From: Richard Cochran <richardcochran@gmail.com>
To: Ulrik De Bie <ulrik.debie-os@e2big.org>
Cc: netdev@vger.kernel.org, David Miller <davem@davemloft.net>
Subject: Re: [PATCH net-next 1/1] ptp: gianfar: Use high resolution frequency method.
Date: Wed, 23 Nov 2016 21:23:43 +0100 [thread overview]
Message-ID: <20161123202343.GA2845@localhost.localdomain> (raw)
In-Reply-To: <20161123201104.9706-1-ulrik.debie-os@e2big.org>
On Wed, Nov 23, 2016 at 09:11:04PM +0100, Ulrik De Bie wrote:
> This patch depends on commit d8d263541913 ("ptp: Introduce a high
> resolution frequency adjustment method.")
>
> The gianfar devices offer a frequency resolution of about 0.46 ppb
> (depends on actual value of tmr_add, for the calculation assumed
> 0x80000000). This patch lets users of the device benefit from the increased
> frequency resolution when tuning the clock. Thanks to the rounding the
> maximum error between the requested frequency and the applied frequency
> will then be about 0.23 ppb.
>
> Tested on a v3.3.8 kernel on a real gianfar device. Verified compilation
> on net-next (currently at v4.9-rc5).
>
> Signed-off-by: Ulrik De Bie <ulrik.debie-os@e2big.org>
Acked-by: Richard Cochran <richardcochran@gmail.com>
next prev parent reply other threads:[~2016-11-23 20:23 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-23 20:11 [PATCH net-next 1/1] ptp: gianfar: Use high resolution frequency method Ulrik De Bie
2016-11-23 20:23 ` Richard Cochran [this message]
2016-11-27 20:27 ` David Miller
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