Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754824Ab3JCSBf (ORCPT ); Thu, 3 Oct 2013 14:01:35 -0400 Received: from mail-qa0-f46.google.com ([209.85.216.46]:59686 "EHLO mail-qa0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754789Ab3JCSBd (ORCPT ); Thu, 3 Oct 2013 14:01:33 -0400 MIME-Version: 1.0 X-Originating-IP: [2620:0:1000:1b02:6e3b:e5ff:fe16:f1aa] In-Reply-To: References: <1380670860-17621-1-git-send-email-seanpaul@chromium.org> <1380670860-17621-4-git-send-email-seanpaul@chromium.org> Date: Thu, 3 Oct 2013 11:01:30 -0700 Message-ID: Subject: Re: [PATCH 3/5] drm/bridge: Add PTN3460 bridge driver From: Olof Johansson To: Inki Dae Cc: Sean Paul , "devicetree@vger.kernel.org" , "linux-samsung-soc@vger.kernel.org" , "linux-doc@vger.kernel.org" , "linux-kernel@vger.kernel.org" , DRI mailing list , "linux-arm-kernel@lists.infradead.org" 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: 1165 Lines: 31 On Thu, Oct 3, 2013 at 10:39 AM, Inki Dae wrote: > 2013/10/3 Sean Paul : >> On Thu, Oct 3, 2013 at 9:55 AM, Inki Dae wrote: >>> Can a regulator be used instead of gpio in other board case? >>> >> >> No, not to my knowledge. >> > > Hm.. plz check it out again. the gpio pin is specific to board, and > the the gpio be used as power source trigger could be replaced with a > regulator according to board design. So you should consider all > possibilities even though there are no other cases yet: other board > could use a regulator instead. Take a look at the data sheet, it is publicly available. PD_N is not a power supply input, so modelling it as a regulator makes no sense: "If PD_N is LOW, then the device is in Deep power-down completely, even if supply rail is ON; for the device to be able to operate, the PD_N pin must be HIGH." -Olof -- 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/