linux-kernel - Re: [PATCH V3] net: emac: emac gigabit ethernet controller driver

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Message-ID: <CAL_JsqKWXnULfWkkvukWEzBBTG8JP+HKVg6WWejWcOA=p24tvQ@mail.gmail.com>
Date:	Sat, 30 Jan 2016 15:58:29 -0600
From:	Rob Herring <robh@...nel.org>
To:	Timur Tabi <timur@...eaurora.org>
Cc:	Gilad Avidov <gavidov@...eaurora.org>,
	netdev <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	linux-arm-msm <linux-arm-msm@...r.kernel.org>,
	Sagar Dharia <sdharia@...eaurora.org>, shankerd@...eaurora.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	vikrams@...eaurora.org, Christopher Covington <cov@...eaurora.org>
Subject: Re: [PATCH V3] net: emac: emac gigabit ethernet controller driver

On Fri, Jan 29, 2016 at 2:38 PM, Timur Tabi <timur@...eaurora.org> wrote:
> Rob Herring wrote:

[...]

>>>> Isn't this a user enabled feature if the h/w supports it?
>>>
>>>
>>>
>>> Is there a sysfs entry for that?  We were planning on having a similar
>>> ACPI
>>> property.
>>
>>
>> It would be in ethtool I think.
>
>
> Ah, this driver does not support ethtool yet.
>
> However, based on a cursory look of ethtool, it appears that there's only an
> option to query the current timestamp, but not actually enable/disable the
> feature.  The e1000e driver, for example, just forces the feature by default
> for various chips.  Is there any reason why we shouldn't enable it if the
> hardware supports it?

Probably not. You simply ignore the timestamp if you don't care. So
then why do you want a DT property?

Rob