linux-kernel - Re: PCF857x and 16-bit GPIO expanders

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Message-ID: <20130918173636.GT21559@radagast>
Date:	Wed, 18 Sep 2013 12:36:36 -0500
From:	Felipe Balbi <balbi@...com>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
CC:	Linus Walleij <linus.walleij@...aro.org>,
	Felipe Balbi <balbi@...com>,
	George Cherian <george.cherian@...com>,
	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>
Subject: Re: PCF857x and 16-bit GPIO expanders

Hi,

On Wed, Sep 18, 2013 at 07:18:04PM +0200, Laurent Pinchart wrote:
> On Wednesday 18 September 2013 13:16:27 Linus Walleij wrote:
> > On Tue, Sep 17, 2013 at 9:07 PM, Felipe Balbi <balbi@...com> wrote:
> > > has anyone ever successfully using gpio-pcf857x.c driver with 16-bit
> > > gpio expanders ? We're having some issues here where toggling the last
> > > gpio pin (gpio 15) on a PCF8575 device causes platform to hang and I
> > > can't come up with any explanation of why would it hang...
> > 
> > Bouncing the question to George, Laurent and Kuninori...
> 
> I've got a board with a PCF8575 chip, but it uses I/Os 8 to 14 only as far as 
> I know.
> 
> I can try toggling I/O 15, but that will need to wait until next week as I'm 
> currently travelling without access to the hardware.

alright, that'd help me a lot :-) Just want to make sure if we're having
a board issue, or PCF8575 is a bit screwy ;-)

Thanks

-- 
balbi

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