Re: [PATCH 1/2] i2c_imc: New driver for Intel's iMC, found on LGA2011 chips

From: Andy Lutomirski
Date: Sun Mar 08 2015 - 15:56:25 EST

On Sun, Mar 8, 2015 at 12:50 PM, Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
> On 03/08/2015 12:30 PM, Andy Lutomirski wrote:
> [ ... ]
>>>> One other question: from my reading of the spec, it should be possible
>>>> to
>>>> augment this driver to expose a temporate sensor subdevice that shows
>>>> recent cached temperatures from HW DIMM measurements. They would be
>>>> redundant with the jc42 outputs, but it would be safe to use them even
>>>> on
>>>> systems without safe SMBUS arbitration. Should I do that as a followup
>>>> later on?
>>> Without thinking too much about it, this should be a separate driver,
>>> and I think it might actually be more valuable (since less risky)
>>> than this entire patch set.
>> The main problem there is that they'll fight over the PCI ids.
> That is why we have mfd drivers. While that most likely won't be a
> solution here (and I don't suggest it), you can use the same idea.
> If can not be instantiated as pci driver, the alternative would be
> to instantiate it as platform driver and let it get its pci
> information from the parent device.

Hmm. It could make sense to have an Intel chipset driver that
instantiates sub-devices for thermal monitoring, smbus, and EDAC. It
might be a bit of a cleanup for sb-edac, too.

Anyway, this isn't currently necessary. Let's deal with it when we get there.

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