netdev - Re: [PATCH net-next 1/1] ptp: gianfar: Use high resolution frequency method.

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Date:   Wed, 23 Nov 2016 21:23:43 +0100
From:   Richard Cochran <richardcochran@...il.com>
To:     Ulrik De Bie <ulrik.debie-os@...ig.org>
Cc:     netdev@...r.kernel.org, David Miller <davem@...emloft.net>
Subject: Re: [PATCH net-next 1/1] ptp: gianfar: Use high resolution frequency
 method.

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@...ig.org>

Acked-by: Richard Cochran <richardcochran@...il.com>