linux-kernel - Re: [PATCH 3/6] ARM: PSCI: Register with kernel restart handler

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Message-ID: <20160414085242.GB1533@katana>
Date:	Thu, 14 Apr 2016 10:52:43 +0200
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Mark Rutland <mark.rutland@....com>,
	Russell King <linux@....linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Subject: Re: [PATCH 3/6] ARM: PSCI: Register with kernel restart handler


> That makes things quite tricky. Best I can think of is a series of boolean
> devicetree properties, such as
> 
> 	broken-reset-handler
> 	last-resort-restart-handler
> 	secondary-restart-handler
> 	default-restart-handler
> 	primary-restart-handler
> 
> which ends up being quite similar to the 'restart-priority' property. I'll
> do this as follow-up patch, though

Please CC me on this. I wanted to tackle this problem as well today. My
findings/conclusions so far:

* There is one driver bringing 'priority' directly to DT already: gpio-restart

* Watchdog priorities are board dependant

* Having the priorities clear at boot-time is safer than configuring them
  at run-time

* The linux scheme (0-255) shouldn't be enforced in DT

So, I wondered about a "priority" binding which just states "the higher,
the more important". Then any OS can decide what to do with it. In the
Linux case, this could be: sort them and give them priority 256 -
position_in_sorted_list.

Opinions?

> - I do not see the point holding up the series for this, and it is
> really a separate problem.

Ack.


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