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Date:   Wed, 26 Jun 2019 14:01:23 -0700 (PDT)
From:   Paul Walmsley <paul.walmsley@sifive.com>
To:     Rob Herring <robh@kernel.org>
cc:     linux-riscv@lists.infradead.org,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] dt-bindings: riscv: resolve 'make dt_binding_check'
 warnings
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On Wed, 26 Jun 2019, Paul Walmsley wrote:

> On Wed, 26 Jun 2019, Rob Herring wrote:
> 
> > On Wed, Jun 26, 2019 at 9:30 AM Paul Walmsley <paul.walmsley@sifive.com> wrote:
> > >
> > > Rob pointed out that one of the examples in the RISC-V 'cpus' YAML schema
> > > results in warnings from 'make dt_binding_check'.  Fix these.
> > >
> > > While here, make the whitespace in the second example consistent with the
> > > first example.
> > >
> > > Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
> > > Cc: Rob Herring <robh@kernel.org>
> > > ---
> > >  .../devicetree/bindings/riscv/cpus.yaml       | 26 ++++++++++---------
> > >  1 file changed, 14 insertions(+), 12 deletions(-)
> > >
> > > diff --git a/Documentation/devicetree/bindings/riscv/cpus.yaml b/Documentation/devicetree/bindings/riscv/cpus.yaml
> > > index 27f02ec4bb45..f97a4ecd7b91 100644
> > > --- a/Documentation/devicetree/bindings/riscv/cpus.yaml
> > > +++ b/Documentation/devicetree/bindings/riscv/cpus.yaml
> > > @@ -152,17 +152,19 @@ examples:
> > >    - |
> > >      // Example 2: Spike ISA Simulator with 1 Hart
> > >      cpus {
> > > -            cpu@0 {
> > > -                    device_type = "cpu";
> > > -                    reg = <0>;
> > > -                    compatible = "riscv";
> > > -                    riscv,isa = "rv64imafdc";
> > > -                    mmu-type = "riscv,sv48";
> > > -                    interrupt-controller {
> > > -                            #interrupt-cells = <1>;
> > > -                            interrupt-controller;
> > > -                            compatible = "riscv,cpu-intc";
> > > -                    };
> > > -            };
> > > +        #address-cells = <1>;
> > > +        #size-cells = <0>;
> > > +        cpu@0 {
> > 
> > This only works because you removed 'cpus' and therefore none of this
> > schema is applied.
> 
> I'm not following you - could you point out where "cpus" was removed?

If it helps, this patch is simply to fix the dtc warnings that you 
mentioned in your post on devicetree-spec@.  Without this patch, with 
"make dtbs_check", the following warnings are generated:

  DTC     Documentation/devicetree/bindings/riscv/cpus.example.dtb
Documentation/devicetree/bindings/riscv/cpus.example.dts:75.25-35: Warning (reg_format): /example-1/cpus/cpu@0:reg: property has invalid length (4 bytes) (#address-cells == 2, #size-cells == 1)
Documentation/devicetree/bindings/riscv/cpus.example.dtb: Warning (pci_device_bus_num): Failed prerequisite 'reg_format'
Documentation/devicetree/bindings/riscv/cpus.example.dtb: Warning (i2c_bus_reg): Failed prerequisite 'reg_format'
Documentation/devicetree/bindings/riscv/cpus.example.dtb: Warning (spi_bus_reg): Failed prerequisite 'reg_format'
Documentation/devicetree/bindings/riscv/cpus.example.dts:73.23-84.19: Warning (avoid_default_addr_size): /example-1/cpus/cpu@0: Relying on default #address-cells value
Documentation/devicetree/bindings/riscv/cpus.example.dts:73.23-84.19: Warning (avoid_default_addr_size): /example-1/cpus/cpu@0: Relying on default #size-cells value

When the patch is applied, dtc doesn't report any of these warnings.

Let me know if I'm missing something obvious.


- Paul