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

From: Conor Dooley <conor@kernel.org>
To: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Chen-Yu Tsai <wens@csie.org>,
	Jernej Skrabec <jernej.skrabec@gmail.com>,
	Samuel Holland <samuel@sholland.org>,
	Heiko Stuebner <heiko@sntech.de>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Nicolas Frattaroli <frattaroli.nicolas@gmail.com>,
	linux-serial@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-sunxi@lists.linux.dev, linux-rockchip@lists.infradead.org,
	linux-riscv@lists.infradead.org, kernel@collabora.com
Subject: Re: [PATCH v2 06/10] riscv: dts: allwinner: d1: Switch dma-names order for snps,dw-apb-uart nodes
Date: Tue, 21 Mar 2023 22:10:37 +0000	[thread overview]
Message-ID: <f8a9f9e8-d0b0-4336-8d99-8dbe4792b0ff@spud> (raw)
In-Reply-To: <20230321215624.78383-7-cristian.ciocaltea@collabora.com>

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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@collabora.com>

Reviewed-by: Conor Dooley <conor.dooley@microchip.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@2500000 {
>  			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@2500400 {
>  			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@2500800 {
>  			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@2500c00 {
>  			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@2501000 {
>  			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@2501400 {
>  			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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