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

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 01/10] dt-bindings: serial: snps-dw-apb-uart: Switch dma-names order
Date: Tue, 21 Mar 2023 22:09:09 +0000	[thread overview]
Message-ID: <5287504e-c0f7-4964-8a61-fd49b7ee9547@spud> (raw)
In-Reply-To: <20230321215624.78383-2-cristian.ciocaltea@collabora.com>

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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@ff030000: 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@collabora.com>

Reviewed-by: Conor Dooley <conor.dooley@microchip.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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