linux-kernel - Re: [PATCH v2 1/3] power: reset: read priority from device tree

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Message-ID: <20141201172219.GA24692@roeck-us.net>
Date:	Mon, 1 Dec 2014 09:22:19 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Mark Rutland <mark.rutland@....com>
Cc:	Stefan Agner <stefan@...er.ch>,
	"shawn.guo@...aro.org" <shawn.guo@...aro.org>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>,
	"arnd@...db.de" <arnd@...db.de>, "sre@...nel.org" <sre@...nel.org>,
	"fkan@....com" <fkan@....com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"dbaryshkov@...il.com" <dbaryshkov@...il.com>,
	"dwmw2@...radead.org" <dwmw2@...radead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] power: reset: read priority from device tree

On Mon, Dec 01, 2014 at 05:11:26PM +0000, Mark Rutland wrote:
> On Mon, Dec 01, 2014 at 05:03:07PM +0000, Stefan Agner wrote:
> > This patch adds an optional property which allows to specify the
> > reset source priority. This priority is used by the kernel restart
> > handler call chain to sort out the proper reset/restart method.
> > Depending on the power design of a board or other machine/board
> > specific peculiarity, it is not possible to pick a generic priority.
> > 
> > Signed-off-by: Stefan Agner <stefan@...er.ch>
> > ---
> >  Documentation/devicetree/bindings/power/reset/syscon-reboot.txt | 3 +++
> >  drivers/power/reset/syscon-reboot.c                             | 5 ++++-
> >  2 files changed, 7 insertions(+), 1 deletion(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/power/reset/syscon-reboot.txt b/Documentation/devicetree/bindings/power/reset/syscon-reboot.txt
> > index 1190631..ee41d9c 100644
> > --- a/Documentation/devicetree/bindings/power/reset/syscon-reboot.txt
> > +++ b/Documentation/devicetree/bindings/power/reset/syscon-reboot.txt
> > @@ -11,6 +11,9 @@ Required properties:
> >  - offset: offset in the register map for the reboot register (in bytes)
> >  - mask: the reset value written to the reboot register (32 bit access)
> >  
> > +Optional properties:
> > +- priority: define the priority of the reset (0-255, defaults to 128)
> > +
> 
> NAK. This is a leak of Linux-internal details.
> 
> What is this necessary for?
> 
It establishes which restart handler to use if there more than one means
to reset the system. See documentation to register_restart_handler() in
kernel/reboot.c.

Guenter
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