linux-kernel - RE: [PATCH 2/4] powerpc/device-tree: bindings for DSP cores/clusters for Freescale SOCs

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Date:	Mon, 21 Sep 2015 08:36:06 +0000
From:	Aggrwal Poonam <Poonam.Aggrwal@...escale.com>
To:	Scott Wood <scottwood@...escale.com>
CC:	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>
Subject: RE: [PATCH 2/4] powerpc/device-tree: bindings for DSP cores/clusters
 for Freescale SOCs



> -----Original Message-----
> From: Wood Scott-B07421
> Sent: Sunday, September 20, 2015 5:45 AM
> To: Aggrwal Poonam-B10812 <Poonam.Aggrwal@...escale.com>
> Cc: linuxppc-dev@...ts.ozlabs.org; linux-kernel@...r.kernel.org; devicetree-
> discuss@...ts.ozlabs.org
> Subject: Re: [PATCH 2/4] powerpc/device-tree: bindings for DSP
> cores/clusters for Freescale SOCs
> 
> On Sat, 2015-09-19 at 23:46 +0530, Poonam Aggrwal wrote:
> > From: poonam aggrwal <poonam.aggrwal@...escale.com>
> >
> > Device Tree Bindings for DSP CPU clusters and DSP CPUs for Freescale
> > PowerPC SOCs which have DSP CPUs in addition to PowerPC CPUs.
> > For example B4860 has 3 DSP clusters which have 2 SC3900 cores each.
> >
> > Signed-off-by: Poonam Aggrwal <poonam.aggrwal@...escale.com>
> > ---
> > - based of: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> >   branch master
> >
> > This patch was sent earlier and some comments were received. Some have
> > been taken care; others we can further discuss.  Apologize for not
> > following up on them in time.
> >  .../devicetree/bindings/powerpc/fsl/dsp-cpus.txt   | 78
> > ++++++++++++++++++++++
> >  1 file changed, 78 insertions(+)
> >  create mode 100644
> Documentation/devicetree/bindings/powerpc/fsl/dsp-
> > cpus.txt
> >
> > diff --git
> > a/Documentation/devicetree/bindings/powerpc/fsl/dsp-cpus.txt
> > b/Documentation/devicetree/bindings/powerpc/fsl/dsp-cpus.txt
> > new file mode 100644
> > index 0000000..6d901ef
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/powerpc/fsl/dsp-cpus.txt
> > @@ -0,0 +1,78 @@
> >
> +=========================================================
> ==========
> > +Binding for DSP CPU clusters and DSP CPUs for Freescale SOCs which
> > +have DSP CPUs in addition to PowerPC cpus.
> > +Copyright 2013 Freescale Semiconductor Inc.
> > +
> > +Power Architecture CPUs in Freescale SOCs are represented in device
> > +trees
> > as
> > +per the definition in ePAPR.
> > +
> > +Required properties for DSP CPU cluster:
> > +- compatible : should be "fsl,sc3900-cluster".
> > +- reg : should contain the cluster index
> > +
> > +Required properties for DSP CPU:
> > +- compatible : should be "fsl,sc3900".
> > +- reg : should contain index of DSP CPU within the DSP clsuter.
> > +- next-level-cache : should point to the phandle of the next-level L2
> > cache.
> 
> Why is the dsp-clusters container only shown in the example, not the binding
> itself?

I will try to add more description in the binding for cluster; And the structure of dsp cluster (like sub node of DSP cluster is core, etc).
Did I get your feedback right?
> 
> -Scott