linux-kernel - Re: [PATCH] eeprom: at24: Add support for large EEPROMs connected to SMBus adapters

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Message-ID: <20150212040126.GA1691@roeck-us.net>
Date:	Wed, 11 Feb 2015 20:01:26 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Wolfram Sang <wsa@...-dreams.de>
Cc:	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] eeprom: at24: Add support for large EEPROMs connected to
 SMBus adapters

On Thu, Feb 05, 2015 at 09:53:26AM -0800, Guenter Roeck wrote:
> On Thu, Feb 05, 2015 at 03:40:28PM +0100, Wolfram Sang wrote:
> > > > > At the same time multi-master access is quite rare.
> > > > 
> > > > It should still work in those rare cases. A setup of an SoC, an EC
> > > > (those like to be masters, as well), and an EEPROM is not very far off.
> > 
> > To clarify: What I meant here is, at24 should also work in those rare
> > cases reliably (like the described case of SoC, EC and EEPROM). Your
> > patch sacrificies this reliability.
> > 
> But it won't, and it can't. 24c32 should simply not be used in such cases.
> Besides, at least on PCs, ACPI should reserve and thus block SMBus access
> if it is used by an EC (or IPMI or similar).
> 
> I don't think it should (or even can) be the Linux kernel's responsibility
> to ensure that the hardware does not prevent such problems.
> 
Hi Wolfram,

I wonder where we are with thisp patch; I don't recall a reply to my previous
e-mail.

Do you need some more time to think about it ? Otherwise I'll publish an
out-of-tree version of the at24 driver with the patch applied on github,
for those who might need the functionality provided by this patch.

Please let me know.

Thanks,
Guenter
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