linux-kernel - Re: [PATCH 10/14] net: dsa/mv88e6352: Implement EEPROM accessfunctions

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Message-ID: <54494F2A.10509@gmail.com>
Date:	Thu, 23 Oct 2014 11:55:38 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Chris Healy <chealy@...co-us.com>,
	Guenter Roeck <linux@...ck-us.net>,
	Andrew Lunn <andrew@...n.ch>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 10/14] net: dsa/mv88e6352: Implement EEPROM accessfunctions

On 10/23/2014 11:41 AM, Chris Healy wrote:
> Hi Guenter,
> 
> I do not believe it is possible to know if an EEPROM is attached or not.

If we cannot do this, how about a DT/platform data set of properties
that describes the EEPROM when present?

> 
> Chris
> ________________________________________
> From: Guenter Roeck [linux@...ck-us.net]
> Sent: Thursday, October 23, 2014 9:40 AM
> To: Andrew Lunn
> Cc: netdev@...r.kernel.org; David S. Miller; Florian Fainelli; linux-kernel@...r.kernel.org; Chris Healy
> Subject: Re: [PATCH 10/14] net: dsa/mv88e6352: Implement EEPROM         accessfunctions
> 
> On Thu, Oct 23, 2014 at 03:54:12PM +0200, Andrew Lunn wrote:
>> On Wed, Oct 22, 2014 at 09:03:18PM -0700, Guenter Roeck wrote:
>>> MV88E6352 supports read and write access to its configuration eeprom.
>>
>> Hi Guenter
>>
>> I don't have the datasheet for the MV88E6352. Is the EEPROM built in,
>> or external on an i2c bus?
>>
> External.
> 
>>> +static int mv88e6352_get_eeprom_len(struct dsa_switch *ds)
>>> +{
>>> +   return 0x200;
>>> +}
>>
>> How do you handle the case of it being external and not populated.
>> Would it not be better to try to detect it here, and return 0 if it
>> does not exist?
>>
> Makes sense, if it is detectable that it the EEPROM not there. Browsing
> through the datasheet, I don't see how I could detect it; there does not
> seem to be a status bit indicating if the EEPROM is there or not. There
> are sw_mode pins which determine if the eeprom should be loaded after
> reset or not, but I don't see anything in the register set which would
> tell me.
> 
> Chris, do you know if there is a means to detect if the EEPROM is present
> on the MV88E6352 ?
> 
> Thanks,
> Guenter
> 
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> 
> 
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