linux-kernel - Re: [PATCH v4 4/4] Documentation: ABI: /sys/firmware/devicetree/overlays

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Message-ID: <CAL_JsqLQ2fU1KgN=KprLJmGeJjGxcfX9CZfRpWwd-BUYr7g5qw@mail.gmail.com>
Date:	Mon, 15 Jun 2015 08:42:57 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Pantelis Antoniou <pantelis.antoniou@...sulko.com>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Matt Porter <mporter@...sulko.com>,
	Koen Kooi <koen@...inion.thruhere.net>,
	Guenter Roeck <linux@...ck-us.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-api@...r.kernel.org" <linux-api@...r.kernel.org>
Subject: Re: [PATCH v4 4/4] Documentation: ABI: /sys/firmware/devicetree/overlays

On Mon, Jun 15, 2015 at 8:26 AM, Pantelis Antoniou
<pantelis.antoniou@...sulko.com> wrote:
> Hi Rob,
>
>> On Jun 15, 2015, at 16:24 , Rob Herring <robherring2@...il.com> wrote:
>>
>> On Fri, Jun 12, 2015 at 2:38 PM, Pantelis Antoniou
>> <pantelis.antoniou@...sulko.com> wrote:
>>> Documentation ABI entry for overlays sysfs entries.
>>>
>>> Signed-off-by: Pantelis Antoniou <pantelis.antoniou@...sulko.com>
>>> ---
>>> .../ABI/testing/sysfs-firmware-devicetree-overlays | 35 ++++++++++++++++++++++
>>> 1 file changed, 35 insertions(+)
>>> create mode 100644 Documentation/ABI/testing/sysfs-firmware-devicetree-overlays
>>>
>>> diff --git a/Documentation/ABI/testing/sysfs-firmware-devicetree-overlays b/Documentation/ABI/testing/sysfs-firmware-devicetree-overlays
>>> new file mode 100644
>>> index 0000000..be2d28b
>>> --- /dev/null
>>> +++ b/Documentation/ABI/testing/sysfs-firmware-devicetree-overlays
>>> @@ -0,0 +1,35 @@

[...]

>>> +
>>> +               targets: A file containing the list of targets of each overlay
>>> +                        with each line containing a target.
>>
>> We have OF nodes in sysfs now. Would it be more useful if we created
>> links to the target nodes instead of having a list of names?
>>
>
> Probably, this interface is merely informational; things get complicated by
> the fact that there can be more than one target in each overlay.

Right, you would need 'targetN' or perhaps '<node name>' (with a '.N'
for duplicates) as the link names.

If it is informational, then perhaps debugfs should be used instead?

What else if anything do you envision adding here?

Rob
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