Re: [PATCH 1/3] dt-bindings: dma: loongson: Add Loongson-2 DMA mux request IDs

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

On Tue, Sep 22, 2026 at 05:25:42PM +0800, Binbin Zhou wrote:
> Add DT binding constants for the Loongson-2 DMA mux.
>
> The header defines the peripheral request IDs used in the DMA specifier
> <request channel flags> for Loongson-2K0300, covering UART0-9, I2C0-3,
> SPI2/3, I2S, ADC and CAN0-3. It also documents the channel-pair semantics
> for peripherals that use paired DMA channels.
>
> Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
> ---
>  MAINTAINERS                                   |  1 +
>  .../dt-bindings/dma/loongson,ls2k-dmamux.h    | 56 +++++++++++++++++++
>  2 files changed, 57 insertions(+)
>  create mode 100644 include/dt-bindings/dma/loongson,ls2k-dmamux.h
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index c31b81eb42d7..b021fb623446 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -15347,6 +15347,7 @@ F:	Documentation/devicetree/bindings/dma/loongson,ls2k0300-dma.yaml
>  F:	Documentation/devicetree/bindings/dma/loongson,ls2x-apbdma.yaml
>  F:	drivers/dma/loongson/loongson2-apb-cmc-dma.c
>  F:	drivers/dma/loongson/loongson2-apb-dma.c
> +F:	include/dt-bindings/dma/loongson,ls2k-dmamux.h
>
>  LOONGSON LS2X I2C DRIVER
>  M:	Binbin Zhou <zhoubinbin@loongson.cn>
> diff --git a/include/dt-bindings/dma/loongson,ls2k-dmamux.h b/include/dt-bindings/dma/loongson,ls2k-dmamux.h
> new file mode 100644
> index 000000000000..dcc8df86befb
> --- /dev/null
> +++ b/include/dt-bindings/dma/loongson,ls2k-dmamux.h
> @@ -0,0 +1,56 @@
> +/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
> +/*
> + * Loongson-2 SoC DMA Mux dt-bindings
> + *
> + * DMA specifier format:
> + *   dmas = <&dma_mux <request> <channel> <flags>>;
> + *
> + * The <channel> cell selects a physical CMC DMA channel (0-7)
> + * For peripherals using channel pairs (UART, I2C, SPI2/3, I2S),
> + * the channel number selects the pair: 0/1 -> pair 0, 2/3 -> pair 1,
> + * 4/5 -> pair 2, 6/7 -> pair 3.
> + *
> + * Copyright (C) 2026 Loongson Technology Corporation Limited
> + */
> +
> +#ifndef _DT_BINDINGS_DMA_LOONGSON_LS2K_DMAMUX_H
> +#define _DT_BINDINGS_DMA_LOONGSON_LS2K_DMAMUX_H
> +
> +/* UART controllers */
> +#define LS2K0300_DMA_UART0		0
> +#define LS2K0300_DMA_UART1		1
> +#define LS2K0300_DMA_UART2		2
> +#define LS2K0300_DMA_UART3		3
> +#define LS2K0300_DMA_UART4		4
> +#define LS2K0300_DMA_UART5		5
> +#define LS2K0300_DMA_UART6		6
> +#define LS2K0300_DMA_UART7		7
> +#define LS2K0300_DMA_UART8		8
> +#define LS2K0300_DMA_UART9		9
> +
> +/* I2C controllers */
> +#define LS2K0300_DMA_I2C0		10
> +#define LS2K0300_DMA_I2C1		11
> +#define LS2K0300_DMA_I2C2		12
> +#define LS2K0300_DMA_I2C3		13
> +
> +/* SPI controllers (IO mode) */
> +#define LS2K0300_DMA_SPI2		14
> +#define LS2K0300_DMA_SPI3		15
> +
> +/* I2S controller */
> +#define LS2K0300_DMA_I2S		16
> +
> +/* ADC controller */
> +#define LS2K0300_DMA_ADC		17
> +
> +/* CAN-FD controllers */
> +#define LS2K0300_DMA_CAN0		18
> +#define LS2K0300_DMA_CAN1		19
> +#define LS2K0300_DMA_CAN2		20
> +#define LS2K0300_DMA_CAN3		21
> +
> +/* Total number of 2K0300 DMA requests */
> +#define LS2K0300_DMA_REQ_MAX		22

REQ_MAX is not ABI and your driver have not use it.

Frnak

> +
> +#endif /* _DT_BINDINGS_DMA_LOONGSON_LS2K_DMAMUX_H */
> --
> 2.52.0
>