linux-kernel - Re: [Patch v4 06/10] dmaengine: Add dma router for pl08x in LPC32XX SoC

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Date: Mon, 24 Jun 2024 10:59:11 +0200
From: Piotr Wojtaszczyk <piotr.wojtaszczyk@...esys.com>
To: Vinod Koul <vkoul@...nel.org>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, "J.M.B. Downing" <jonathan.downing@...tel.com>, 
	Vladimir Zapolskiy <vz@...ia.com>, Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, 
	Russell King <linux@...linux.org.uk>, Michael Turquette <mturquette@...libre.com>, 
	Stephen Boyd <sboyd@...nel.org>, Andi Shyti <andi.shyti@...nel.org>, 
	Miquel Raynal <miquel.raynal@...tlin.com>, Richard Weinberger <richard@....at>, 
	Vignesh Raghavendra <vigneshr@...com>, Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>, 
	Yangtao Li <frank.li@...o.com>, Arnd Bergmann <arnd@...db.de>, Li Zetao <lizetao1@...wei.com>, 
	Chancel Liu <chancel.liu@....com>, Michael Ellerman <mpe@...erman.id.au>, dmaengine@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, alsa-devel@...a-project.org, 
	linuxppc-dev@...ts.ozlabs.org, linux-sound@...r.kernel.org, 
	linux-clk@...r.kernel.org, linux-i2c@...r.kernel.org, 
	linux-mtd@...ts.infradead.org, Markus Elfring <Markus.Elfring@....de>
Subject: Re: [Patch v4 06/10] dmaengine: Add dma router for pl08x in LPC32XX SoC

On Mon, Jun 24, 2024 at 7:39 AM Vinod Koul <vkoul@...nel.org> wrote:
> Any reason why dmaengine parts cant be sent separately, why are they
> clubbed together, I dont see any obvious dependencies...

The I2S driver depends on the dmaengine parts

> On 20-06-24, 19:56, Piotr Wojtaszczyk wrote:
> > LPC32XX connects few of its peripherals to pl08x DMA thru a multiplexer,
> > this driver allows to route a signal request line thru the multiplexer for
> > given peripheral.
>
> What is the difference b/w this and lpc18xx driver, why not reuse that
> one?

The lpc18xx used the same dma peripheral (pl08x) but the request signal
multiplexer around pl08x is completely different - there are no common parts.

-- 
Piotr Wojtaszczyk
Timesys