linux-kernel - Re: [PATCH 1/1] MIPS: DTS: cavium-octeon: provide model attribute

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Date:	Mon, 15 Feb 2016 21:11:58 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Heinrich Schuchardt <xypron.glpk@....de>,
	Arnd Bergmann <arnd@...db.de>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Andrew Bresticker <abrestic@...omium.org>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	devicetree@...r.kernel.org, linux-mips@...ux-mips.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] MIPS: DTS: cavium-octeon: provide model attribute

On 02/15/2016 08:52 PM, Heinrich Schuchardt wrote:

>>> Downstream packages like Debian flash-kernel rely on
>>> /proc/device-tree/model
>>> to determine how to install an updated kernel image.
>>>
>>> Most dts files provide this property.
>>> It is suggested by IEEE Std 1275-1994.
>>>
>>> This patch adds a model attribute for Octeon CPUs.
>>>
>>> Signed-off-by: Heinrich Schuchardt <xypron.glpk@....de>
>>> ---
>>>    arch/mips/boot/dts/cavium-octeon/octeon_3xxx.dts | 1 +
>>>    arch/mips/boot/dts/cavium-octeon/octeon_68xx.dts | 1 +
>>>    2 files changed, 2 insertions(+)
>>>
>>> diff --git a/arch/mips/boot/dts/cavium-octeon/octeon_3xxx.dts
>>> b/arch/mips/boot/dts/cavium-octeon/octeon_3xxx.dts
>>> index 9c48e05..a746678 100644
>>> --- a/arch/mips/boot/dts/cavium-octeon/octeon_3xxx.dts
>>> +++ b/arch/mips/boot/dts/cavium-octeon/octeon_3xxx.dts
>>> @@ -8,6 +8,7 @@
>>>     */
>>>    / {
>>>        compatible = "cavium,octeon-3860";
>>> +    model = "Cavium Octeon 3XXX";
>>>        #address-cells = <2>;
>>>        #size-cells = <2>;
>>>        interrupt-parent = <&ciu>;
>>> diff --git a/arch/mips/boot/dts/cavium-octeon/octeon_68xx.dts
>>> b/arch/mips/boot/dts/cavium-octeon/octeon_68xx.dts
>>> index 79b46fc..c8a292a 100644
>>> --- a/arch/mips/boot/dts/cavium-octeon/octeon_68xx.dts
>>> +++ b/arch/mips/boot/dts/cavium-octeon/octeon_68xx.dts
>>> @@ -8,6 +8,7 @@
>>>     */
>>>    / {
>>>        compatible = "cavium,octeon-6880";
>>> +    model = "Cavium Octeon 68XX";
>>>        #address-cells = <2>;
>>>        #size-cells = <2>;
>>>        interrupt-parent = <&ciu2>;
>>
>>      The ePAPR 1.1 standard says:
>>
>> 2.3.2 model
>>
>> Property: model
>> Value type: <string>
>> Description:
>>      The model property value is a <string> that specifies the
>>       manufacturer’s model number of the device.
>>
>>      The recommended format is: “manufacturer,model”, where manufacturer
>>      is a string describing the name of the manufacturer (such as a stock
>>      ticker symbol), and model specifies the model number.
>>
>> Example:
>>      model = “fsl,MPC8349EMITX”;
[...]

> Hello Sergei, hello Arnd,
>
> thank you for reviewing.
>
> IEEE Std 1275-1994 says stock symbols should be in upper case.
>
> I guess international standards should have precedence over papers valid
> for a single architecture (power.org).
>
> Would you support a patch having the following strings?
>
> model = "CAVM, Octeon 3860";
> model = "CAVM, Octeon 6880";
>
> Otherwise, please, make a suggestion.

    Documentation/devicetree/bindings/vendor-prefixes.txt already has the 
vendor prefix for Cavium, and it's (surprise!) "cavium".
    Otherwise, the names look much better -- just remove space after comma please.

> Best regards
>
> Heinrich Schuchardt

MBR, Sergei