linux-kernel - Re: [PATCH v3 3/6] spi: spi-fsl-dspi: Stub out DMA functions

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Message-Id: <290fc244-e88f-47a3-8dd3-0ec27eb5c60b@app.fastmail.com>
Date: Tue, 24 Jun 2025 19:16:04 +0200
From: "Arnd Bergmann" <arnd@...db.de>
To: "Frank Li" <Frank.li@....com>, "James Clark" <james.clark@...aro.org>
Cc: "Vladimir Oltean" <olteanv@...il.com>, "Mark Brown" <broonie@...nel.org>,
 "Vladimir Oltean" <vladimir.oltean@....com>,
 "Larisa Grigore" <larisa.grigore@....com>, "Christoph Hellwig" <hch@....de>,
 linux-spi@...r.kernel.org, imx@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/6] spi: spi-fsl-dspi: Stub out DMA functions

On Tue, Jun 24, 2025, at 18:29, Frank Li wrote:
> On Tue, Jun 24, 2025 at 11:35:33AM +0100, James Clark wrote:
>> This will allow the build to succeed with !CONFIG_HAS_DMA, either due to
>> a randconfig build test or when the target only uses one of the non-DMA
>
> I supposed you met kbuild error. If yes, can you add kbuild build report
> tags.

Actually I would suggest making it a dependency on CONFIG_DMA_ENGINE
instead of CONFIG_HAS_DMA, since that is the more relevant symbol.

It would also be simpler to enforce this in Kconfig if we only
care about users that use the DMA support. 

      Arnd