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

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Date:	Mon, 24 Jan 2011 16:57:54 -0800
From:	David Brown <davidb@...eaurora.org>
To:	Daniel Walker <dwalker@...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, 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.

David

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