linux-kernel - [PATCH v2] add support for Mediatek Command-Queue DMA controller on MT6765 SoC

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Date:   Wed, 17 Oct 2018 17:36:57 +0800
From:   <shun-chih.yu@...iatek.com>
To:     Sean Wang <sean.wang@...iatek.com>, Vinod Koul <vkoul@...nel.org>,
        "Rob Herring" <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "Dan Williams" <dan.j.williams@...el.com>
CC:     <dmaengine@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <srv_wsdupstream@...iatek.com>
Subject: [PATCH v2] add support for Mediatek Command-Queue DMA controller on MT6765 SoC 


Changes since v1:
- remove unused macros, typos
- leverage ASYNC_TX_ENABLE_CHANNEL_SWITCH to maintain DMA descriptor list


This patchset introduces support for MediaTek Command-Queue DMA controller.

MediaTek Command-Queue DMA controller (CQDMA) on MT6765 SoC is dedicated to memory-to-memory transfer through queue-based descriptor management.

There are only 3 physical channels inside CQDMA, while the driver is extended to support 32 virtual channels for multiple dma users to issue dma requests onto the CQDMA simultaneously.


Shun-Chih Yu (2):
  dt-bindings: dmaengine: Add MediaTek Command-Queue DMA controller
    bindings
  dmaengine: mediatek: Add MediaTek Command-Queue DMA controller for
    MT6765 SoC

 .../devicetree/bindings/dma/mtk-cqdma.txt          |   31 +
 drivers/dma/mediatek/Kconfig                       |   13 +
 drivers/dma/mediatek/Makefile                      |    1 +
 drivers/dma/mediatek/mtk-cqdma.c                   |  943 ++++++++++++++++++++
 4 files changed, 988 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dma/mtk-cqdma.txt
 create mode 100644 drivers/dma/mediatek/mtk-cqdma.c