linux-kernel - Re: [PATCH v2 06/10] riscv: dts: allwinner: d1: Switch dma-names order for snps,dw-apb-uart nodes

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Date:   Tue, 21 Mar 2023 22:10:37 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Nicolas Frattaroli <frattaroli.nicolas@...il.com>,
        linux-serial@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-rockchip@...ts.infradead.org,
        linux-riscv@...ts.infradead.org, kernel@...labora.com
Subject: Re: [PATCH v2 06/10] riscv: dts: allwinner: d1: Switch dma-names
 order for snps,dw-apb-uart nodes

On Tue, Mar 21, 2023 at 11:56:20PM +0200, Cristian Ciocaltea wrote:
> Commit 370f696e4474 ("dt-bindings: serial: snps-dw-apb-uart: add dma &
> dma-names properties") documented dma-names property to handle Allwinner
> D1 dtbs_check warnings, but relies on the rx->tx ordering, which is the
> reverse of what a bunch of different boards expect.
> 
> The initial proposed solution was to allow a flexible dma-names order in
> the binding, due to potential ABI breakage concerns after fixing the DTS
> files. But luckily the Allwinner boards are not affected, since they are
> using a shared DMA channel for rx and tx.
> 
> Hence, the first step in fixing the inconsistency was to change
> dma-names order in the binding to tx->rx.
> 
> Do the same for the snps,dw-apb-uart nodes in the DTS file.
> 
> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>

Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>

Thanks,
Conor.

> ---
>  arch/riscv/boot/dts/allwinner/sunxi-d1s-t113.dtsi | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/riscv/boot/dts/allwinner/sunxi-d1s-t113.dtsi b/arch/riscv/boot/dts/allwinner/sunxi-d1s-t113.dtsi
> index 951810d46307..922e8e0e2c09 100644
> --- a/arch/riscv/boot/dts/allwinner/sunxi-d1s-t113.dtsi
> +++ b/arch/riscv/boot/dts/allwinner/sunxi-d1s-t113.dtsi
> @@ -211,7 +211,7 @@ uart0: serial@...0000 {
>  			clocks = <&ccu CLK_BUS_UART0>;
>  			resets = <&ccu RST_BUS_UART0>;
>  			dmas = <&dma 14>, <&dma 14>;
> -			dma-names = "rx", "tx";
> +			dma-names = "tx", "rx";
>  			status = "disabled";
>  		};
>  
> @@ -224,7 +224,7 @@ uart1: serial@...0400 {
>  			clocks = <&ccu CLK_BUS_UART1>;
>  			resets = <&ccu RST_BUS_UART1>;
>  			dmas = <&dma 15>, <&dma 15>;
> -			dma-names = "rx", "tx";
> +			dma-names = "tx", "rx";
>  			status = "disabled";
>  		};
>  
> @@ -237,7 +237,7 @@ uart2: serial@...0800 {
>  			clocks = <&ccu CLK_BUS_UART2>;
>  			resets = <&ccu RST_BUS_UART2>;
>  			dmas = <&dma 16>, <&dma 16>;
> -			dma-names = "rx", "tx";
> +			dma-names = "tx", "rx";
>  			status = "disabled";
>  		};
>  
> @@ -250,7 +250,7 @@ uart3: serial@...0c00 {
>  			clocks = <&ccu CLK_BUS_UART3>;
>  			resets = <&ccu RST_BUS_UART3>;
>  			dmas = <&dma 17>, <&dma 17>;
> -			dma-names = "rx", "tx";
> +			dma-names = "tx", "rx";
>  			status = "disabled";
>  		};
>  
> @@ -263,7 +263,7 @@ uart4: serial@...1000 {
>  			clocks = <&ccu CLK_BUS_UART4>;
>  			resets = <&ccu RST_BUS_UART4>;
>  			dmas = <&dma 18>, <&dma 18>;
> -			dma-names = "rx", "tx";
> +			dma-names = "tx", "rx";
>  			status = "disabled";
>  		};
>  
> @@ -276,7 +276,7 @@ uart5: serial@...1400 {
>  			clocks = <&ccu CLK_BUS_UART5>;
>  			resets = <&ccu RST_BUS_UART5>;
>  			dmas = <&dma 19>, <&dma 19>;
> -			dma-names = "rx", "tx";
> +			dma-names = "tx", "rx";
>  			status = "disabled";
>  		};
>  
> -- 
> 2.40.0
> 

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