Re: [PATCH v2 03/10] ARM: dts: sun8i: a23/a33: Switch dma-names order for snps,dw-apb-uart nodes

From: "Jernej Škrabec" <jernej.skrabec@gmail.com>
To: 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>,
	Samuel Holland <samuel@sholland.org>,
	Heiko Stuebner <heiko@sntech.de>, Conor Dooley <conor@kernel.org>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Nicolas Frattaroli <frattaroli.nicolas@gmail.com>,
	Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Cc: 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 03/10] ARM: dts: sun8i: a23/a33: Switch dma-names order for snps,dw-apb-uart nodes
Date: Sat, 08 Apr 2023 14:12:38 +0200	[thread overview]
Message-ID: <3489160.iIbC2pHGDl@jernej-laptop> (raw)
In-Reply-To: <20230321215624.78383-4-cristian.ciocaltea@collabora.com>

Dne torek, 21. marec 2023 ob 22:56:17 CEST je Cristian Ciocaltea napisal(a):
> 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>
> ---

Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>

Best regards,
Jernej

>  arch/arm/boot/dts/sun8i-a23-a33.dtsi | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/sun8i-a23-a33.dtsi
> b/arch/arm/boot/dts/sun8i-a23-a33.dtsi index f630ab55bb6a..4aa9d88c9ea3
> 100644
> --- a/arch/arm/boot/dts/sun8i-a23-a33.dtsi
> +++ b/arch/arm/boot/dts/sun8i-a23-a33.dtsi
> @@ -490,7 +490,7 @@ uart0: serial@1c28000 {
>  			clocks = <&ccu CLK_BUS_UART0>;
>  			resets = <&ccu RST_BUS_UART0>;
>  			dmas = <&dma 6>, <&dma 6>;
> -			dma-names = "rx", "tx";
> +			dma-names = "tx", "rx";
>  			status = "disabled";
>  		};
> 
> @@ -503,7 +503,7 @@ uart1: serial@1c28400 {
>  			clocks = <&ccu CLK_BUS_UART1>;
>  			resets = <&ccu RST_BUS_UART1>;
>  			dmas = <&dma 7>, <&dma 7>;
> -			dma-names = "rx", "tx";
> +			dma-names = "tx", "rx";
>  			status = "disabled";
>  		};
> 
> @@ -516,7 +516,7 @@ uart2: serial@1c28800 {
>  			clocks = <&ccu CLK_BUS_UART2>;
>  			resets = <&ccu RST_BUS_UART2>;
>  			dmas = <&dma 8>, <&dma 8>;
> -			dma-names = "rx", "tx";
> +			dma-names = "tx", "rx";
>  			status = "disabled";
>  		};
> 
> @@ -529,7 +529,7 @@ uart3: serial@1c28c00 {
>  			clocks = <&ccu CLK_BUS_UART3>;
>  			resets = <&ccu RST_BUS_UART3>;
>  			dmas = <&dma 9>, <&dma 9>;
> -			dma-names = "rx", "tx";
> +			dma-names = "tx", "rx";
>  			status = "disabled";
>  		};
> 
> @@ -542,7 +542,7 @@ uart4: serial@1c29000 {
>  			clocks = <&ccu CLK_BUS_UART4>;
>  			resets = <&ccu RST_BUS_UART4>;
>  			dmas = <&dma 10>, <&dma 10>;
> -			dma-names = "rx", "tx";
> +			dma-names = "tx", "rx";
>  			status = "disabled";
>  		};