From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756849Ab1GDJiE (ORCPT ); Mon, 4 Jul 2011 05:38:04 -0400 Received: from mail.karo-electronics.de ([81.173.242.67]:52932 "EHLO mail.karo-electronics.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752606Ab1GDJiB (ORCPT ); Mon, 4 Jul 2011 05:38:01 -0400 Message-ID: <19985.35317.629981.97373@ipc1.ka-ro> Date: Mon, 4 Jul 2011 11:37:57 +0200 From: =?utf-8?Q?Lothar_Wa=C3=9Fmann?= To: Grant Likely Cc: linux-kernel@vger.kernel.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Subject: Re: [PATCH] add missing intialisation of bgc->dir In-Reply-To: <20110704064844.GM15152@ponder.secretlab.ca> References: <1309522131-2237-1-git-send-email-LW@KARO-electronics.de> <1309522131-2237-2-git-send-email-LW@KARO-electronics.de> <20110704064844.GM15152@ponder.secretlab.ca> X-Mailer: VM 8.0.9 under Emacs 22.2.1 (i486-pc-linux-gnu) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, Grant Likely writes: > On Fri, Jul 01, 2011 at 02:08:51PM +0200, Lothar Waßmann wrote: > > --- > > drivers/gpio/basic_mmio_gpio.c | 1 + > > 1 files changed, 1 insertions(+), 0 deletions(-) > > > > diff --git a/drivers/gpio/basic_mmio_gpio.c b/drivers/gpio/basic_mmio_gpio.c > > index 8152e9f..e69a453 100644 > > --- a/drivers/gpio/basic_mmio_gpio.c > > +++ b/drivers/gpio/basic_mmio_gpio.c > > @@ -399,6 +399,7 @@ int __devinit bgpio_init(struct bgpio_chip *bgc, > > return ret; > > > > bgc->data = bgc->read_reg(bgc->reg_dat); > > + bgc->dir = bgc->read_reg(bgc->reg_dir); > > Hi Lothar. > > You'll need to double check your email setup. The patch got emailed > separately from the description. > git-send-email did that. > I don't know if this is a valid thing to do or not. Not every GPIO > controller supports reading back the initial state from the direction > register. I suspect it is better to leave initialization of the > direction to the gpio controller driver itself. > That would mean, that external software would have to have access to the bgpio internal data structures which is a Bad Thing(TM) IMO. Or we need a function that allows to explicitly initialize the internal shadow registers. Lothar Waßmann -- ___________________________________________________________ Ka-Ro electronics GmbH | Pascalstraße 22 | D - 52076 Aachen Phone: +49 2408 1402-0 | Fax: +49 2408 1402-10 Geschäftsführer: Matthias Kaussen Handelsregistereintrag: Amtsgericht Aachen, HRB 4996 www.karo-electronics.de | info@karo-electronics.de ___________________________________________________________