linux-kernel - Re: [PATCH v2 2/3] watchdog: bcm2835: Add poweroff code for the Raspberry Pi

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Message-ID: <557F930E.8010002@wwwdotorg.org>
Date:	Mon, 15 Jun 2015 21:07:58 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Noralf Trønnes <noralf@...nnes.org>
CC:	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-watchdog@...r.kernel.org,
	linux-rpi-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] watchdog: bcm2835: Add poweroff code for the Raspberry
 Pi

On 06/13/2015 05:39 AM, Noralf Trønnes wrote:
> This adds a new poweroff function to the watchdog driver for the
> Raspberry Pi. Currently poweroff/halt results in a reboot.
> 
> The Raspberry Pi firmware uses the RSTS register to know which
> partiton to boot from. The partiton value is spread into bits
> 0, 2, 4, 6, 8, 10. Partiton 63 is a special partition used by
> the firmware to indicate halt.
> 
> The firmware made this change in 19 Aug 2013 and was matched
> by the downstream commit:
> Changes for new NOOBS multi partition booting from gsh

I don't understand why we need a new compatible value here; why not
simply modify the existing bcm2835_power_off() function. That is written
to do something that's interpreted by the RPi firmware, not something
that the bcm2835 HW does.

Admittedly the current name is a bit misleading, but fixing that should
be a separate change to fixing the implementation to do what the current
firmware expects.
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