAM ECC for
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automotive safety applications (single bit error correction and double bit
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error detection).
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properties:
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$nodename:
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pattern: "^memory-controller@[0-9a-f]+$"
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compatible:
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items:
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- enum:
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- nvidia,tegra186-mc
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- nvidia,tegra194-mc
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reg:
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maxItems: 1
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interrupts:
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maxItems: 1
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"#address-cells":
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const: 2
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"#size-cells":
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const: 2
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ranges: true
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dma-ranges: true
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patternProperties:
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"^external-memory-controller@[0-9a-f]+$":
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description:
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The bulk of the work involved in controlling the external memory
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controller on NVIDIA Tegra186 and later is performed on the BPMP. This
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coprocessor exposes the EMC clock that is used to set the frequency at
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which the external memory is clocked and a remote procedure call that
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can be used to obtain the set of available frequencies.
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type: object
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properties:
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compatible:
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items:
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- enum:
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- nvidia,tegra186-emc
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- nvidia,tegra194-emc
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reg:
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maxItems: 1
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interrupts:
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maxItems: 1
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clocks:
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items:
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- description: external memory clock
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clock-names:
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items:
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- const: emc
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nvidia,bpmp:
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$ref: /schemas/types.yaml#/definitions/phandle
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description:
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phandle of the node representing the BPMP
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required:
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- compatible
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- reg
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- interrupts
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- "#address-cells"
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- "#size-cells"
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additionalProperties: false
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examples:
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- |
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#include <dt-bindings/clock/tegra186-clock.h>
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#include <dt-bindings/interrupt-controller/arm-gic.h>
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bus {
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#address-cells = <2>;
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#size-cells = <2>;
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memory-controller@2c00000 {
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compatible = "nvidia,tegra186-mc";
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reg = <0x0 0x02c00000 0x0 0xb0000>;
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interrupts = <GIC_SPI 223 IRQ_TYPE_LEVEL_HIGH>;
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#address-cells = <2>;
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#size-cells = <2>;
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ranges = <0x0 0x02c00000 0x0 0x02c00000 0x0 0xb0000>;
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/*
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* Memory clients have access to all 40 bits that the memory
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* controller can address.
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*/
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dma-ranges = <0x0 0x0 0x0 0x0 0x100 0x0>;
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external-memory-controller@2c60000 {
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compatible = "nvidia,tegra186-emc";
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reg = <0x0 0x02c60000 0x0 0x50000>;
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interrupts = <GIC_SPI 224 IRQ_TYPE_LEVEL_HIGH>;
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clocks = <&bpmp TEGRA186_CLK_EMC>;
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clock-names = "emc";
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nvidia,bpmp = <&bpmp>;
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};
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};
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};
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bpmp: bpmp {
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compatible = "nvidia,tegra186-bpmp";
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#clock-cells = <1>;
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};
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