linux-kernel - Re: [PATCH v2 01/10] dt-bindings: serial: snps-dw-apb-uart: Switch dma-names order

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Date:   Mon, 27 Mar 2023 10:30:21 -0500
From:   Rob Herring <robh@...nel.org>
To:     Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
Cc:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-sunxi@...ts.linux.dev, Conor Dooley <conor@...nel.org>,
        linux-rockchip@...ts.infradead.org,
        Nicolas Frattaroli <frattaroli.nicolas@...il.com>,
        kernel@...labora.com, Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Samuel Holland <samuel@...lland.org>,
        linux-kernel@...r.kernel.org, Chen-Yu Tsai <wens@...e.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Rob Herring <robh+dt@...nel.org>, linux-serial@...r.kernel.org,
        Paul Walmsley <paul.walmsley@...ive.com>,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v2 01/10] dt-bindings: serial: snps-dw-apb-uart: Switch
 dma-names order


On Tue, 21 Mar 2023 23:56:15 +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 different board expects:
> 
>   rk3326-odroid-go2.dtb: serial@...30000: dma-names:0: 'rx' was expected
> 
> A quick and incomplete check shows the inconsistency is present in many
> other DTS files:
> 
> $ git grep -A10 snps,dw-apb-uart | grep dma-names | sort -u
> arch/arm64/boot/dts/rockchip/px30.dtsi-         dma-names = "tx", "rx";
> arch/arm64/boot/dts/rockchip/rk3328.dtsi-       dma-names = "tx", "rx";
> arch/arm64/boot/dts/rockchip/rk3588s.dtsi-      dma-names = "tx", "rx";
> arch/arm/boot/dts/rk3066a.dtsi-                 dma-names = "tx", "rx";
> arch/arm/boot/dts/rk3128.dtsi-                  dma-names = "tx", "rx";
> arch/arm/boot/dts/rk3288.dtsi-                  dma-names = "tx", "rx";
> arch/arm/boot/dts/rv1126.dtsi-                  dma-names = "tx", "rx";
> arch/arm/boot/dts/socfpga.dtsi-                 dma-names = "tx", "rx";
> arch/arm/boot/dts/sun6i-a31.dtsi-               dma-names = "rx", "tx";
> arch/arm/boot/dts/sun8i-a23-a33.dtsi-           dma-names = "rx", "tx";
> arch/arm/boot/dts/sun8i-v3s.dtsi-               dma-names = "rx", "tx";
> arch/arm/boot/dts/sunxi-h3-h5.dtsi-             dma-names = "rx", "tx";
> arch/riscv/boot/dts/allwinner/sunxi-d1s-t113.dtsi-  dma-names = "rx", "tx";
> 
> 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 really affected, since
> all of them are using a shared DMA channel for rx and tx:
> 
> $ git grep -A10 snps,dw-apb-uart | grep 'sun.*dmas' | sort -u
> arch/arm/boot/dts/sun6i-a31.dtsi-       dmas = <&dma 10>, <&dma 10>;
> arch/arm/boot/dts/sun6i-a31.dtsi-       dmas = <&dma 22>, <&dma 22>;
> arch/arm/boot/dts/sun6i-a31.dtsi-       dmas = <&dma 6>, <&dma 6>;
> arch/arm/boot/dts/sun6i-a31.dtsi-       dmas = <&dma 7>, <&dma 7>;
> arch/arm/boot/dts/sun6i-a31.dtsi-       dmas = <&dma 8>, <&dma 8>;
> arch/arm/boot/dts/sun6i-a31.dtsi-       dmas = <&dma 9>, <&dma 9>;
> arch/arm/boot/dts/sun8i-a23-a33.dtsi-   dmas = <&dma 10>, <&dma 10>;
> arch/arm/boot/dts/sun8i-a23-a33.dtsi-   dmas = <&dma 6>, <&dma 6>;
> arch/arm/boot/dts/sun8i-a23-a33.dtsi-   dmas = <&dma 7>, <&dma 7>;
> arch/arm/boot/dts/sun8i-a23-a33.dtsi-   dmas = <&dma 8>, <&dma 8>;
> arch/arm/boot/dts/sun8i-a23-a33.dtsi-   dmas = <&dma 9>, <&dma 9>;
> arch/arm/boot/dts/sun8i-v3s.dtsi-       dmas = <&dma 6>, <&dma 6>;
> arch/arm/boot/dts/sun8i-v3s.dtsi-       dmas = <&dma 7>, <&dma 7>;
> arch/arm/boot/dts/sun8i-v3s.dtsi-       dmas = <&dma 8>, <&dma 8>;
> arch/arm/boot/dts/sunxi-h3-h5.dtsi-     dmas = <&dma 6>, <&dma 6>;
> arch/arm/boot/dts/sunxi-h3-h5.dtsi-     dmas = <&dma 7>, <&dma 7>;
> arch/arm/boot/dts/sunxi-h3-h5.dtsi-     dmas = <&dma 8>, <&dma 8>;
> arch/arm/boot/dts/sunxi-h3-h5.dtsi-     dmas = <&dma 9>, <&dma 9>;
> arch/riscv/boot/dts/allwinner/sunxi-d1s-t113.dtsi-  dmas = <&dma 14>, <&dma 14>;
> arch/riscv/boot/dts/allwinner/sunxi-d1s-t113.dtsi-  dmas = <&dma 15>, <&dma 15>;
> arch/riscv/boot/dts/allwinner/sunxi-d1s-t113.dtsi-  dmas = <&dma 16>, <&dma 16>;
> arch/riscv/boot/dts/allwinner/sunxi-d1s-t113.dtsi-  dmas = <&dma 17>, <&dma 17>;
> arch/riscv/boot/dts/allwinner/sunxi-d1s-t113.dtsi-  dmas = <&dma 18>, <&dma 18>;
> arch/riscv/boot/dts/allwinner/sunxi-d1s-t113.dtsi-  dmas = <&dma 19>, <&dma 19>;
> 
> Switch dma-names order to tx->rx as the first step in fixing the
> inconsistency. The remaining DTS fixes will be handled by separate
> patches.
> 
> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
> ---
>  Documentation/devicetree/bindings/serial/snps-dw-apb-uart.yaml | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 

Reviewed-by: Rob Herring <robh@...nel.org>