From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?UTF-8?B?Tm9yYWxmIFRyw7hubmVz?= Subject: Re: [PATCH v2 2/3] watchdog: bcm2835: Add poweroff code for the Raspberry Pi Date: Tue, 16 Jun 2015 11:39:26 +0200 Message-ID: <557FEECE.9060909@tronnes.org> References: <1434195541-28368-1-git-send-email-noralf@tronnes.org> <1434195541-28368-2-git-send-email-noralf@tronnes.org> <557F930E.8010002@wwwdotorg.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <557F930E.8010002-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Stephen Warren Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-watchdog-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-rpi-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: devicetree@vger.kernel.org Den 16.06.2015 05:07, skrev Stephen Warren: > On 06/13/2015 05:39 AM, Noralf Tr=C3=B8nnes 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 writ= ten > 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 shou= ld > be a separate change to fixing the implementation to do what the curr= ent > firmware expects. There are other boards that use the BCM2835 and I didn't want to break = the behaviour for those that use the reference firmware. Roku 2 device uses this soc, and changing bcm2835_power_off() would break support for it. ODROID-W also use BCM2835, but this is a Pi clone so I don't know if th= ey have matched their firmware behaviour to that of the Pi (admittedly not many boards were made, their source of chips went dry). -- To unsubscribe from this list: send the line "unsubscribe devicetree" i= n the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html