Re: [PATCH 0/3] Add Loongson-2K0300 APB DMA mux support

[Frank Li <Frank.li@oss.nxp.com>]

On Tue, Sep 22, 2026 at 05:25:41PM +0800, Binbin Zhou wrote:
> Hi all:
>
> Loongson-2K0300 integrates a CMC DMA controller with 8 physical
> channels. Peripheral DMA requests are not hard-wired to these channels;
> they are routed through the CHIP_CTRL13/14/15 DMA_MAP fields.
>
> This series adds support for that DMA request router.
>
> Patch 1 adds the DT binding constants for the peripheral request IDs.
> Patch 2 adds the DT binding documentation for the DMA mux.
> Patch 3 adds the driver, Kconfig symbol and Makefile entry.
>
> The driver registers with of_dma_router_register(). In the route
> allocation callback it validates the <request> <channel> <flags>
> specifier, programs the SoC-specific route register, and forwards
> <channel> <flags> to the parent CMC DMA controller.

Is it possible use standard mux interface?

drivers/mux/mmio.c

Frank

>
> Thanks.
> Binbin.
>
> Binbin Zhou (3):
>   dt-bindings: dma: loongson: Add Loongson-2 DMA mux request IDs
>   dt-bindings: dma: loongson: Add Loongson-2K0300 DMA mux support
>   dmaengine: loongson: Add Loongson-2K0300 APB DMA mux driver
>
>  .../dma/loongson,ls2k0300-dmamux.yaml         |  49 +++
>  MAINTAINERS                                   |   3 +
>  drivers/dma/loongson/Kconfig                  |  13 +
>  drivers/dma/loongson/Makefile                 |   1 +
>  drivers/dma/loongson/loongson2-apb-dmamux.c   | 380 ++++++++++++++++++
>  .../dt-bindings/dma/loongson,ls2k-dmamux.h    |  56 +++
>  6 files changed, 502 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/dma/loongson,ls2k0300-dmamux.yaml
>  create mode 100644 drivers/dma/loongson/loongson2-apb-dmamux.c
>  create mode 100644 include/dt-bindings/dma/loongson,ls2k-dmamux.h
>
>
> base-commit: 0a8dda0a15d3926422d286567f945a05328a4ac6
> --
> 2.52.0
>