linux-kernel - Re: [PATCH v6 1/2] DT: hwspinlock: Add binding documentation for Qualcomm hwmutex

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Message-ID: <20150416120127.GM2866@leverpostej>
Date:	Thu, 16 Apr 2015 13:01:27 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	Rob Herring <robherring2@...il.com>
Cc:	Ohad Ben-Cohen <ohad@...ery.com>, Bjorn Andersson <bjorn@...o.se>,
	Tim Bird <tbird20d@...il.com>,
	Bjorn Andersson <bjorn.andersson@...ymobile.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, Suman Anna <s-anna@...com>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	Jeffrey Hugo <jhugo@...eaurora.org>,
	Andy Gross <agross@...eaurora.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kevin Hilman <khilman@...aro.org>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v6 1/2] DT: hwspinlock: Add binding documentation for
 Qualcomm hwmutex

> The part I'm not clear what the purpose of "pool-hwlock" was.

One use-case was a set of hwlocks having no fixed purpose, and being
available for dynamic allocation between the OS and other entities (e.g.
some RTOS on another core).

The set of locks forming a reusable pool, and any information associated
with them (e.g. the logical IDs used by the other entity) are a property
of that interface rather than the hwlock provider.

So you'd describe those pools of locks in some interface-specific
manner, consuming hwlocks from a set of hwlock providers.

Hopefully that doesn't maek things less clear...

Mark.
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