linux-kernel - Re: [PATCH v2 01/11] msm: Add CPU queries

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Date:	Tue, 25 Jan 2011 09:35:10 -0800
From:	Daniel Walker <dwalker@...eaurora.org>
To:	David Brown <davidb@...eaurora.org>
Cc:	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 01/11] msm: Add CPU queries

On Mon, 2011-01-24 at 16:57 -0800, David Brown wrote:
> On Mon, Jan 24 2011, Daniel Walker wrote:
> 
> > On Mon, 2011-01-24 at 16:20 -0800, David Brown wrote:
> >> On Mon, Jan 24 2011, Daniel Walker wrote:
> >> 
> >> > On Wed, 2011-01-19 at 12:25 -0800, David Brown wrote:
> >> >> +#define cpu_is_msm7x01()       0
> >> >> +#define cpu_is_msm7x30()       0
> >> >> +#define cpu_is_qsd8x50()       0
> >> >> +#define cpu_is_msm8x60()       0
> >> >
> >> > Now that I look at this again, why not drop the "x" all together ?
> >> 
> >> That might be better for the 8x60.  The complexity is that most of the
> >> MSM chips have some variants, where the CPU running Linux isn't changed,
> >> but the modem CPU is different (think CDMA/UMTS).  Until 8960, that was
> >> distinguished by the second letter.
> >> 
> >> Either way doesn't quite match reality, unfortunately.  There are
> >> devices using a MSM7201 and others using a MSM7601.  As far as Linux is
> >> concerned, there isn't any difference between them.  If someone wanted
> >> to try and identify the device they have with the code, it could be
> >> confusing for either name chosen.
> >> 
> >> I was planning on turning msm8x60 into msm8660, since that seems to be
> >> the most common one.  Perhaps the decoder ring should be put into the
> >> help text for the options so people can at least figure out which is
> >> which.
> >
> > Are there any of those which do , right now, have Linux support for more
> > than one variant ?
> 
> All of them, in fact.
> 
> MSM7201 and MSM7601 are identical as far as Linux is concerned.  Same
> goes for MSM8250 and MSM8650.  Our dev boards are a somewhat random mix
> of the two, and it doesn't matter which one you use.
> 
> MSM8960 is a completely different chip, it just shares a similar name,
> to other chips.

If you break it down without the "x" then you can recreate the "x"
variant with the actual numerical identifier .. For 8660/8960 you just
would do as much of a unification as with the others.. You could still
use 8x60 to identify those two, you just wouldn't use it as often.

Daniel

-- 

Sent by a consultant of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.

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