From: LW@KARO-electronics.de (Lothar Waßmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: iomux-mx51: Always define PU E for pins used as GPIO
Date: Wed, 22 May 2013 09:02:56 +0200 [thread overview]
Message-ID: <20892.28064.82907.942799@ipc1.ka-ro> (raw)
In-Reply-To: <1369203552.559574351@f389.i.mail.ru>
Hi,
Alexander Shiyan writes:
> > On Tue, May 21, 2013 at 12:27:25PM +0400, Alexander Shiyan wrote:
> > > This patch adds a PUE bit for pins which used as GPIO. This allow
> > > to use the GPIOs correctly as inputs when source is open-drain with
> > > external pullup resistor (IRQ open-drain outputs for example).
> >
> > I don't understand. If there's an external pullup why do you want to
> > turn on the internal one?
>
> It is just switch off keeper circuit.
>
If you want to switch the keeper circuit off why don't you do that by
removing PAD_CTL_PKE rather than adding PAD_CTL_PUE?
Lothar Wa?mann
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next prev parent reply other threads:[~2013-05-22 7:02 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-21 8:27 [PATCH] ARM: iomux-mx51: Always define PUE for pins used as GPIO Alexander Shiyan
2013-05-21 19:24 ` Sascha Hauer
2013-05-22 6:19 ` Alexander Shiyan
2013-05-22 7:02 ` Lothar Waßmann [this message]
2013-05-22 7:17 ` Re[3]: [PATCH] ARM: iomux-mx51: Always define PU E " Alexander Shiyan
2013-05-22 8:36 ` Lothar Waßmann
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