linux-kernel - Re: Nokia N900 sound driver and ECI GPIOs

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Date:   Mon, 2 Jan 2017 21:01:01 +0100
From:   Pali Rohár <pali.rohar@...il.com>
To:     Aaro Koskinen <aaro.koskinen@....fi>
Cc:     Peter Ujfalusi <peter.ujfalusi@...com>,
        Jarkko Nikula <jarkko.nikula@...mer.com>,
        Tony Lindgren <tony@...mide.com>,
        Eduardo Valentin <edubezval@...il.com>,
        "Lars-Peter Clausen" <lars@...afoo.de>, Nishanth Menon <nm@...com>,
        Sebastian Reichel <sre@...nel.org>,
        Pavel Machek <pavel@....cz>,
        Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
        joerg Reisenweber <joerg@...nmoko.org>,
        linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Nokia N900 sound driver and ECI GPIOs

On Monday 02 January 2017 19:49:45 Aaro Koskinen wrote:
> Hi,
> 
> On Mon, Jan 02, 2017 at 09:44:32AM +0100, Pali Rohár wrote:
> > On Monday 02 January 2017 10:23:23 Peter Ujfalusi wrote:
> > > GPIO_182 is to select where to route the MIC line from the jack
> > > for the ECI core to handle (when the TVOUT is disabled).
> > 
> > Yes, already figured out from schematic.
> > 
> > > I have no idea what the
> > > gpio_178 should have been used for. It might be only needed for
> > > early protos but not in production devices?
> > 
> > I do not know, reason why I'm asking.
> 
> The schematic shows ECI(5:0), but only 3 are connected/used. There
> were 3 other GPIOs reserved but not used in the final product.

Are you sure that this is truth (maybe you have some information)? Or 
you just looked at schematic and deduced this observation (as other 
people too)?

Joerg already told us that RX51 schematic does not 100% match production 
N900 and e.g. there is missing UART3 pins...

What we know that gpio 178 is *already* controlled and changed by 
production Nokia kernel running on production N900 devices (as I wrote 
in first email).

-- 
Pali Rohár
pali.rohar@...il.com

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