Re: [PATCH v7 1/4] Documentation: dt: add common bindings for hwspinlock

From: Bjorn Andersson
Date: Mon Feb 16 2015 - 15:30:45 EST

On Fri, Jan 30, 2015 at 9:41 PM, Ohad Ben-Cohen <ohad@xxxxxxxxxx> wrote:
> Since the existence of several hwblocks is still fictional (Bjorn,
> please confirm too?), we may prefer to introduce changes to support it
> only when it shows up; it all depends on the amount of changes needed.
> Suman, care to take a look please?

It turns out that the Qualcomm platforms have two additional "remote
spinlock" mechanisms - both using shared memory.

On most platforms only 1 (out of these 3) is actually consumed, but
e.g. the older msm7x30 uses 2 of them (SMEM and DAL). Due to its age I
don't think it's on anyones todo list to actually support this
platform as of today; but it's out there.

None of these hwlocks are allocated dynamically, so if needed a
dynamic base_id (-1 like other frameworks) would be a acceptable
solution - and can easily be implemented when we need it.

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