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

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Message-ID: <20130919124457.GB26101@radagast>
Date:	Thu, 19 Sep 2013 07:44:57 -0500
From:	Felipe Balbi <balbi@...com>
To:	George Cherian <george.cherian@...com>
CC:	<balbi@...com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	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 Thu, Sep 19, 2013 at 01:43:41PM +0530, George Cherian wrote:
> On 9/18/2013 11:06 PM, Felipe Balbi wrote:
> >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 ;-)
> Is it on dra7x-evm if so which pcf device (i2c address)?

0x21 IIRC, it's pin 15 on that goes to a discrete mux. I want to toggle
the mux ;-)

-- 
balbi

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