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

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Message-ID: <20150710031438.GA27089@roeck-us.net>
Date:	Thu, 9 Jul 2015 20:14:38 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Josh Wu <josh.wu@...el.com>
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>,
	linux-arm-kernel@...ts.infradead.org,
	Wei Yongjun <yongjun_wei@...ndmicro.com.cn>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	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 09:59:53AM +0800, Josh Wu wrote:
> Hi, Guenter
> 
> On 7/10/2015 1:37 AM, Guenter Roeck wrote:
> >On Thu, Jul 09, 2015 at 06:15:46PM +0800, Josh Wu wrote:
> >>As since sama5d3, to reset the chip, we don't need to shutdown the ddr
> >>controller.
> >>
> >>So add a new compatible string and new restart function for sama5d3 and
> >>later chips. As we don't use sama5d3 ddr controller, so remove it as
> >>well.
> >>
> >That sounds like it should be two separate patches, or am I missing something ?
> 
> I think using one patch makes more sense. Maybe the commit log is not clear
> enough. How about put it this way:
> 
> 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 ?

Guenter
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