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    SubjectRE: [PATCH 10/14] net: dsa/mv88e6352: Implement EEPROM accessfunctions
    Date
    Hi Guenter,

    I do not believe it is possible to know if an EEPROM is attached or not.

    Chris
    ________________________________________
    From: Guenter Roeck [linux@roeck-us.net]
    Sent: Thursday, October 23, 2014 9:40 AM
    To: Andrew Lunn
    Cc: netdev@vger.kernel.org; David S. Miller; Florian Fainelli; linux-kernel@vger.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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