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Date: Thu, 14 Jan 2016 03:22:17 +0000 From: "Brown, Aaron F" <aaron.f.brown@...el.com> To: "Hii, Roland King Guan" <roland.king.guan.hii@...el.com>, "Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com> CC: "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: RE: [PATCH] igb: add conditions for I210 to generate periodic clock output > From: netdev-owner@...r.kernel.org [netdev-owner@...r.kernel.org] on behalf of Roland Hii [roland.king.guan.hii@...el.com] > Sent: Sunday, January 10, 2016 11:34 PM > To: Kirsher, Jeffrey T > Cc: intel-wired-lan@...ts.osuosl.org; netdev@...r.kernel.org; linux-kernel@...r.kernel.org > Subject: [PATCH] igb: add conditions for I210 to generate periodic clock output > > In general case the maximum supported half cycle time of the synchronized > output clock is 70msec. Slower half cycle time than 70msec can be > programmed also as long as the output clock is synchronized to whole > seconds, useful specifically for generating a 1Hz clock. > > Permitted values for the clock half cycle time are: 125,000,000 decimal, > 250,000,000 decimal and 500,000,000 decimal (equals to 125msec, 250msec > and 500msec respectively). > > Before this patch, only the half cycle time of less than or equal to 70msec > uses the I210 clock output function. This patch adds additional conditions > when half cycle time is equal to 125msec or 250msec or 500msec to use > clock output function. > > Under other conditions, interrupt driven target time output events method > is still used to generate the desired clock output. > > Signed-off-by: Roland Hii <roland.king.guan.hii@...el.com> > --- > drivers/net/ethernet/intel/igb/igb_ptp.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) Tested-by: Aaron Brown <aaron.f.brown@...el.com>
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