linux-kernel - Re: [PATCH 15/30] usb/musb: use a Kconfig choice to pick the right DMA method

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Date:	Sun, 2 Oct 2011 17:14:47 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Tony Lindgren <tony@...mide.com>, Felipe Balbi <balbi@...com>,
	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 15/30] usb/musb: use a Kconfig choice to pick the right
	DMA method

On Sun, Oct 02, 2011 at 04:45:45PM +0200, Arnd Bergmann wrote:
> The logic to allow only one DMA driver in MUSB is currently
> flawed, because it also allows picking no DMA driver at all
> and also not selecting PIO mode.
> 
> Using a choice statement makes this foolproof for now and
> also simplifies the Makefile.
> 
> Unfortunately, we will have to revisit this when we start
> supporting multiple ARM platforms in a single kernel binary,
> because at that point we will actually need to select
> multiple DMA drivers and pick the right one at run-time.

I thought there was some work going on to convert this to use the
dmaengine stuff?

But in any case, a stop-gap fix is needed for randconfig.
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