From: Arnd Bergmann <arnd@arndb.de>
To: Ohad Ben-Cohen <ohad@wizery.com>
Cc: "Hilman, Kevin" <khilman@ti.com>,
"Cousson, Benoit" <b-cousson@ti.com>,
Mathieu Poirier <mathieu.poirier@linaro.org>,
"tony@atomide.com" <tony@atomide.com>,
"G, Manjunath Kondaiah" <manjugk@ti.com>,
"devicetree-discuss@lists.ozlabs.org"
<devicetree-discuss@lists.ozlabs.org>,
"grant.likely@secretlab.ca" <grant.likely@secretlab.ca>,
"linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [RFC PATCH 06/10] hwspinlock: OMAP4: Add spinlock support in DT
Date: Mon, 12 Sep 2011 16:32:42 +0200 [thread overview]
Message-ID: <201109121632.42688.arnd@arndb.de> (raw)
In-Reply-To: <CAK=WgbYTo=R1=KhMzLv0iw2qYBPXXyLtB43Z4wvN5p-EvLL9Xw@mail.gmail.com>
On Sunday 11 September 2011, Ohad Ben-Cohen wrote:
> > but instead the controller should have a list of the available
> > spinlocks.
>
> Might make more sense to give it the list of reserved (i.e. those that
> were statically allocated) spinlocks, and then let it treat the rest
> as available.
Fair enough. Whatever you expect to be a shorter list, I guess.
> hwspinlock drivers will tell the core which of their spinlocks are
> reserved, so it can make sure not to allocate them when someone calls
> hwspin_lock_request(). To use those reserved spinlocks, users will
> explicitly have to call hwspin_lock_request_specific().
>
> The controller's node should still have something like a "baseid"
> attribute, and possibly also the number of available spinlocks. The
> latter is a bit redundant though, as drivers already know how many
> spinlocks are available (at least the OMAP driver reads it from an
> hardware register. The U8500 one seem just to have it hardcoded in the
> driver).
>
> Vast majority of hwspinlocks are not statically allocated, so this
> would keep the DT minimal, and IMHO, cleaner.
Ok.
Arnd
WARNING: multiple messages have this Message-ID (diff)
From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH 06/10] hwspinlock: OMAP4: Add spinlock support in DT
Date: Mon, 12 Sep 2011 16:32:42 +0200 [thread overview]
Message-ID: <201109121632.42688.arnd@arndb.de> (raw)
In-Reply-To: <CAK=WgbYTo=R1=KhMzLv0iw2qYBPXXyLtB43Z4wvN5p-EvLL9Xw@mail.gmail.com>
On Sunday 11 September 2011, Ohad Ben-Cohen wrote:
> > but instead the controller should have a list of the available
> > spinlocks.
>
> Might make more sense to give it the list of reserved (i.e. those that
> were statically allocated) spinlocks, and then let it treat the rest
> as available.
Fair enough. Whatever you expect to be a shorter list, I guess.
> hwspinlock drivers will tell the core which of their spinlocks are
> reserved, so it can make sure not to allocate them when someone calls
> hwspin_lock_request(). To use those reserved spinlocks, users will
> explicitly have to call hwspin_lock_request_specific().
>
> The controller's node should still have something like a "baseid"
> attribute, and possibly also the number of available spinlocks. The
> latter is a bit redundant though, as drivers already know how many
> spinlocks are available (at least the OMAP driver reads it from an
> hardware register. The U8500 one seem just to have it hardcoded in the
> driver).
>
> Vast majority of hwspinlocks are not statically allocated, so this
> would keep the DT minimal, and IMHO, cleaner.
Ok.
Arnd
next prev parent reply other threads:[~2011-09-12 14:32 UTC|newest]
Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-24 13:09 [RFC PATCH 00/10] OMAP: Add DT support for early init OMAP4 devices Benoit Cousson
2011-08-24 13:09 ` Benoit Cousson
[not found] ` <1314191356-10963-1-git-send-email-b-cousson-l0cyMroinI0@public.gmane.org>
2011-08-24 13:09 ` [RFC PATCH 01/10] OMAP2+: l3-noc: Add support for device-tree Benoit Cousson
2011-08-24 13:09 ` Benoit Cousson
2011-09-08 18:01 ` Grant Likely
2011-09-08 18:01 ` Grant Likely
[not found] ` <20110908180148.GA2967-e0URQFbLeQY2iJbIjFUEsiwD8/FfD2ys@public.gmane.org>
2011-09-08 21:59 ` Cousson, Benoit
2011-09-08 21:59 ` Cousson, Benoit
2011-09-08 23:35 ` Grant Likely
2011-09-08 23:35 ` Grant Likely
2011-08-24 13:09 ` [RFC PATCH 02/10] arm/dts: OMAP4: Add a main ocp entry bound to l3-noc driver Benoit Cousson
2011-08-24 13:09 ` Benoit Cousson
[not found] ` <1314191356-10963-3-git-send-email-b-cousson-l0cyMroinI0@public.gmane.org>
2011-09-08 18:03 ` Grant Likely
2011-09-08 18:03 ` Grant Likely
2011-09-09 0:10 ` Cousson, Benoit
2011-09-09 0:10 ` Cousson, Benoit
2011-09-09 2:41 ` Grant Likely
2011-09-09 2:41 ` Grant Likely
2011-08-24 13:09 ` [RFC PATCH 03/10] documentation/dt: Add l3-noc bindings Benoit Cousson
2011-08-24 13:09 ` Benoit Cousson
2011-09-08 18:06 ` Grant Likely
2011-09-08 18:06 ` Grant Likely
2011-09-09 0:18 ` Cousson, Benoit
2011-09-09 0:18 ` Cousson, Benoit
2011-08-24 13:09 ` [RFC PATCH 06/10] hwspinlock: OMAP4: Add spinlock support in DT Benoit Cousson
2011-08-24 13:09 ` Benoit Cousson
2011-09-07 19:58 ` Ohad Ben-Cohen
2011-09-07 19:58 ` Ohad Ben-Cohen
2011-09-08 7:14 ` Cousson, Benoit
2011-09-08 7:14 ` Cousson, Benoit
2011-09-08 7:56 ` Ohad Ben-Cohen
2011-09-08 7:56 ` Ohad Ben-Cohen
2011-09-08 8:07 ` Cousson, Benoit
2011-09-08 8:07 ` Cousson, Benoit
2011-09-08 8:11 ` Ohad Ben-Cohen
2011-09-08 8:11 ` Ohad Ben-Cohen
2011-09-08 14:47 ` Arnd Bergmann
2011-09-08 14:47 ` Arnd Bergmann
2011-09-08 15:34 ` Cousson, Benoit
2011-09-08 15:34 ` Cousson, Benoit
[not found] ` <4E68E09B.4050006-l0cyMroinI0@public.gmane.org>
2011-09-08 16:03 ` Arnd Bergmann
2011-09-08 16:03 ` Arnd Bergmann
[not found] ` <201109081647.55377.arnd-r2nGTMty4D4@public.gmane.org>
2011-09-08 16:36 ` Ohad Ben-Cohen
2011-09-08 16:36 ` Ohad Ben-Cohen
2011-09-09 12:58 ` Arnd Bergmann
2011-09-09 12:58 ` Arnd Bergmann
2011-09-11 7:57 ` Ohad Ben-Cohen
2011-09-11 7:57 ` Ohad Ben-Cohen
2011-09-12 14:32 ` Arnd Bergmann [this message]
2011-09-12 14:32 ` Arnd Bergmann
2011-08-24 13:09 ` [RFC PATCH 04/10] arm/dts: OMAP4: Add mpu, dsp and iva nodes Benoit Cousson
2011-08-24 13:09 ` Benoit Cousson
[not found] ` <1314191356-10963-5-git-send-email-b-cousson-l0cyMroinI0@public.gmane.org>
2011-09-08 18:07 ` Grant Likely
2011-09-08 18:07 ` Grant Likely
2011-08-24 13:09 ` [RFC PATCH 05/10] documentation/dt: Add mpu, dsp and iva bindings Benoit Cousson
2011-08-24 13:09 ` Benoit Cousson
[not found] ` <1314191356-10963-6-git-send-email-b-cousson-l0cyMroinI0@public.gmane.org>
2011-09-08 18:09 ` Grant Likely
2011-09-08 18:09 ` Grant Likely
2011-09-09 0:30 ` Cousson, Benoit
2011-09-09 0:30 ` Cousson, Benoit
2011-09-09 2:40 ` Grant Likely
2011-09-09 2:40 ` Grant Likely
2011-08-24 13:09 ` [RFC PATCH 07/10] documentation/dt: Add spinlock bindings Benoit Cousson
2011-08-24 13:09 ` Benoit Cousson
[not found] ` <1314191356-10963-8-git-send-email-b-cousson-l0cyMroinI0@public.gmane.org>
2011-09-08 18:10 ` Grant Likely
2011-09-08 18:10 ` Grant Likely
2011-09-09 0:32 ` Cousson, Benoit
2011-09-09 0:32 ` Cousson, Benoit
2011-08-24 13:09 ` [RFC PATCH 08/10] gpio/omap: Adapt GPIO driver to DT Benoit Cousson
2011-08-24 13:09 ` Benoit Cousson
[not found] ` <1314191356-10963-9-git-send-email-b-cousson-l0cyMroinI0@public.gmane.org>
2011-09-08 18:15 ` Grant Likely
2011-09-08 18:15 ` Grant Likely
2011-09-09 1:48 ` Cousson, Benoit
2011-09-09 1:48 ` Cousson, Benoit
2011-08-24 13:09 ` [RFC PATCH 09/10] arm/dts: OMAP4: Add gpio nodes Benoit Cousson
2011-08-24 13:09 ` Benoit Cousson
[not found] ` <1314191356-10963-10-git-send-email-b-cousson-l0cyMroinI0@public.gmane.org>
2011-09-08 18:16 ` Grant Likely
2011-09-08 18:16 ` Grant Likely
2011-08-24 13:09 ` [RFC PATCH 10/10] documentation/dt: Add OMAP GPIO properties Benoit Cousson
2011-08-24 13:09 ` Benoit Cousson
[not found] ` <1314191356-10963-11-git-send-email-b-cousson-l0cyMroinI0@public.gmane.org>
2011-09-08 18:18 ` Grant Likely
2011-09-08 18:18 ` Grant Likely
2011-09-09 1:51 ` Cousson, Benoit
2011-09-09 1:51 ` Cousson, Benoit
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