linux-kernel - Re: [PATCHv6 5/5] hwspinlock/omap: add support for dt nodes

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Message-ID: <CAJAp7OisV3UrL45UgRb0tMudyCJHe-xsmsRYV0uGG3P4PReHnA@mail.gmail.com>
Date:	Wed, 19 Nov 2014 16:43:46 -0800
From:	Bjorn Andersson <bjorn@...o.se>
To:	Ohad Ben-Cohen <ohad@...ery.com>
Cc:	Suman Anna <s-anna@...com>, Mark Rutland <mark.rutland@....com>,
	Kumar Gala <galak@...eaurora.org>,
	Tony Lindgren <tony@...mide.com>,
	Josh Cartwright <joshc@...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 <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCHv6 5/5] hwspinlock/omap: add support for dt nodes

On Wed, Nov 12, 2014 at 11:14 AM, Ohad Ben-Cohen <ohad@...ery.com> wrote:
> Hi Suman,
[..]
>
> Does this mean you allow nodes not to have the base_id property? How
> do we protect against multiple nodes not having a base_id property
> then?
>
> Implicitly assuming a base_id value (zero in this case) may not be always safe.
>

Hi Ohad,

I still have a huge problem understanding the awesomeness with the
"base_id". If you have a SoC with 2 hwlock blocks; say 8+8 locks, used
for interaction with e.g. a modem and a video core respectively.
Why would you in either remote system offset the locks with 8?
Wouldn't e.g the modem use locks hwlock0:0-7 and video core use locks
hwlock1:0-7?

What systems use more than one hwlock block and do you know of any
reasons why these hwlocks are globally numbered?

Regards,
Bjorn
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