linux-kernel - RE: [PATCH] i2c-gpio.c: correct logic of pdata->scl_is_open

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Date:	Tue, 1 Nov 2011 09:02:08 +0100
From:	"Voss, Nikolaus" <N.Voss@...nmann.de>
To:	'Håvard Skinnemoen' <hskinnemoen@...il.com>
CC:	"'linux-arm-kernel@...ts.infradead.org'" 
	<linux-arm-kernel@...ts.infradead.org>,
	"'Linux Kernel'" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] i2c-gpio.c: correct logic of pdata->scl_is_open_drain

> It is never correct to use push-pull I/O for i2c, so the flag does not
> specify the desired behavior of the driver, it specifies what the
> hardware has been configured to do so that the driver can choose the
> cheapest way to do open-drain I/O.

Ok, seems rather logical after all.

> 
> And even if you could argue that the flag should be inverted, it has
> had the same meaning since the driver was introduced several years
> ago, so changing it now will break every single platform which
> currently uses i2c-gpio.

I completely agree.

Thanks for the explanation,
Niko

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