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

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Message-ID: <20141023135412.GC25190@lunn.ch>
Date:	Thu, 23 Oct 2014 15:54:12 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Florian Fainelli <f.fainelli@...il.com>,
	Andrew Lunn <andrew@...n.ch>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/14] net: dsa/mv88e6352: Implement EEPROM access
 functions

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?

> +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?

      Andrew
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