mirror of
https://github.com/torvalds/linux.git
synced 2026-04-18 06:44:00 -04:00
ffff5e7275
The external memory controller found on Tegra210 can use throttling of the EMC frequency in order to reduce the memory chip temperature. Mark the memory controller as a cooling device to take advantage of this functionality. Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Thierry Reding <treding@nvidia.com>
98 lines
2.3 KiB
YAML
98 lines
2.3 KiB
YAML
# 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
|
|
|
|
"#interconnect-cells":
|
|
const: 0
|
|
|
|
memory-region:
|
|
maxItems: 1
|
|
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
|
|
|
|
operating-points-v2:
|
|
description:
|
|
Should contain freqs and voltages and opp-supported-hw property, which
|
|
is a bitfield indicating SoC speedo ID mask.
|
|
|
|
allOf:
|
|
- $ref: /schemas/thermal/thermal-cooling-devices.yaml
|
|
|
|
required:
|
|
- compatible
|
|
- reg
|
|
- clocks
|
|
- clock-names
|
|
- nvidia,memory-controller
|
|
|
|
unevaluatedProperties: 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>;
|
|
operating-points-v2 = <&dvfs_opp_table>;
|
|
|
|
#interconnect-cells = <0>;
|
|
#cooling-cells = <2>;
|
|
};
|