netdev - [PATCH net-next 0/2] ptp: ptp_clockmatrix: Fix output 1 PPS alignment.

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Message-ID: <1613104725-22056-1-git-send-email-vincent.cheng.xh@renesas.com>
Date:   Thu, 11 Feb 2021 23:38:43 -0500
From:   <vincent.cheng.xh@...esas.com>
To:     <richardcochran@...il.com>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Vincent Cheng <vincent.cheng.xh@...esas.com>
Subject: [PATCH net-next 0/2] ptp: ptp_clockmatrix: Fix output 1 PPS alignment.

From: Vincent Cheng <vincent.cheng.xh@...esas.com>

This series fixes a race condition that may result in the output clock
not aligned to internal 1 PPS clock.

Part of device initialization is to align the rising edge of output
clocks to the internal rising edge of the 1 PPS clock.  If the system
APLL and DPLL are not locked when this alignment occurs, the alignment
fails and a fixed offset between the internal 1 PPS clock and the
output clock occurs.

If a clock is dynamically enabled after power-up, the output clock
also needs to be aligned to the internal 1 PPS clock.

Vincent Cheng (2):
  ptp: ptp_clockmatrix: Add wait_for_sys_apll_dpll_lock.
  ptp: ptp_clockmatrix: Add alignment of 1 PPS to idtcm_perout_enable.

 drivers/ptp/idt8a340_reg.h    | 10 +++++
 drivers/ptp/ptp_clockmatrix.c | 92 ++++++++++++++++++++++++++++++++++++++++---
 drivers/ptp/ptp_clockmatrix.h | 17 +++++++-
 3 files changed, 112 insertions(+), 7 deletions(-)

-- 
2.7.4