From: Tomas Melin <tomas.melin@vaisala.com>
Date: Thu, 22 Jan 2026 13:53:45 +0000 (+0000)
Subject: rtc: zynqmp: correct frequency value
X-Git-Tag: v7.0-rc1~6^2~14
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2724fb4d429cbb724dcb6fa17953040918ebe3a2;p=thirdparty%2Flinux.git

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.

Reviewed-by: Harini T <harini.t@amd.com>
Tested-by: Harini T <harini.t@amd.com>
Signed-off-by: Tomas Melin <tomas.melin@vaisala.com>
Acked-by: Michal Simek <michal.simek@amd.com>
Link: https://patch.msgid.link/20260122-zynqmp-rtc-updates-v4-1-d4edb966b499@vaisala.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---

diff --git a/drivers/rtc/rtc-zynqmp.c b/drivers/rtc/rtc-zynqmp.c
index 3baa2b481d9f..856bc1678e7d 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));