linux-kernel - Re: [PATCH 1/2] power: reset: at91: add sama5d3 reset function

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Message-ID: <20150710170119.GA6585@groeck-UX31A>
Date:	Fri, 10 Jul 2015 10:01:19 -0700
From:	Guenter <linux@...ck-us.net>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:	Josh Wu <josh.wu@...el.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	linux-arm-kernel@...ts.infradead.org,
	Wei Yongjun <yongjun_wei@...ndmicro.com.cn>,
	Ben Dooks <ben.dooks@...ethink.co.uk>,
	linux-kernel@...r.kernel.org,
	Krzysztof Kozlowski <k.kozlowski.k@...il.com>,
	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Fabian Frederick <fabf@...net.be>, linux-pm@...r.kernel.org,
	Maxime Ripard <maxime.ripard@...e-electrons.com>
Subject: Re: [PATCH 1/2] power: reset: at91: add sama5d3 reset function

On Fri, Jul 10, 2015 at 07:56:58AM +0200, Alexandre Belloni wrote:
> Hi Guenter,
> 
> On 09/07/2015 at 20:14:38 -0700, Guenter Roeck wrote :
> > > This patch introduces a new compatible string: "atmel,sama5d3-rstc" for the
> > > reset driver of sama5d3 and later chips.
> > > As in sama5d3 or later chips, we don't have to shutdown the DDR controller
> > > before reset. Shutdown the DDR controller before reset is a workaround to
> > > avoid DDR signal driving the bus, but since sama5d3 and later chips there is
> > > no such a conflict.
> > > That means:
> > >   1. the sama5d3 reset function only need to write the rstc register and
> > > return.
> > >   2. for sama5d3, we can remove the code related with DDR controller as we
> > > don't use it at all.
> > > 
> > Sorry, I don't get it. Doesn't that mean there are two distinct logical
> > changes, which would ask for two separate patches ?
> 
> I would agree with Josh and I think that only one patch is needed. There
> is only one change, the removal of the workaround for sama5d3 and later.
> 
> As the workaround is using a table of compatibles to remap the ram
> controller and the one for sama5d3 is not used because it is not needed,
> I think it makes sense to remove it in that same patch. The logical
> change here is the removal of the workaround.
> 
Ok, makes sense.

Thanks,
Guenter
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