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

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Date:   Tue, 28 Aug 2018 15:14:00 -0700
From:   Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>
To:     Li Yang <leoyang.li@....com>, Rob Herring <robh@...nel.org>
Cc:     Heiko Stuebner <heiko@...ech.de>, linux-soc@...r.kernel.org,
        lkml <linux-kernel@...r.kernel.org>,
        Jon Hunter <jonathanh@...dia.com>, david.brown@...aro.org,
        thierry.reding@...il.com, Santosh Shilimkar <ssantosh@...nel.org>,
        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 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:

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