linux-kernel - Re: [PATCH v3 1/3] devicetree: of: Add bindings for chosen node, stdout-path

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Date:	Wed, 03 Dec 2014 15:07:49 -0800
From:	Frank Rowand <frowand.list@...il.com>
To:	Grant Likely <grant.likely@...aro.org>
CC:	Leif Lindholm <leif.lindholm@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Mark Rutland <mark.rutland@....com>,
	Andrew Lunn <andrew@...n.ch>,
	"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
	Rob Herring <robh+dt@...nel.org>,
	Ian Campbell <ijc@...ian.org>,
	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
Subject: Re: [PATCH v3 1/3] devicetree: of: Add bindings for chosen node,
 stdout-path

On 12/3/2014 1:45 PM, Grant Likely wrote:
> On Wed, Dec 3, 2014 at 7:46 PM, Frank Rowand <frowand.list@...il.com> wrote:
>> On 12/3/2014 7:12 AM, Grant Likely wrote:
>>> On Wed, Dec 3, 2014 at 2:24 AM, Frank Rowand <frowand.list@...il.com> wrote:
>>>> On 11/27/2014 9:56 AM, Leif Lindholm wrote:
>>>>> Add a global binding for the chosen node.
>>>>> Include a description of the stdout-path, and an explicit statement on
>>>>> its extra options in the context of a UART console.
>>>>>
>>>>> Opening description stolen from www.devicetree.org, and part of the
>>>>> remaining text provided by Mark Rutland.
>>>>>
>>>>> Signed-off-by: Leif Lindholm <leif.lindholm@...aro.org>
>>>>> ---
>>>>>  Documentation/devicetree/bindings/chosen.txt |   42 ++++++++++++++++++++++++++
>>>>>  1 file changed, 42 insertions(+)
>>>>>  create mode 100644 Documentation/devicetree/bindings/chosen.txt
>>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/chosen.txt b/Documentation/devicetree/bindings/chosen.txt
>>>>> new file mode 100644
>>>>> index 0000000..9cd74e9
>>>>> --- /dev/null
>>>>> +++ b/Documentation/devicetree/bindings/chosen.txt
>>>>> @@ -0,0 +1,42 @@
>>>>> +The chosen node
>>>>> +---------------
>>>>> +
>>>>> +The chosen node does not represent a real device, but serves as a place
>>>>> +for passing data between firmware and the operating system, like boot
>>>>> +arguments. Data in the chosen node does not represent the hardware.
>>>>> +
>>>>> +
>>>>> +stdout-path property
>>>>
>>>> The code in patch 3/3 adds the extra options feature to the properties:
>>>>
>>>>   stdout-path
>>>>   linux,stdout-path
>>>>   stdout  [if (IS_ENABLED(CONFIG_PPC) ... ]
>>>
>>> I don't understand what you mean here. Are you suggesting a change to
>>> this patch? Is there something deficient in it?
>>
>> Assuming that the code change in patch 3 is as desired, then the chosen.txt
>> documentation applies to all three properties, not just stdout-path.  So
>> yes, a change is suggested for the documentation.
> 
> how about if this is added:
> 
> Implementation note: Linux will look for the property "linux,stdout-path" or
> on PowerPC "stdout" if "stdout-path" is not found.  However, the
> "linux,stdout-path" and "stdout" properties are deprecated. New platforms
> should only use the "stdout-path" property.
> 
> g.
> 

Yep, perfect.

-Frank
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