From mboxrd@z Thu Jan  1 00:00:00 1970
From: richardcochran@gmail.com (Richard Cochran)
Date: Tue, 6 Jun 2017 20:36:32 +0200
Subject: [PATCH v2 4/4] net: macb: Add hardware PTP support
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To: linux-arm-kernel@lists.infradead.org
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On Tue, Jun 06, 2017 at 08:54:50AM +0000, Rafal Ozieblo wrote:
> Would "ENOTSUP" be sufficient ?

You mean EOPNOTSUPP?  Yes, sounds ok to me.  EFAULT is surely wrong.

Thanks,
Richard