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Date:	Thu, 23 Oct 2014 20:59:10 -0700
From:	Guenter Roeck <>
To:	Florian Fainelli <>,
	Chris Healy <>, Andrew Lunn <>
CC:	"" <>,
	"David S. Miller" <>,
	"" <>
Subject: Re: [PATCH 10/14] net: dsa/mv88e6352: Implement EEPROM accessfunctions

On 10/23/2014 11:55 AM, Florian Fainelli wrote:
> 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?
Yes, I think that is a good idea.


>> Chris
>> ________________________________________
>> From: Guenter Roeck []
>> Sent: Thursday, October 23, 2014 9:40 AM
>> To: Andrew Lunn
>> Cc:; David S. Miller; Florian Fainelli;; 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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