From: Mark Rutland <mark.rutland@arm.com>
To: Suman Anna <s-anna@ti.com>
Cc: Ohad Ben-Cohen <ohad@wizery.com>,
Kumar Gala <galak@codeaurora.org>,
Bjorn Andersson <bjorn@kryo.se>,
Josh Cartwright <joshc@codeaurora.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
Rob Herring <robh+dt@kernel.org>
Subject: Re: [PATCH v7 1/4] Documentation: dt: add common bindings for hwspinlock
Date: Thu, 15 Jan 2015 13:55:56 +0000 [thread overview]
Message-ID: <20150115135556.GH16217@leverpostej> (raw)
In-Reply-To: <20150115135201.GG16217@leverpostej>
On Thu, Jan 15, 2015 at 01:52:01PM +0000, Mark Rutland wrote:
> On Wed, Jan 14, 2015 at 08:58:18PM +0000, Suman Anna wrote:
> > This patch adds the generic common bindings used to represent
> > a hwlock device and use/request locks in a device-tree build.
> >
> > All the platform-specific hwlock driver implementations need the
> > number of locks and associated base id for registering the locks
> > present within the device with the driver core. This base id
> > needs to be unique across multiple IP instances of a hwspinlock
> > device, so that each hwlock can be represented uniquely in a
> > system.
> >
> > The number of locks is represented by 'hwlock-num-locks' property,
> > and the base id is represented by the 'hwlock-base-id' property.
> > The args specifier length is dependent on each vendor-specific
> > implementation and is represented through the '#hwlock-cells'
> > property. Client users need to use the property 'hwlocks' for
> > requesting specific lock(s).
> >
> > Note that the document is named hwlock.txt deliberately to keep
> > it a bit more generic.
> >
> > Cc: Rob Herring <robh+dt@kernel.org>
> > Signed-off-by: Suman Anna <s-anna@ti.com>
> > ---
> > v7: Revised binding info for hwlock-base-id, it is mandatory now
> >
> > .../devicetree/bindings/hwlock/hwlock.txt | 55 ++++++++++++++++++++++
> > 1 file changed, 55 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/hwlock/hwlock.txt
> >
> > diff --git a/Documentation/devicetree/bindings/hwlock/hwlock.txt b/Documentation/devicetree/bindings/hwlock/hwlock.txt
> > new file mode 100644
> > index 000000000000..8de7aaf878f9
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/hwlock/hwlock.txt
> > @@ -0,0 +1,55 @@
> > +Generic hwlock bindings
> > +=======================
> > +
> > +Generic bindings that are common to all the hwlock platform specific driver
> > +implementations.
> > +
> > +The validity and need of these common properties may vary from one platform
> > +implementation to another. The platform specific bindings should explicitly
> > +state if an optional property is used. Please also look through the individual
> > +platform specific hwlock binding documentations for identifying the applicable
> > +properties.
> > +
> > +Common properties:
> > +- #hwlock-cells: Specifies the number of cells needed to represent a
> > + specific lock. This property is mandatory for all
> > + platform implementations.
> > +- hwlock-num-locks: Number of locks present in a hwlock device. This
> > + property is needed on hwlock devices, where the number
> > + of supported locks within a hwlock device cannot be
> > + read from a register.
> > +- hwlock-base-id: An unique base Id for the locks for a particular hwlock
> > + device. This property is mandatory for all platform
> > + implementations.
>
> This property makes no sense. The ID encoded in the hwlock cells is
> relative to the instance (identified by phandle), not global. So the DT
> has no global ID space.
>
> Why do you think you need this?
Having looked at the way this proeprty is used, NAK.
If you need to carve up a Linux-internal ID space, do that dynamically.
There is no need for this property.
Mark.
next prev parent reply other threads:[~2015-01-15 13:56 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-14 20:58 [PATCH v7 0/4] hwspinlock core & omap dt support Suman Anna
2015-01-14 20:58 ` [PATCH v7 1/4] Documentation: dt: add common bindings for hwspinlock Suman Anna
2015-01-15 13:52 ` Mark Rutland
2015-01-15 13:55 ` Mark Rutland [this message]
2015-01-15 14:42 ` Rob Herring
2015-01-15 20:16 ` Suman Anna
2015-01-16 6:09 ` Ohad Ben-Cohen
2015-01-16 10:17 ` Mark Rutland
2015-01-17 0:46 ` Ohad Ben-Cohen
2015-01-20 18:05 ` Tony Lindgren
2015-01-21 12:41 ` Ohad Ben-Cohen
2015-01-21 17:56 ` Suman Anna
2015-01-22 18:56 ` Mark Rutland
2015-01-29 3:58 ` Suman Anna
2015-02-11 11:29 ` Mark Rutland
2015-02-16 18:06 ` Bjorn Andersson
2015-01-30 23:29 ` Bjorn Andersson
2015-01-31 5:41 ` Ohad Ben-Cohen
2015-02-01 11:00 ` Ohad Ben-Cohen
2015-02-02 21:14 ` Suman Anna
2015-02-01 17:55 ` Bjorn Andersson
2015-02-02 21:07 ` Suman Anna
2015-02-05 23:01 ` Bjorn Andersson
2015-02-06 0:11 ` Suman Anna
2015-02-06 0:34 ` Bjorn Andersson
2015-02-11 10:29 ` Ohad Ben-Cohen
2015-02-11 11:35 ` Mark Rutland
2015-02-16 20:30 ` Bjorn Andersson
2015-01-16 10:19 ` Mark Rutland
2015-01-16 17:49 ` Suman Anna
2015-01-14 20:58 ` [PATCH v7 2/4] Documentation: dt: add the omap hwspinlock bindings document Suman Anna
2015-01-14 20:58 ` [PATCH v7 3/4] hwspinlock/core: add common OF helpers Suman Anna
2015-01-14 20:58 ` [PATCH v7 4/4] hwspinlock/omap: add support for dt nodes Suman Anna
2015-01-15 10:13 ` [PATCH v7 0/4] hwspinlock core & omap dt support Ohad Ben-Cohen
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