linux-kernel - Re: [linux-sunxi] Re: [PATCH 02/10] net: stmmac: Honor DT parameter to force DMA store and forward mode

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Date:	Tue, 10 Dec 2013 21:10:22 +0100
From:	"maxime.ripard" <maxime.ripard@...e-electrons.com>
To:	Chen-Yu Tsai <wens@...e.org>
Cc:	linux-sunxi <linux-sunxi@...glegroups.com>,
	David Miller <davem@...emloft.net>,
	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	netdev <netdev@...r.kernel.org>,
	"rob.herring" <rob.herring@...xeda.com>,
	devicetree <devicetree@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Srinivas KANDAGATLA <srinivas.kandagatla@...com>
Subject: Re: [linux-sunxi] Re: [PATCH 02/10] net: stmmac: Honor DT parameter
 to force DMA store and forward mode

On Mon, Dec 09, 2013 at 10:59:38AM +0800, Chen-Yu Tsai wrote:
> On Sat, Dec 7, 2013 at 7:06 PM, Tomasz Figa <tomasz.figa@...il.com> wrote:
> > On Saturday 07 of December 2013 11:07:37 maxime.ripard wrote:
> >> On Sat, Dec 07, 2013 at 09:23:27AM +0800, Chen-Yu Tsai wrote:
> >> > Point taken. The current implementation will override settings passed from
> >> > platform data. ORing the two would be better.
> >>
> >> Platform_data and DT-based configuration are pretty unlikely to be
> >> used together, so ORing it doesn't have much sense.
> >
> > In fact, the recommended way is to always use platform data alone if it is
> > present or try to parse DT otherwise, so no mixing of data from these two
> > sources should be done.
> 
> Would binding platform data with compatibles, as I did so in this patch
> series, be a bad idea then?

What I meant was that you'll either be probed will pdev->dev.of_node
or pdev->dev.platform_data filled, but not both at the same time, so
ORing it isn't really sensible.

But I don't see why you couldn't reuse the stmmac_platform_data
structure in your patch.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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