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From:   Greentime Hu <green.hu@gmail.com>
Date:   Fri, 19 Jan 2018 23:18:30 +0800
Message-ID: <CAEbi=3eexCyrVhFZB8wmK1fT=QONzc63y6=dGNgj_H+Rt4zo_g@mail.gmail.com>
Subject: Re: [PATCH v6 31/36] dt-bindings: nds32 CPU Bindings
To:     Arnd Bergmann <arnd@arndb.de>
Cc:     Greentime <greentime@andestech.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-arch <linux-arch@vger.kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Jason Cooper <jason@lakedaemon.net>,
        Marc Zyngier <marc.zyngier@arm.com>,
        Rob Herring <robh+dt@kernel.org>,
        Networking <netdev@vger.kernel.org>,
        Vincent Chen <deanbo422@gmail.com>,
        DTML <devicetree@vger.kernel.org>,
        Al Viro <viro@zeniv.linux.org.uk>,
        David Howells <dhowells@redhat.com>,
        Will Deacon <will.deacon@arm.com>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        linux-serial@vger.kernel.org,
        Geert Uytterhoeven <geert.uytterhoeven@gmail.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        Mark Rutland <mark.rutland@arm.com>, Greg KH <greg@kroah.com>,
        Guo Ren <ren_guo@c-sky.com>,
        Randy Dunlap <rdunlap@infradead.org>,
        David Miller <davem@davemloft.net>,
        Jonas Bonn <jonas@southpole.se>,
        Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>,
        Stafford Horne <shorne@gmail.com>,
        Vincent Chen <vincentc@andestech.com>,
        Rick Chen <rick@andestech.com>, Zong Li <zong@andestech.com>
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2018-01-19 22:52 GMT+08:00 Arnd Bergmann <arnd@arndb.de>:
> On Fri, Jan 19, 2018 at 3:32 PM, Greentime Hu <green.hu@gmail.com> wrote:
>> 2018-01-18 19:02 GMT+08:00 Arnd Bergmann <arnd@arndb.de>:
>>> On Mon, Jan 15, 2018 at 6:53 AM, Greentime Hu <green.hu@gmail.com> wrote:
>>>> From: Greentime Hu <greentime@andestech.com>
>>>>
>>>> This patch adds nds32 CPU binding documents.
>>>>
>>>> Signed-off-by: Vincent Chen <vincentc@andestech.com>
>>>> Signed-off-by: Rick Chen <rick@andestech.com>
>>>> Signed-off-by: Zong Li <zong@andestech.com>
>>>> Signed-off-by: Greentime Hu <greentime@andestech.com>
>>>> Reviewed-by: Rob Herring <robh@kernel.org>
>>>> ---
>>>>  Documentation/devicetree/bindings/nds32/cpus.txt |   37 ++++++++++++++++++++++
>>>>  1 file changed, 37 insertions(+)
>>>>  create mode 100644 Documentation/devicetree/bindings/nds32/cpus.txt
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/nds32/cpus.txt b/Documentation/devicetree/bindings/nds32/cpus.txt
>>>> new file mode 100644
>>>> index 0000000..9a52937
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/nds32/cpus.txt
>>>> @@ -0,0 +1,37 @@
>>>> +* Andestech Processor Binding
>>>> +
>>>> +This binding specifies what properties must be available in the device tree
>>>> +representation of a Andestech Processor Core, which is the root node in the
>>>> +tree.
>>>> +
>>>> +Required properties:
>>>> +
>>>> +       - compatible:
>>>> +               Usage: required
>>>> +               Value type: <string>
>>>> +               Definition: should be one of:
>>>> +                       "andestech,n13"
>>>> +                       "andestech,n15"
>>>> +                       "andestech,d15"
>>>> +                       "andestech,n10"
>>>> +                       "andestech,d10"
>>>> +                       "andestech,nds32v3"
>>>
>>> Based on https://lkml.org/lkml/2017/11/27/1290, this should say that
>>> the device tree should always list 'andestech,nds32v3' as the most
>>> generic 'compatible' value and list exactly one of the others in
>>> addition.
>
>> I will remove the others and just left "andestech,nds32v3" in here.
>
> No, is not what we want here, the CPU node should list exactly which core
> is used, what we need in the description is a clarification that
> andestech,nds32v3 must be used in addition to the more specific
> string.

Hi, Arnd:

Sorry I still don't get your point. Do you mean we should always use
compatible = "andestech,n13", "andestech,nds32v3";
instead of
compatible = "andestech,n13";

And I need to add the description in this document.