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dt-bindings: dmaengine: Add Loongson Multi-Channel DMA controller

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The Loongson-2K0300/Loongson-2K3000 have built-in multi-channel DMA
controllers, which are similar except for some of the register offsets
and number of channels.

Obviously, this is quite different from the APB DMA controller used in
the Loongson-2K0500/Loongson-2K1000, such as the latter being a
single-channel DMA controller.

To avoid cluttering a single dt-binding file, add a new yaml file.

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
Reviewed-by: Huacai Chen <chenhuacai@loongson.cn>
Link: https://patch.msgid.link/135802de72b84f643d0b0624f3f79f13777147a1.1772853681.git.zhoubinbin@loongson.cn
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Binbin Zhou 2026-03-07 11:25:36 +08:00 committed by Vinod Koul
parent 9de4303fc0
commit 7a65e81e8e
2 changed files with 83 additions and 1 deletions
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81
Documentation/devicetree/bindings/dma/loongson,ls2k0300-dma.yaml Normal file
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@ -0,0 +1,81 @@
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/dma/loongson,ls2k0300-dma.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Looongson-2 Multi-Channel DMA controller
description:
The Loongson-2 Multi-Channel DMA controller is used for transferring data
between system memory and the peripherals on the APB bus.
maintainers:
- Binbin Zhou <zhoubinbin@loongson.cn>
allOf:
- $ref: dma-controller.yaml#
properties:
compatible:
enum:
- loongson,ls2k0300-dma
- loongson,ls2k3000-dma
reg:
maxItems: 1
interrupts:
description:
Should contain all of the per-channel DMA interrupts in ascending order
with respect to the DMA channel index.
minItems: 4
maxItems: 8
clocks:
maxItems: 1
'#dma-cells':
const: 2
description: |
DMA request from clients consists of 2 cells:
1. Channel index
2. Transfer request factor number, If no transfer factor, use 0.
The number is SoC-specific, and this should be specified with
relation to the device to use the DMA controller.
dma-channels:
enum: [4, 8]
required:
- compatible
- reg
- interrupts
- clocks
- '#dma-cells'
- dma-channels
unevaluatedProperties: false
examples:
- |
#include <dt-bindings/interrupt-controller/irq.h>
#include <dt-bindings/clock/loongson,ls2k-clk.h>
dma-controller@1612c000 {
compatible = "loongson,ls2k0300-dma";
reg = <0x1612c000 0xff>;
interrupt-parent = <&liointc0>;
interrupts = <23 IRQ_TYPE_LEVEL_HIGH>,
<24 IRQ_TYPE_LEVEL_HIGH>,
<25 IRQ_TYPE_LEVEL_HIGH>,
<26 IRQ_TYPE_LEVEL_HIGH>,
<27 IRQ_TYPE_LEVEL_HIGH>,
<28 IRQ_TYPE_LEVEL_HIGH>,
<29 IRQ_TYPE_LEVEL_HIGH>,
<30 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clk LS2K0300_CLK_APB_GATE>;
#dma-cells = <2>;
dma-channels = <8>;
};
...

3
MAINTAINERS
View File

@ -14948,10 +14948,11 @@ S: Maintained
F: Documentation/devicetree/bindings/gpio/loongson,ls-gpio.yaml
F: drivers/gpio/gpio-loongson-64bit.c
LOONGSON-2 APB DMA DRIVER
LOONGSON-2 DMA DRIVER
M: Binbin Zhou <zhoubinbin@loongson.cn>
L: dmaengine@vger.kernel.org
S: Maintained
F: Documentation/devicetree/bindings/dma/loongson,ls2k0300-dma.yaml
F: Documentation/devicetree/bindings/dma/loongson,ls2x-apbdma.yaml
F: drivers/dma/loongson/loongson2-apb-dma.c