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

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Message-ID: <20170102184945.m6maflaoihumd7nt@raspberrypi-2.musicnaut.iki.fi>
Date:   Mon, 2 Jan 2017 20:49:45 +0200
From:   Aaro Koskinen <aaro.koskinen@....fi>
To:     Pali Rohár <pali.rohar@...il.com>
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

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.

A.