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

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Message-ID: <a109cf80-24cc-dc72-d0ab-265034c0bd4f@ti.com>
Date:   Mon, 2 Jan 2017 14:53:44 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     Pali Rohár <pali.rohar@...il.com>
CC:     Pavel Machek <pavel@....cz>,
        Jarkko Nikula <jarkko.nikula@...mer.com>,
        Tony Lindgren <tony@...mide.com>,
        Eduardo Valentin <edubezval@...il.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Aaro Koskinen <aaro.koskinen@....fi>,
        Nishanth Menon <nm@...com>, Sebastian Reichel <sre@...nel.org>,
        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 01/02/2017 10:51 AM, Pali Rohár wrote:
> On Monday 02 January 2017 10:34:34 Peter Ujfalusi wrote:
>> On 01/02/2017 12:36 AM, Pavel Machek wrote:
>>> Are there multi-button headsets compatible with N900?
>>
>> Not sure if n900 is capable of handling ECI communication, n9 was. In n9
>> the PMIC/Audio chip had an ECI core integrated afaik
> 
> In N9 it is handled by twl5030 chip? Is there documentation for that
> ECI/ACI part? N900 has twl4030 so we need some chip documentation for
> adding support for N900...

n9 has twl5031 and the documentation is not public. But the kernel
source from Nokia have the driver under drivers/mfd/twl5031-aci.c It is
using the ECI stack to report the changes.
twl4030 and twl5030 does not have support for ECI, only twl5031.


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