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Date:   Thu, 20 Jan 2022 10:51:57 -0800 (PST)
Subject:     Re: [PATCH v4 1/3] riscv: dts: Add dma-channels property in dma node
In-Reply-To: <163a2cf11b2aceee2a1b8dc83251576d2371d4a6.1642383007.git.zong.li@sifive.com>
CC:     robh+dt@kernel.org, Paul Walmsley <paul.walmsley@sifive.com>,
        aou@eecs.berkeley.edu, krzysztof.kozlowski@canonical.com,
        conor.dooley@microchip.com, geert@linux-m68k.org,
        bin.meng@windriver.com, green.wan@sifive.com, vkoul@kernel.org,
        dmaengine@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
        zong.li@sifive.com
From:   Palmer Dabbelt <palmer@dabbelt.com>
To:     zong.li@sifive.com
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On Sun, 16 Jan 2022 17:35:26 PST (-0800), zong.li@sifive.com wrote:
> Add dma-channels property, then we can determine how many channels there
> by device tree.
>
> Signed-off-by: Zong Li <zong.li@sifive.com>
> ---
>  arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi | 1 +
>  arch/riscv/boot/dts/sifive/fu540-c000.dtsi        | 1 +
>  2 files changed, 2 insertions(+)
>
> diff --git a/arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi b/arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi
> index c9f6d205d2ba..3c48f2d7a4a4 100644
> --- a/arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi
> +++ b/arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi
> @@ -188,6 +188,7 @@ dma@3000000 {
>  			reg = <0x0 0x3000000 0x0 0x8000>;
>  			interrupt-parent = <&plic>;
>  			interrupts = <23 24 25 26 27 28 29 30>;
> +			dma-channels = <4>;
>  			#dma-cells = <1>;
>  		};
>
> diff --git a/arch/riscv/boot/dts/sifive/fu540-c000.dtsi b/arch/riscv/boot/dts/sifive/fu540-c000.dtsi
> index 0655b5c4201d..2bdfe7f06e4b 100644
> --- a/arch/riscv/boot/dts/sifive/fu540-c000.dtsi
> +++ b/arch/riscv/boot/dts/sifive/fu540-c000.dtsi
> @@ -171,6 +171,7 @@ dma: dma@3000000 {
>  			reg = <0x0 0x3000000 0x0 0x8000>;
>  			interrupt-parent = <&plic0>;
>  			interrupts = <23 24 25 26 27 28 29 30>;
> +			dma-channels = <4>;
>  			#dma-cells = <1>;
>  		};
>  		uart1: serial@10011000 {

I've got some comments in on the bindings, but I'm assuming it's easier 
to keep these all together.  Happy to take this through the RISC-V tree, 
but I'm guessing it'll be easier to take these via dmaengine as there's 
a lot more diff there so

Reviewed-by: Palmer Dabbelt <palmer@rivosinc.com>
Acked-by: Palmer Dabbelt <palmer@rivosinc.com>

Thanks!