linux-kernel - Re: Question about cleaning up the LP5521/5523 LED driver

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Message-ID: <CACRpkdYQ8X7iwvHoecwYs1TZG_yP281FR-ZN7JCO=HUVp-05Ew@mail.gmail.com>
Date:	Mon, 17 Sep 2012 15:44:00 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	"Kim, Milo" <Milo.Kim@...com>
Cc:	Bryan Wu <bryan.wu@...onical.com>,
	"linux-leds@...r.kernel.org" <linux-leds@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Question about cleaning up the LP5521/5523 LED driver

On Mon, Sep 17, 2012 at 1:28 PM, Kim, Milo <Milo.Kim@...com> wrote:

> Should I keep the sysfs layout of LP5521 and LP5523?
> When we change the device attributes, do we have to consider the backward compatibility?

The ABI is a contract so basically yes, you need real good reasons
(like security concerns) to change the ABI.

That said, the lm3533 is the only LED driver that has actually documented
its ABI: Documentation/ABI/testing/sysfs-class-led-driver-lm3533

Yours,
Linus Walleij
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