Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754134AbXK0BrJ (ORCPT ); Mon, 26 Nov 2007 20:47:09 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752252AbXK0Bq6 (ORCPT ); Mon, 26 Nov 2007 20:46:58 -0500 Received: from smtp124.sbc.mail.sp1.yahoo.com ([69.147.64.97]:26304 "HELO smtp124.sbc.mail.sp1.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1752193AbXK0Bq5 (ORCPT ); Mon, 26 Nov 2007 20:46:57 -0500 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=pacbell.net; h=Received:X-YMail-OSG:From:To:Subject:Date:User-Agent:Cc:References:In-Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding:Content-Disposition:Message-Id; b=tVN//5lAGtyaJ6MvnaSSjByw9v5jPMJKV97x7HN9T6ELzrU76+A9rT2bQkmpXM7iJSqVBXmT0yO5Du5kbqM2dopWAcp7wk9+EyQIba4hJ5SZSRbyGBeLxF00XxFHkasrrYhm0z1iy7aqdtewNY99s9QzgkEPvExOibcA/nB/P34= ; X-YMail-OSG: tflseegVM1mW7OJtTtyqatWM_3pV4KCs2wYMNOTbAdVYDTQezLqt42UM6FnQIbsFOwbjgQXR_A-- From: David Brownell To: "eric miao" Subject: Re: [patch/rfc 1/4] GPIO implementation framework Date: Mon, 26 Nov 2007 17:46:54 -0800 User-Agent: KMail/1.9.6 Cc: "Linux Kernel list" , "Felipe Balbi" , "Bill Gatliff" , "Haavard Skinnemoen" , "Andrew Victor" , "Tony Lindgren" , "Jean Delvare" , "Kevin Hilman" , "Paul Mundt" , "Ben Dooks" References: <200710291809.29936.david-b@pacbell.net> <200711132308.48779.david-b@pacbell.net> In-Reply-To: <200711132308.48779.david-b@pacbell.net> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 8bit Content-Disposition: inline Message-Id: <200711261746.55235.david-b@pacbell.net> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1746 Lines: 46 On Tuesday 13 November 2007, David Brownell wrote: > So the point of these is to make it easier for platforms > (or even just boards) to make sure the GPIO number space > is densely packed, rather than loosely so? ?Paying about > 2KBytes for that privilege. ?(Assuming a 32 bit system > with 256 GPIOs.) > > I could see that being a reasonable tradeoff. ?I wouldn't > have started there myself, but you know how that goes! > > Does anyone else have any comments on that issue? Nobody else seems to have any comments on Eric's series of patches to add a gpio_desc layer ... whereas, I was looking at updating one platform, and got annoyed at some stuff that would have been non-issues with them in place! Eric, would you feel like rolling an all-in-one patch against the gpiolib support from 2.6.24-rc3-mm? Including updated versions of your patches: - [PATCH 2/5] define gpio_chip.requested_str (renaming it as "label" to match its usage) - [PATCH 3/5] use a per GPIO "struct gpio_desc" (but without that needless list; for debug, just scan the gpio_desc list for the next non-null chip) - [PATCH] move per GPIO "is_out" to "struct gpio_desc" (i.e. patch 4/5) - [PATCH 5/5] move per GPIO "requested" to "struct gpio_desc" (and "label" too) along with removing the ARCH_GPIOS_PER_CHIP symbol, and reducing ARCH_NR_GPIOS to a value which will waste less space by default? (Like maybe 256.) I think an all-in-one patch will be easier to review and agree on including (or not). - Dave - 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/