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

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Date:	Mon, 16 Feb 2015 12:30:37 -0800
From:	Bjorn Andersson <bjorn@...o.se>
To:	Ohad Ben-Cohen <ohad@...ery.com>
Cc:	Mark Rutland <mark.rutland@....com>,
	Rob Herring <robherring2@...il.com>,
	Suman Anna <s-anna@...com>, Kumar Gala <galak@...eaurora.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH v7 1/4] Documentation: dt: add common bindings for hwspinlock

On Fri, Jan 30, 2015 at 9:41 PM, Ohad Ben-Cohen <ohad@...ery.com> 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.

Regards,
Bjorn
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