linux-kernel - [PATCH 1/4] rtc: zynqmp: correct frequency value

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Message-Id: <20251201-zynqmp-rtc-updates-v1-1-33875c1e385b@vaisala.com>
Date: Mon, 01 Dec 2025 12:50:26 +0000
From: Tomas Melin <tomas.melin@...sala.com>
To: Alexandre Belloni <alexandre.belloni@...tlin.com>, 
 Michal Simek <michal.simek@....com>
Cc: linux-rtc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, Tomas Melin <tomas.melin@...sala.com>
Subject: [PATCH 1/4] rtc: zynqmp: correct frequency value

Fix calibration value in case a clock reference is provided.
The actual calibration value written into register is
frequency - 1.

Signed-off-by: Tomas Melin <tomas.melin@...sala.com>
---
 drivers/rtc/rtc-zynqmp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/rtc/rtc-zynqmp.c b/drivers/rtc/rtc-zynqmp.c
index 3baa2b481d9f2008750046005283b98a0d546c5c..856bc1678e7d31144f320ae9f75fc58c742a2a64 100644
--- a/drivers/rtc/rtc-zynqmp.c
+++ b/drivers/rtc/rtc-zynqmp.c
@@ -345,7 +345,10 @@ static int xlnx_rtc_probe(struct platform_device *pdev)
 					   &xrtcdev->freq);
 		if (ret)
 			xrtcdev->freq = RTC_CALIB_DEF;
+	} else {
+		xrtcdev->freq--;
 	}
+
 	ret = readl(xrtcdev->reg_base + RTC_CALIB_RD);
 	if (!ret)
 		writel(xrtcdev->freq, (xrtcdev->reg_base + RTC_CALIB_WR));

-- 
2.47.3