linux-kernel - Re: [PATCH v3 00/12] pwm: add support for atomic update

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Message-ID: <20160222212438.GG18327@sirena.org.uk>
Date:	Tue, 23 Feb 2016 06:24:38 +0900
From:	Mark Brown <broonie@...nel.org>
To:	Doug Anderson <dianders@...gle.com>
Cc:	Thierry Reding <thierry.reding@...il.com>,
	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Heiko Stübner <heiko@...ech.de>,
	linux-pwm <linux-pwm@...r.kernel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jingoo Han <jingoohan1@...il.com>,
	Lee Jones <lee.jones@...aro.org>, linux-fbdev@...r.kernel.org,
	Bryan Wu <cooloney@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Jacek Anaszewski <j.anaszewski@...sung.com>,
	linux-leds@...r.kernel.org,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	linux-sunxi@...glegroups.com,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Daniel Mack <daniel@...que.org>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	Robert Jarzmik <robert.jarzmik@...e.fr>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>, Olof Johansson <olof@...om.net>
Subject: Re: [PATCH v3 00/12] pwm: add support for atomic update

On Mon, Feb 22, 2016 at 11:15:09AM -0800, Doug Anderson wrote:

> Note that historically I remember that Linus Torvalds has stated that
> there is no stable API within the Linux kernel and that forcing the
> in-kernel API to never change was bad for software development.  I
> tracked down my memory and found
> <http://lwn.net/1999/0211/a/lt-binary.html>.  Linus is rabid about not
> breaking userspace, but in general there's no strong requirement to
> never change the driver API inside the kernel.  That being said,
> changing the driver API causes a lot of churn, so presumably changing
> it in a backward compatible way (like adding to the API instead of
> changing it) will make things happier.

You do need to fix the users though, change is fine but you can't cause
people's systems to break.

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