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.
Thanks,
Guenter
Chris
________________________________________
From: Guenter Roeck [li...@roeck-us.net]
Sent: Thursday, October 23, 2014 9:40 AM
To: Andrew Lunn
Cc: net...@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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