linux-kernel - Re: [PATCH] of: Custom printk format specifier for device node

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Date:	Tue, 20 Jan 2015 16:05:54 +0000
From:	Måns Rullgård <mans@...sr.com>
To:	Pantelis Antoniou <pantelis.antoniou@...sulko.com>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Rob Herring <robherring2@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Randy Dunlap <rdunlap@...radead.org>,
	"linux-doc\@vger.kernel.org" <linux-doc@...r.kernel.org>,
	"devicetree\@vger.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] of: Custom printk format specifier for device node

Pantelis Antoniou <pantelis.antoniou@...sulko.com> writes:

> Hi Geert,
>
>> On Jan 20, 2015, at 17:24 , Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>> 
>> On Tue, Jan 20, 2015 at 3:47 PM, Rob Herring <robherring2@...il.com> wrote:
>>>> +       Examples:
>>>> +
>>>> +       %pO     /foo/bar@0              - Node full name
>>>> +       %pO0    /foo/bar@0              - Same as above
>>>> +       %pO1    /foo/bar@0[10]          - Node full name + phandle
>>>> +       %pO2    /foo/bar@0[10:DdPB]     - Node full name + phandle + node flags
>>>> +                                        D - dynamic
>>>> +                                        d - detached
>>>> +                                        P - Populated
>>>> +                                        B - Populated bus
>>> 
>>> We should think about what else we want to print for a node. Perhaps
>>> 'On' for name, 'Oc' for compatible, etc.
>> 
>> I was just going to say "The least verbose variant is name, not full_name”.
>> 
>
> Unfortunately in the context of device tree nodes ‘name' is usually
> not what you want to print to identify the node in question. ‘name’ is
> usually not unique.

Name and address without the full path is usually a good compromise
between uniqueness (it is usually unique for memory-mapped things) and
verbosity.

-- 
Måns Rullgård
mans@...sr.com
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