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

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Message-ID: <CAF8ieYXPMgUzekth7PGxC3AgYNKac-HQ21D3vvB5J3SLOatmfQ@mail.gmail.com>
Date:	Mon, 31 Oct 2011 14:21:56 -0700
From:	Håvard Skinnemoen <hskinnemoen@...il.com>
To:	"Voss, Nikolaus" <N.Voss@...nmann.de>
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

On Mon, Oct 31, 2011 at 9:14 AM, Voss, Nikolaus <N.Voss@...nmann.de> wrote:
> If pdata->scl_is_open_drain was set, the driver used push-pull output
> for SCL, not open-drain output.
>
> Signed-off-by: Nikolaus Voss <n.voss@...nmann.de>

{sda,scl}_is_open_drain indicates that the GPIO hardware is set up to
do open drain so the software doesn't have to, i.e.
gpio_set_value(pin, 1) will turn off the output driver rather than
drive the pin high, so the _val functions will do the right thing.

In other words, the existing code is correct.

Havard
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