linux-kernel - [PATCH 3/9] arm64: dts: imx8mp-beacon: Fix RTC capacitive load

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Message-ID: <20250410005912.118732-3-aford173@gmail.com>
Date: Wed,  9 Apr 2025 19:58:57 -0500
From: Adam Ford <aford173@...il.com>
To: linux-arm-kernel@...ts.infradead.org
Cc: aford@...conembedded.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 3/9] arm64: dts: imx8mp-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
default being 7000, when the hardware is really using 12500.
Fixing this setting to fix the drift.

Fixes: 25a5ccdce767 ("arm64: dts: freescale: Introduce imx8mp-beacon-kit")
Signed-off-by: Adam Ford <aford173@...il.com>
---
 arch/arm64/boot/dts/freescale/imx8mp-beacon-som.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mp-beacon-som.dtsi b/arch/arm64/boot/dts/freescale/imx8mp-beacon-som.dtsi
index 15f7ab58db36..88561df70d03 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp-beacon-som.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mp-beacon-som.dtsi
@@ -257,6 +257,7 @@ eeprom@50 {
 	rtc: rtc@51 {
 		compatible = "nxp,pcf85263";
 		reg = <0x51>;
+		quartz-load-femtofarads = <12500>;
 	};
 };
 
-- 
2.48.1