New chip driver development plan to Lm_sensors

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Hi Mark M. Hoffman

This is chunhao

> When we (lm_sensors people) talk about VRM, we are talking
specifically
> about the interpretation of the VID lines; i.e. the formula for
converting
> from 4-6 binary inputs to a voltage.  Intel has many standards for the
> processor VRM, the latest of which can be found here:
> 	http://developer.intel.com/design/Xeon/guides/302731.htm
I see, I have downloaded the document, and will refer it when I'm free
Thanks

> The vrm value for w83791d in the w83781d driver is not *fixed* to 90,
> it is merely *initialized* to that.  The user is free to change this
> value.  You may wonder why the user is allowed to change it at all,
> when the value obviously depends on what type of processor is present.
> Well, in the 2.6 kernel we made some moves in that direction: see
> drivers/i2c/i2c-sensor-vid.c.
> 
> So to answer your immediate question ... from the recently posted 792
> datasheet, it looks like VRM 9.0 and 10.0 are supported.  You'll
> want to pick one of these as a default, but still allow the user to
> choose the other one.
> 
> Wait a sec... just read the 792 datasheet a little more closely.  That
> part also supports some sort of VID *outputs* as well.  That could be
> downright dangerous to fool around with.  I wonder what you're
planning
> to do with that?  I'll have a look at your driver at some point.
To tell you the truth, the VRM and VID is NOT important to me, I can
omit
it in my w83792d.c, but since there are w83781d_vrm() and w83781d_vid()
in w83781d.c, I also add two function w83792d_vrm() and w83792d_vid()
into w83792d.c. their function maybe incomplete now, so I sent you the
above mail to ask you about it. ;-)

One of my managers will send you a rough version of 792 driver today or
tomorrow, then please give me more information about it after your
review
to my source. And if there are some bugs in 792 driver please tell us.
:-)


> Now for my own question to you: I have a w83791sd on my mainboard.
> Will you publish a better datasheet for that one?  The datasheet that
> is currently available on your website doesn't have enough info to
> create a driver.
As to this question, I have asked the help of my manager, he will give
me the answer in the near future, then I will send mail to you.
Would you please tell me the version number of your available
w83791sd data sheet? So that we can know whether it has been updated.

Thanks

Best Regards
Chunhao


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