From: Florian Fainelli <f.fainelli@gmail.com>
To: Chris Healy <chealy@imsco-us.com>,
Guenter Roeck <linux@roeck-us.net>, Andrew Lunn <andrew@lunn.ch>
Cc: "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"David S. Miller" <davem@davemloft.net>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 10/14] net: dsa/mv88e6352: Implement EEPROM accessfunctions
Date: Thu, 23 Oct 2014 11:55:38 -0700 [thread overview]
Message-ID: <54494F2A.10509@gmail.com> (raw)
In-Reply-To: <724F6C6CDC8C86478473775085778C4E0A465931@ImsEx1.ims.dom>
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@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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>
>
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next prev parent reply other threads:[~2014-10-23 18:55 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-23 4:03 [PATCH 00/14] net: dsa: Fixes and enhancements Guenter Roeck
2014-10-23 4:03 ` [PATCH 01/14] net: dsa: Don't set skb->protocol on outgoing tagged packets Guenter Roeck
2014-10-23 4:03 ` [PATCH 02/14] net: dsa: Report known silicon revisions for Marvell 88E6060 Guenter Roeck
2014-10-23 12:51 ` Sergei Shtylyov
2014-10-23 13:20 ` Guenter Roeck
2014-10-23 16:00 ` Sergei Shtylyov
2014-10-23 4:03 ` [PATCH 03/14] net: dsa: Report known silicon revisions for Marvell 88E6131 Guenter Roeck
2014-10-23 4:03 ` [PATCH 04/14] net: dsa: Add support for Marvell 88E6352 Guenter Roeck
2014-10-23 4:03 ` [PATCH 05/14] net: dsa/mv88e6352: Add support for MV88E6176 Guenter Roeck
2014-10-23 4:03 ` [PATCH 06/14] net: dsa: Add support for hardware monitoring Guenter Roeck
2014-10-23 4:37 ` Florian Fainelli
2014-10-23 5:06 ` Guenter Roeck
2014-10-23 8:24 ` Richard Cochran
2014-10-23 13:27 ` Guenter Roeck
2014-10-23 13:47 ` Andrew Lunn
2014-10-23 16:27 ` Guenter Roeck
2014-10-23 16:54 ` Andrew Lunn
2014-10-23 17:38 ` Guenter Roeck
2014-10-23 18:03 ` Andrew Lunn
2014-10-23 18:43 ` Guenter Roeck
2014-10-23 19:55 ` Andrew Lunn
2014-10-24 13:53 ` Guenter Roeck
2014-10-24 16:19 ` Guenter Roeck
2014-10-25 14:01 ` Andrew Lunn
2014-10-25 17:23 ` Florian Fainelli
2014-10-25 18:00 ` Andrew Lunn
2014-10-26 15:57 ` Guenter Roeck
2014-10-25 17:26 ` Florian Fainelli
2014-10-25 19:44 ` Guenter Roeck
2014-10-24 5:03 ` David Miller
2014-10-24 5:40 ` Guenter Roeck
2014-10-24 6:10 ` David Miller
2014-10-24 12:52 ` Florian Fainelli
2014-10-24 6:09 ` Guenter Roeck
2014-10-23 4:03 ` [PATCH 07/14] net: dsa/mv88e6352: Report chip temperature Guenter Roeck
2014-10-23 4:03 ` [PATCH 08/14] net: dsa/mv88e6123_61_65: " Guenter Roeck
2014-10-23 4:03 ` [PATCH 09/14] net: dsa: Add support for switch EEPROM access Guenter Roeck
2014-10-23 4:03 ` [PATCH 10/14] net: dsa/mv88e6352: Implement EEPROM access functions Guenter Roeck
2014-10-23 13:54 ` Andrew Lunn
2014-10-23 16:40 ` Guenter Roeck
2014-10-23 18:41 ` [PATCH 10/14] net: dsa/mv88e6352: Implement EEPROM accessfunctions Chris Healy
2014-10-23 18:55 ` Florian Fainelli [this message]
2014-10-24 3:59 ` Guenter Roeck
2014-10-23 4:03 ` [PATCH 11/14] net: dsa: Add support for reading switch registers with ethtool Guenter Roeck
2014-10-23 4:40 ` Florian Fainelli
2014-10-23 5:21 ` Guenter Roeck
2014-10-23 4:03 ` [PATCH 12/14] net: dsa/mv88e6123_61_65: Add support for reading switch registers Guenter Roeck
2014-10-23 4:03 ` [PATCH 13/14] net: dsa/mv88e6352: " Guenter Roeck
2014-10-23 4:03 ` [PATCH 14/14] net: dsa: Provide additional RMON statistics Guenter Roeck
2014-10-23 4:45 ` [PATCH 00/14] net: dsa: Fixes and enhancements Florian Fainelli
2014-10-23 5:22 ` Guenter Roeck
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