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

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Message-ID: <7cd34af7-94e7-b5e2-053c-4cc831e4cfc4@collabora.com>
Date:   Wed, 22 Mar 2023 00:17:28 +0200
From:   Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
To:     Conor Dooley <conor@...nel.org>
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 3/22/23 00:09, Conor Dooley wrote:
> 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.

Thanks for the quick review! And no worries, I'm glad I could help, 
hopefully I didn't miss anything..