linux-kernel - [PATCH V2 02/10] arm64: dts: imx8mn-beacon: Fix RTC capacitive load

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Message-ID: <20250416010141.1785841-2-aford173@gmail.com>
Date: Tue, 15 Apr 2025 20:01:28 -0500
From: Adam Ford <aford173@...il.com>
To: linux-arm-kernel@...ts.infradead.org
Cc: aford@...conembedded.com,
	Frank.li@....com,
	Adam Ford <aford173@...il.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	devicetree@...r.kernel.org,
	imx@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH V2 02/10] arm64: dts: imx8mn-beacon: Fix RTC capacitive load

Although not noticeable when used every day, the RTC appears to drift when
left to sit over time.  This is due to the capacitive load not being
properly set. Fix RTC drift by correcting the capacitive load setting
from 7000 to 12500, which matches the actual hardware configuration.

Fixes: 36ca3c8ccb53 ("arm64: dts: imx: Add Beacon i.MX8M Nano development kit")
Signed-off-by: Adam Ford <aford173@...il.com>
---
V2:  Change commit message, no active changes.

 arch/arm64/boot/dts/freescale/imx8mn-beacon-som.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mn-beacon-som.dtsi b/arch/arm64/boot/dts/freescale/imx8mn-beacon-som.dtsi
index 2a64115eebf1..bb11590473a4 100644
--- a/arch/arm64/boot/dts/freescale/imx8mn-beacon-som.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mn-beacon-som.dtsi
@@ -242,6 +242,7 @@ eeprom@50 {
 	rtc: rtc@51 {
 		compatible = "nxp,pcf85263";
 		reg = <0x51>;
+		quartz-load-femtofarads = <12500>;
 	};
 };
 
-- 
2.48.1