linux-kernel - Re: [PATCH 3/5] ARM: at91/dt: sama5d3: define mpddr clock and ramc clocks

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Message-ID: <20140708075105.GI13423@lukather>
Date:	Tue, 8 Jul 2014 09:51:06 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 3/5] ARM: at91/dt: sama5d3: define mpddr clock and ramc
 clocks

Hi,

On Mon, Jul 07, 2014 at 09:55:56PM +0200, Alexandre Belloni wrote:
> On 07/07/2014 at 20:32:36 +0200, Jean-Christophe PLAGNIOL-VILLARD wrote :
> > > -				compatible = "atmel,at91sam9g45-ddramc";
> > > +				compatible = "atmel,sama5d3-mpddramc", "atmel,at91sam9g45-ddramc";
> > the sama5 ddr controler is not back compitble with 9g45 one the compatible is
> > wrong
> 
> Keeping atmel,at91sam9g45-ddramc allows to reuse the old code for the
> iomap needed for the PM code without adding a new compatible in the
> ramc_ids[] array.

That looks like a pretty bad argument :)

If the two devices are not alike, they should have a different
compatible, it's as simple as that, and Linux should just deal with
it.

Maxime

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

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