Commit befc8236 authored by Joseph Lo's avatar Joseph Lo Committed by Rob Herring

dt-bindings: memory: tegra: Add external memory controller binding for Tegra210

Add the binding document for the external memory controller (EMC) which
communicates with external LPDDR4 devices. It includes the bindings of
the EMC node and a sub-node of EMC table which under the reserved memory
node. The EMC table contains the data of the rates that EMC supported.
Signed-off-by: default avatarJoseph Lo <josephl@nvidia.com>
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
Signed-off-by: default avatarRob Herring <robh@kernel.org>
parent 18bc9915
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/memory-controllers/nvidia,tegra210-emc.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: NVIDIA Tegra210 SoC External Memory Controller
maintainers:
- Thierry Reding <thierry.reding@gmail.com>
- Jon Hunter <jonathanh@nvidia.com>
description: |
The EMC interfaces with the off-chip SDRAM to service the request stream
sent from the memory controller.
properties:
compatible:
const: nvidia,tegra210-emc
reg:
maxItems: 3
clocks:
items:
- description: external memory clock
clock-names:
items:
- const: emc
interrupts:
items:
- description: EMC general interrupt
memory-region:
$ref: /schemas/types.yaml#/definitions/phandle
description:
phandle to a reserved memory region describing the table of EMC
frequencies trained by the firmware
nvidia,memory-controller:
$ref: /schemas/types.yaml#/definitions/phandle
description:
phandle of the memory controller node
required:
- compatible
- reg
- clocks
- clock-names
- nvidia,memory-controller
additionalProperties: false
examples:
- |
#include <dt-bindings/clock/tegra210-car.h>
#include <dt-bindings/interrupt-controller/arm-gic.h>
reserved-memory {
#address-cells = <1>;
#size-cells = <1>;
ranges;
emc_table: emc-table@83400000 {
compatible = "nvidia,tegra210-emc-table";
reg = <0x83400000 0x10000>;
};
};
external-memory-controller@7001b000 {
compatible = "nvidia,tegra210-emc";
reg = <0x7001b000 0x1000>,
<0x7001e000 0x1000>,
<0x7001f000 0x1000>;
clocks = <&tegra_car TEGRA210_CLK_EMC>;
clock-names = "emc";
interrupts = <GIC_SPI 78 IRQ_TYPE_LEVEL_HIGH>;
memory-region = <&emc_table>;
nvidia,memory-controller = <&mc>;
};
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