linux-kernel - Re: [PATCH] soc: Convert to using %pOFn instead of device

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Date:   Tue, 28 Aug 2018 15:46:40 -0700
From:   Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>
To:     Li Yang <leoyang.li@....com>
Cc:     Rob Herring <robh@...nel.org>, Heiko Stuebner <heiko@...ech.de>,
        linux-soc@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
        Jon Hunter <jonathanh@...dia.com>,
        David Brown <david.brown@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Andy Gross <andy.gross@...aro.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        Zhao Qiang <qiang.zhao@....com>
Subject: Re: [PATCH] soc: Convert to using %pOFn instead of device_node.name

On 08/28/2018 03:29 PM, Li Yang wrote:
> On Tue, Aug 28, 2018 at 5:16 PM Tyrel Datwyler
> <tyreld@...ux.vnet.ibm.com> wrote:
>>
>> On 08/28/2018 11:48 AM, Li Yang wrote:
>>> On Mon, Aug 27, 2018 at 8:57 PM Rob Herring <robh@...nel.org> wrote:
>>>>
>>>> In preparation to remove the node name pointer from struct device_node,
>>>> convert printf users to use the %pOFn format specifier.
>>>
>>> Please forgive my ignorance, but what is this format specifier do
>>> exactly?   I cannot find anything listed in the printf specification
>>> matching this.  Is this something newly introduced?
>>>
>>> Leo
>>>
>>
>> From Documentation/core-api/printk-formats.rst:
> 
> I was trying to find it in the standard c format specifier.  :(
> Thanks a lot for the pointer.
> 

No problem. Its worth a look through. The usual integer types are at the top, but that is followed by the pointer types which the kernel provides quite a few for a variety of things.

>>
>> kobjects
>> --------
>>
>> ::
>>
>>         %pOF[fnpPcCF]
>>
>>
>> For printing kobject based structs (device nodes). Default behaviour is
>> equivalent to %pOFf.
>>
>>         - f - device node full_name
>>         - n - device node name
>>         - p - device node phandle
>>         - P - device node path spec (name + @unit)
>>         - F - device node flags
>>         - c - major compatible string
>>         - C - full compatible string
>>
>>
>> -Tyrel
>>
>