From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Lunn Subject: Re: [PATCH v2 01/12] ARM: Orion: DT support for IRQ and GPIO Controllers Date: Thu, 5 Jul 2012 13:48:15 +0200 Message-ID: <20120705114815.GT17534@lunn.ch> References: <1341325365-21393-1-git-send-email-andrew@lunn.ch> <1341325365-21393-2-git-send-email-andrew@lunn.ch> <20120705110251.596331e0@skate> <20120705094824.GO17534@lunn.ch> <87sjd6ikkj.fsf@lebrac.rtp-net.org> <20120705122050.2fbc2fe3@skate> <87liiyijb8.fsf@lebrac.rtp-net.org> <20120705134231.3e1801e5@skate> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20120705134231.3e1801e5@skate> Sender: linux-i2c-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Thomas Petazzoni Cc: Arnaud Patard , Andrew Lunn , Jason Cooper , devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org, rob.herring-bsGFqQB8/DxBDgjK7y7TUQ@public.gmane.org, grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org, Michael Walle , linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, Lior Amsalem , Maen Suleiman List-Id: devicetree@vger.kernel.org Hi Thomas > Yes. I am not sure yet how to describe those in the DT, or even if it > is actually useful to describe them. Wouldn't it be simpler to just > leave to the user of the GPIO to use a GPIO that's appropriate for its > usage, i.e not use a GPO when input is needed? We assume the hardware designer has got the basic hardware right. Its not going to work otherwise. What we are trying to detect is a DT author making a typo, assigning a gpio-key to a GPO pin, for example. The current MPP scheme will detect this sort of error and issue a warning to the kernel logs. Andrew