linux-kernel - Re: [v2,3/3] i2c: at91: added slave mode support

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Message-ID: <20180709151504.6phtp4rm7of6b2qc@M43218.corp.atmel.com>
Date:   Mon, 9 Jul 2018 17:15:04 +0200
From:   Ludovic Desroches <ludovic.desroches@...rochip.com>
To:     Wolfram Sang <wsa@...-dreams.de>
CC:     Juergen Fitschen <me@....yt>, <linux-i2c@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [v2,3/3] i2c: at91: added slave mode support

Sorry for the delay to answer. I changed my email filters. Unfortunately
there was a bug and I missed message from this mailing list...

On Sat, Jun 02, 2018 at 11:35:13PM +0200, Wolfram Sang wrote:
> On Thu, Nov 09, 2017 at 06:22:29PM +0100, Juergen Fitschen wrote:
> > Slave mode driver is based on the concept of i2c-designware driver.
> > 
> > Signed-off-by: Juergen Fitschen <me@....yt>
> 
> I lost the original mail where Ludovic said:
> 
> "I tested it quickly on a sama5d2 xplained board: I used an i2c-gpio
> master and the eeprom driver. It works pretty well. I tried to increase
> the size of the eeprom by adding:
> + { "slave-24c64", 65536 / 8 },"
> 
> That won't work. The comment at the beginning of the file says:
> 
>  * ... It is prepared to simulate bigger EEPROMs with an internal 16 bit
>  * pointer, yet implementation is deferred until the need actually arises.
> 
> So,  no EEPROMs > 256 byte for now.

Sorry for having not catched it. If I remember well, it was the only
issue I had while testing the slave support.

> 
> BTW maybe I asked already and forgot: is this IP core capable of being
> master and slave on the same bus?
> 

No the master and slave modes are exclusive.

Regards

Ludovic