Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763314Ab3DCU20 (ORCPT ); Wed, 3 Apr 2013 16:28:26 -0400 Received: from mail-ia0-f182.google.com ([209.85.210.182]:39691 "EHLO mail-ia0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760535Ab3DCU2Y (ORCPT ); Wed, 3 Apr 2013 16:28:24 -0400 MIME-Version: 1.0 In-Reply-To: <515C63F3.5070401@wwwdotorg.org> References: <1364490685-21831-1-git-send-email-bbasu@nvidia.com> <5154827B.8010701@wwwdotorg.org> <515C63F3.5070401@wwwdotorg.org> Date: Wed, 3 Apr 2013 22:28:23 +0200 Message-ID: Subject: Re: [PATCH] pinctrl: tegra: add suspend-resume support From: Linus Walleij To: Stephen Warren Cc: Bibek Basu , "linux-kernel@vger.kernel.org" , Pritesh Raithatha Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1028 Lines: 24 On Wed, Apr 3, 2013 at 7:16 PM, Stephen Warren wrote: > It's possible program the registers so that the same signal is connected > to (or from depending on signal direction) multiple pins at once. If > this is done, the behaviour is unspecified; who knows which pin will > actually receive (or provide) that signal? In the dbx500 this will actually make the signal come out on both pins. So there are several muxes connected to the same internal rail. I can imagine a few odd ways that would work differently though... We could use this to connect two UARTs to the console, not very useful, but hey, dual screens... I wonder what happens if both consoles hit enter at the same instant. Probably nasty electronic states are possible. Yours, Linus Walleij -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/