From: Josh Cartwright <joshc@codeaurora.org>
To: Suman Anna <s-anna@ti.com>
Cc: Ohad Ben-Cohen <ohad@wizery.com>,
Mark Rutland <mark.rutland@arm.com>,
Kumar Gala <galak@codeaurora.org>,
Rob Herring <robherring2@gmail.com>,
Tony Lindgren <tony@atomide.com>,
Josh Cartwright <joshc@codeaurora.org>,
Bjorn Andersson <bjorn@kryo.se>,
linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org,
devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCHv5 RFC 12/15] hwspinlock/core: add OF helper to parse reserved locks
Date: Mon, 5 May 2014 16:54:22 -0500 [thread overview]
Message-ID: <20140505215422.GD5546@joshc.qualcomm.com> (raw)
In-Reply-To: <53680639.1080405@ti.com>
On Mon, May 05, 2014 at 04:44:25PM -0500, Suman Anna wrote:
> Hi Rob,
>
> On 04/30/2014 07:34 PM, Suman Anna wrote:
> > The property 'hwlock-reserved-locks' will be used to represent
> > the number of locks to be reserved for clients that would need
> > to request/operate on specific locks. A new OF helper function,
> > of_hwspin_lock_get_num_reserved_locks(), is added to minimize
> > duplication in different platform implementations.
> >
> > The function will return a value of 0 if the property is not
> > defined, so as to support a default behavior of marking all
> > locks as unused and open for anonymous allocations.
> >
> > Signed-off-by: Suman Anna <s-anna@ti.com>
> > ---
> > .../devicetree/bindings/hwlock/hwlock.txt | 3 +++
> > drivers/hwspinlock/hwspinlock_core.c | 25 ++++++++++++++++++++++
> > include/linux/hwspinlock.h | 1 +
> > 3 files changed, 29 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/hwlock/hwlock.txt b/Documentation/devicetree/bindings/hwlock/hwlock.txt
> > index d538a9b..88d16d2 100644
> > --- a/Documentation/devicetree/bindings/hwlock/hwlock.txt
> > +++ b/Documentation/devicetree/bindings/hwlock/hwlock.txt
> > @@ -18,6 +18,9 @@ Common properties:
> > property is needed on hwlock devices, where the number
> > of supported locks within a hwlock device cannot be
> > read from a register.
> > +- hwlock-reserved-locks: Number of locks to reserve for clients requiring
> > + specific locks. This value cannot exceed the value of
> > + hwlock-num-locks.
>
> Any suggestions here on the approach? This property falls into a gray
> area as well, as the current approach is somewhat limiting (it doesn't
> support sparse reserved locks, and expects them at the beginning of the
> lock range).
Is it possible to implement a pinctrl-like hogging approach, whereby the
specific locks that need to be reserved are consumed by the controller
itself?
Josh
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
hosted by The Linux Foundation
next prev parent reply other threads:[~2014-05-05 21:58 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-01 0:34 [PATCHv5 00/15] hwspinlock/omap dt support Suman Anna
2014-05-01 0:34 ` [PATCHv5 01/15] Documentation: dt: add common bindings for hwspinlock Suman Anna
2014-05-02 14:58 ` Rob Herring
2014-05-02 22:46 ` Suman Anna
2014-05-01 0:34 ` [PATCHv5 02/15] Documentation: dt: add the omap hwspinlock bindings document Suman Anna
2014-05-01 0:34 ` [PATCHv5 03/15] hwspinlock/core: maintain a list of registered hwspinlock banks Suman Anna
2014-07-01 12:26 ` Ohad Ben-Cohen
2014-07-02 21:14 ` Suman Anna
2014-07-03 7:00 ` Ohad Ben-Cohen
2014-07-03 17:28 ` Suman Anna
2014-07-04 5:01 ` Ohad Ben-Cohen
2014-07-08 15:22 ` Suman Anna
2014-05-01 0:34 ` [PATCHv5 04/15] hwspinlock/core: add common OF helpers Suman Anna
2014-07-01 12:45 ` Ohad Ben-Cohen
2014-07-02 21:14 ` Suman Anna
2014-07-03 7:15 ` Ohad Ben-Cohen
2014-07-03 17:35 ` Suman Anna
2014-07-04 4:58 ` Ohad Ben-Cohen
2014-07-08 15:37 ` Suman Anna
2014-05-01 0:34 ` [PATCHv5 05/15] hwspinlock/omap: add support for dt nodes Suman Anna
2014-07-01 12:48 ` Ohad Ben-Cohen
2014-07-02 19:42 ` Suman Anna
2014-07-03 7:25 ` Ohad Ben-Cohen
2014-05-01 0:34 ` [PATCHv5 06/15] hwspinlock/omap: enable module before reading SYSSTATUS register Suman Anna
2014-07-01 12:51 ` Ohad Ben-Cohen
2014-07-02 19:38 ` Suman Anna
2014-05-01 0:34 ` [PATCHv5 07/15] hwspinlock/omap: enable build for AM33xx, AM43xx & DRA7xx Suman Anna
2014-07-01 12:53 ` Ohad Ben-Cohen
2014-05-01 0:34 ` [PATCHv5 RFC 08/15] hwspinlock/core: add support for base id in DT Suman Anna
2014-05-05 20:37 ` Rob Herring
2014-05-05 21:37 ` Suman Anna
2014-05-01 0:34 ` [PATCHv5 RFC 09/15] hwspinlock/core: prepare unregister code to support reserved locks Suman Anna
2014-05-01 0:34 ` [PATCHv5 RFC 10/15] hwspinlock/core: prepare core " Suman Anna
2014-05-01 0:34 ` [PATCHv5 RFC 11/15] hwspinlock/core: add support for " Suman Anna
2014-05-01 0:34 ` [PATCHv5 RFC 12/15] hwspinlock/core: add OF helper to parse " Suman Anna
2014-05-05 21:44 ` Suman Anna
2014-05-05 21:54 ` Josh Cartwright [this message]
2014-05-10 1:17 ` Suman Anna
2014-05-01 0:34 ` [PATCHv5 RFC 13/15] hwspinlock/omap: use OF helper to get " Suman Anna
2014-05-01 0:34 ` [PATCHv5 RFC 14/15] hwspinlock/core: return ERR_PTRs on failure in _request_ api Suman Anna
2014-05-01 0:34 ` [PATCHv5 RFC 15/15] hwspinlock/core: change return codes of_hwspin_lock_request_specific Suman Anna
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