linux-kernel - Re: [PATCH] dma: sun4i: expose block size and wait cycle configuration to DMA users

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Message-ID: <20160316032213.GP13211@localhost>
Date:	Wed, 16 Mar 2016 08:52:13 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Dan Williams <dan.j.williams@...el.com>,
	dmaengine@...r.kernel.org, Chen-Yu Tsai <wens@...e.org>,
	linux-sunxi@...glegroups.com,
	Emilio López <emilio@...pez.com.ar>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dma: sun4i: expose block size and wait cycle
 configuration to DMA users

On Mon, Mar 14, 2016 at 12:46:41PM +0100, Maxime Ripard wrote:
> On Fri, Mar 11, 2016 at 04:48:26PM +0530, Vinod Koul wrote:
> > > > But this nees to be property for clients and not driver. Client can then
> > > > program these
> > > 
> > > Yes, totally. The question here is how the clients give that
> > > information to the driver.
> > 
> > For this part am not worried. If we can generalize this then we add to
> > dma_slave_config. Otherwise an exported symbol from driver should be fine.
> 
> It's actually what we would like to avoid.
> 
> We have two potential provider driver that would need such an
> interface, and we have customer drivers that would be able to use any
> of these two, depending on which SoCs we're talking about.
> 
> Maintaining some logic in each and every driver in that case to know
> which one of this symbol is to be called seems counterproductive and
> painful.

You didn't specify which one you want to avoid, and my guess is latter
choice and not former :)

As I said, if it's something we can use in few examples and describe
generically I do not mind adding to dma_slave_config

-- 
~Vinod

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