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From: Arnd Bergmann <arnd@arndb.de>
Date: Fri, 10 Nov 2017 09:25:19 +0100
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Subject: Re: [PATCH 30/31] dt-bindings: nds32 CPU Bindings
To: Greentime Hu <green.hu@gmail.com>
Cc: Rob Herring <robh@kernel.org>, Rob Herring <robh+dt@kernel.org>,
        Greentime <greentime@andestech.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Jason Cooper <jason@lakedaemon.net>,
        Marc Zyngier <marc.zyngier@arm.com>, netdev <netdev@vger.kernel.org>,
        Vincent Chen <vincentc@andestech.com>, Rick Chen <rick@andestech.com>,
        Zong Li <zong@andestech.com>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>
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On Fri, Nov 10, 2017 at 7:22 AM, Greentime Hu <green.hu@gmail.com> wrote:
> 2017-11-09 21:57 GMT+08:00 Rob Herring <robh@kernel.org>:
>> On Thu, Nov 9, 2017 at 3:39 AM, Greentime Hu <green.hu@gmail.com> wrote:
>>> 2017-11-08 21:18 GMT+08:00 Rob Herring <robh+dt@kernel.org>:
>>>> Please Cc the DT list on bindings.
>>>
>>> Sorry. I am not sure what you mean.
>>> Do you mean add devicetree@vger.kernel.org to cc list?
>>
>> Yes. Use get_maintainers.pl as a guide.
>
> Roger that! Thanks!
>
>>>> On Tue, Nov 7, 2017 at 11:55 PM, Greentime Hu <green.hu@gmail.com> wrote:
>>>>> From: Greentime Hu <greentime@andestech.com>
>>>>
>>
>>>>> +                       device_type = "cpu";
>>>>> +                       compatible = "andestech,n13", "andestech,n15";
>>>>
>>>> n13 is a superset of n15?
>>>
>>> No, they are independent ones.
>>
>> Then having both is not valid. The strings should be in order of best
>> match to worst match where worst match is typically either older
>> implementations of IP blocks or generic'ish strings such as "ns16550"
>> for a UART.
>
> Thanks.
> I would like to explain it more clearly.
> They are independent ones in implementations.
> They are implemented based on the same nds32 ISA and architecture spec
> with different configurations
> like cache size, page size, cache type(VIPT/PIPT), pipeline stages...
> Most of them are compatible.
> They use the same toolchain to build vmlinux which can run on
> different nds32 cores.

Du you have a name for the ISA spec that distinguishes it from other nds32
versions that are incompatible? If you do, this could be written like

compatible = "andestech,n13", "andestech,nds32v3.0";

to signify that a an 'n13' core implements the 'v3.0' ISA (will it
whatever you call the ISA in reality).

       Arnd