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

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Message-ID: <CACxGe6ugLyV50gKCe83wCL0=qy+oHeExf9murW+qFuoVQ_TzsA@mail.gmail.com>
Date:	Wed, 3 Dec 2014 21:45:59 +0000
From:	Grant Likely <grant.likely@...aro.org>
To:	Frank Rowand <frowand.list@...il.com>
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 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.
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