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

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Date:   Tue, 21 Mar 2023 22:09:09 +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 01/10] dt-bindings: serial: snps-dw-apb-uart: Switch
 dma-names order

On Tue, Mar 21, 2023 at 11:56:15PM +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:

> 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:

> 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>

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

Thanks for doing all of the switch overs too. I should've probably
broadened my searching beyond the allwinner platforms when I initially
added this, so yeah, thanks.

> ---
>  Documentation/devicetree/bindings/serial/snps-dw-apb-uart.yaml | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/serial/snps-dw-apb-uart.yaml b/Documentation/devicetree/bindings/serial/snps-dw-apb-uart.yaml
> index 2becdfab4f15..d28cc96fa8e9 100644
> --- a/Documentation/devicetree/bindings/serial/snps-dw-apb-uart.yaml
> +++ b/Documentation/devicetree/bindings/serial/snps-dw-apb-uart.yaml
> @@ -72,8 +72,8 @@ properties:
>  
>    dma-names:
>      items:
> -      - const: rx
>        - const: tx
> +      - const: rx
>  
>    snps,uart-16550-compatible:
>      description: reflects the value of UART_16550_COMPATIBLE configuration
> -- 
> 2.40.0
> 

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