linux-kernel - Re: [PATCH 0/8] dmaengine: Add new API to combine onfiguration and descriptor preparation

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Message-ID: <aUI7RJvQUx3m2IRf@vaman>
Date: Wed, 17 Dec 2025 10:40:28 +0530
From: Vinod Koul <vkoul@...nel.org>
To: Frank Li <Frank.li@....com>
Cc: Manivannan Sadhasivam <mani@...nel.org>,
	Krzysztof Wilczyński <kwilczynski@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>, Christoph Hellwig <hch@....de>,
	Sagi Grimberg <sagi@...mberg.me>,
	Chaitanya Kulkarni <kch@...dia.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	Nicolas Ferre <nicolas.ferre@...rochip.com>,
	Alexandre Belloni <alexandre.belloni@...tlin.com>,
	Claudiu Beznea <claudiu.beznea@...on.dev>,
	Koichiro Den <den@...inux.co.jp>, Niklas Cassel <cassel@...nel.org>,
	dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-nvme@...ts.infradead.org,
	mhi@...ts.linux.dev, linux-arm-msm@...r.kernel.org,
	linux-crypto@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	imx@...ts.linux.dev
Subject: Re: [PATCH 0/8] dmaengine: Add new API to combine onfiguration and
 descriptor preparation

On 16-12-25, 12:28, Frank Li wrote:
> On Tue, Dec 16, 2025 at 10:47:57PM +0530, Vinod Koul wrote:
> > On 16-12-25, 10:55, Frank Li wrote:
> > > The usual prep_ call have not sconf argument, which need depend on previous
> > > config.
> > >
> > > further, If passdown NULL for config, it means use previuos config.
> >
> > I know it is bit longer but somehow I would feel better for the API to
> > imply config as well please
> 
> I can use you suggested dmaengine_prep_config_perip_single().
> 
> But how about use dmaengine_prep_config_single(), which little bit shorter
> and use "config" to imply it is for periperal? (similar to cyclic case?)

Yes that is a good idea. config does imply peripheral cases. Please make
sure API documentation marks that clearly

BR
-- 
~Vinod