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

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Date:	Mon, 15 Feb 2016 18:52:20 +0100
From:	Heinrich Schuchardt <xypron.glpk@....de>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	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 12:16 PM, Sergei Shtylyov wrote:
> Hello.
> 
> On 2/15/2016 8:26 AM, 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”;
> 
> MBR, Sergei
> 
> 

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.

Best regards

Heinrich Schuchardt