linux-kernel - Re: [PATCH V5 18/30] dt-bindings: csky CPU Bindings

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Date:   Fri, 28 Sep 2018 09:03:13 +0800
From:   Guo Ren <ren_guo@...ky.com>
To:     Rob Herring <robh@...nel.org>
Cc:     akpm@...ux-foundation.org, arnd@...db.de,
        daniel.lezcano@...aro.org, davem@...emloft.net,
        gregkh@...uxfoundation.org, jason@...edaemon.net,
        marc.zyngier@....com, mark.rutland@....com,
        mchehab+samsung@...nel.org, peterz@...radead.org,
        tglx@...utronix.de, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, devicetree@...r.kernel.org,
        green.hu@...il.com, palmer@...ive.com
Subject: Re: [PATCH V5 18/30] dt-bindings: csky CPU Bindings

On Thu, Sep 27, 2018 at 11:43:17AM -0500, Rob Herring wrote:
> On Tue, Sep 25, 2018 at 07:39:21AM +0800, Guo Ren wrote:
> > This patch adds the documentation to describe that how to add cpu nodes in
> > dts for SMP.
> > 
> > Signed-off-by: Guo Ren <ren_guo@...ky.com>
> > ---
> >  Documentation/devicetree/bindings/csky/cpus.txt | 70 +++++++++++++++++++++++++
> >  1 file changed, 70 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/csky/cpus.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/csky/cpus.txt b/Documentation/devicetree/bindings/csky/cpus.txt
> > new file mode 100644
> > index 0000000..ee3901d
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/csky/cpus.txt
> > @@ -0,0 +1,70 @@
> > +==================
> > +C-SKY CPU Bindings
> > +==================
> > +
> > +The device tree allows to describe the layout of CPUs in a system through
> > +the "cpus" node, which in turn contains a number of subnodes (ie "cpu")
> > +defining properties for every cpu.
> > +
> > +Only SMP system need to care about the cpus node and single processor
> > +needn't define cpus node at all.
> 
> We've generally found this is not true. Even for single core, you can 
> have power domains, clocks for DVFS, etc.
Ok, I'll remove it.

> 
> > +
> > +=====================================
> > +cpus and cpu node bindings definition
> > +=====================================
> > +
> > +- cpus node
> > +
> > +        Description: Container of cpu nodes
> > +
> > +        The node name must be "cpus".
> > +
> > +        A cpus node must define the following properties:
> > +
> > +        - #address-cells
> > +                Usage: required
> > +                Value type: <u32>
> > +                Definition: must be set to 1
> > +        - #size-cells
> > +                Usage: required
> > +                Value type: <u32>
> > +                Definition: must be set to 0
> > +
> > +- cpu node
> > +
> > +        Description: Describes one of SMP cores
> > +
> > +        PROPERTIES
> > +
> 
> You need a compatible property for cpu nodes.
Our cpu is defined in defconfig, not in dts. I could put a comatible
property in here, but it's no use in code.
> 
> > +        - device_type
> > +                Usage: required
> > +                Value type: <string>
> > +                Definition: must be "cpu"
> > +        - reg
> > +                Usage: required
> > +                Value type: <u32>
> > +                Definition: CPU index
> > +        - status:
> 
> You don't need to document status here.
ok, remove the status description.

Best Regards
 Guo Ren