linux-kernel - [PATCH v1 0/1] rtc: zynqmp: ensure correct RTC calibration

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Message-Id: <20250804154750.28249-1-l.rubusch@gmail.com>
Date: Mon,  4 Aug 2025 15:47:49 +0000
From: Lothar Rubusch <l.rubusch@...il.com>
To: alexandre.belloni@...tlin.com,
	michal.simek@....com,
	srinivas.neeli@...inx.com
Cc: linux-rtc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	l.rubusch@...il.com
Subject: [PATCH v1 0/1] rtc: zynqmp: ensure correct RTC calibration

We've observed intermittent failures with the current implementation on our
Xilinx hardware. These issues were not present prior to the commit
referenced by the Fixes tag, using the same hardware setup. The problem
appears to be identical to the one described here:
https://adaptivesupport.amd.com/s/article/000036886?language=en_US

Instead of explicitly writing 0x7FFF to the calibration register using
devmem, the patch now resets the register.

Ivan Vera (1):  rtc: zynqmp: ensure correct RTC calibration

 drivers/rtc/rtc-zynqmp.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

base-commit: 260f6f4fda93c8485c8037865c941b42b9cba5d2
-- 
2.39.5