linux-kernel - Re: [PATCH 2/2] ARM: imx: src: support vf610 system reset controller

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Date:	Fri, 28 Nov 2014 22:24:31 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Stefan Agner <stefan@...er.ch>
Cc:	linux-arm-kernel@...ts.infradead.org, shawn.guo@...aro.org,
	kernel@...gutronix.de, linux@...ck-us.net,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] ARM: imx: src: support vf610 system reset controller

On Friday 28 November 2014 22:02:01 Stefan Agner wrote:
> On 2014-11-28 17:49, Arnd Bergmann wrote:
> > On Friday 28 November 2014 17:43:35 Stefan Agner wrote:
> >> Support Vybrid SoC's system reset controller (SRC). Currently we
> >> don't register a reset controller but only support the imx_cpu_jump
> >> and imx_cpu_arg functions.
> >>
> >> Signed-off-by: Stefan Agner <stefan@...er.ch>
> > 
> > I think this should be a platform driver in drivers/power/reset.
> 
> Yeah, I thought that too, see my cover letter. The problem is, in that
> module are also some register which are of interest when implementing
> suspend/resume support (see cover letter too). However, we could also
> just make a dt entry for that reset register only, and create another dt
> entry for the other registers.

Don't make a node with just one register, in this case, a syscon device
would be best.

> > If the SRC is also capable of resetting individual blocks instead of just
> > the entire machine, it would be a reset driver in drivers/reset instead.
> 
> Beside the system reset, there is only a mask functionality for the
> watchdogs (there are two watchdogs, one for Cortex-A5 and one for the
> M4). This makes the SRC module in the Vybrid a bit different then what
> is available on other i.MX SoC's...

If you already have the watchdog registers in there and want to have
a watchdog driver too, the easiest way would be to register the reboot
handler from the watchdog driver.

	Arnd
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