Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754720Ab1BUJTY (ORCPT ); Mon, 21 Feb 2011 04:19:24 -0500 Received: from metis.ext.pengutronix.de ([92.198.50.35]:58425 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753026Ab1BUJTX (ORCPT ); Mon, 21 Feb 2011 04:19:23 -0500 Date: Mon, 21 Feb 2011 10:19:16 +0100 From: Wolfram Sang To: Alexander Stein Cc: Lars-Peter Clausen , Eric Miao , Peter Tyser , linux-kernel@vger.kernel.org, Alek Du , Samuel Ortiz , David Brownell , Uwe Kleine-K?nig , Mark Brown , Joe Perches , Alan Cox , Grant Likely Subject: Re: [PATCH v2 1/4] gpiolib: Add "unknown" direction support Message-ID: <20110221091916.GA2616@pengutronix.de> References: <1297904216-15219-1-git-send-email-ptyser@xes-inc.com> <201102171321.47704.alexander.stein@systec-electronic.com> <4D5D1D3E.2020107@metafoo.de> <201102211009.31381.alexander.stein@systec-electronic.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="W/nzBZO5zC0uMSeA" Content-Disposition: inline In-Reply-To: <201102211009.31381.alexander.stein@systec-electronic.com> User-Agent: Mutt/1.5.20 (2009-06-14) X-SA-Exim-Connect-IP: 2001:6f8:1178:2:221:70ff:fe71:1890 X-SA-Exim-Mail-From: w.sang@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-kernel@vger.kernel.org Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1467 Lines: 47 --W/nzBZO5zC0uMSeA Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable > > Sharing GPIOs in read-only mode, is indeed something that is not covere= d by > > the GPIO API. It might be worth adding a gpio_request_shared, which wou= ld > > only permit setting the direction to input. Futher gpio_request_shared > > calls would be allowed but gpio_request calls would fail. >=20 > gpio_request_shared sounds interesting, but in this case an implicit=20 Can you name a use-case? One reason is that we won't need to implement it if there is no user, another one is that it could potentially weaken abstractions? Regards, Wolfram --=20 Pengutronix e.K. | Wolfram Sang | Industrial Linux Solutions | http://www.pengutronix.de/ | --W/nzBZO5zC0uMSeA Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) iEYEARECAAYFAk1iLhQACgkQD27XaX1/VRvpBACfbBfCnrvb/M0aZPpd/7di/yux Xd8An1RDu0EuBZSbn1/XH/b+rnNkAdPn =Jwgo -----END PGP SIGNATURE----- --W/nzBZO5zC0uMSeA-- -- 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/