linux-kernel - Re: [PATCH 1/9] arm64: dts: imx8mm-beacon: Fix RTC capacitive load

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Message-ID: <Z/fqn+847WMMfKf2@lizhi-Precision-Tower-5810>
Date: Thu, 10 Apr 2025 11:58:23 -0400
From: Frank Li <Frank.li@....com>
To: Adam Ford <aford173@...il.com>
Cc: linux-arm-kernel@...ts.infradead.org, aford@...conembedded.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: Re: [PATCH 1/9] arm64: dts: imx8mm-beacon: Fix RTC capacitive load

On Wed, Apr 09, 2025 at 07:58:55PM -0500, Adam Ford wrote:
> 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.


"Fix RTC drift by correcting the capacitive load setting from 7000 to 12500,
which matches the actual hardware configuration."

should be enough.

Frank

>
> Fixes: 593816fa2f35 ("arm64: dts: imx: Add Beacon i.MX8m-Mini development kit")
> Signed-off-by: Adam Ford <aford173@...il.com>
> ---
>  arch/arm64/boot/dts/freescale/imx8mm-beacon-som.dtsi | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-beacon-som.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-beacon-som.dtsi
> index 62ed64663f49..9ba0cb89fa24 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm-beacon-som.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-beacon-som.dtsi
> @@ -233,6 +233,7 @@ eeprom@50 {
>  	rtc: rtc@51 {
>  		compatible = "nxp,pcf85263";
>  		reg = <0x51>;
> +		quartz-load-femtofarads = <12500>;
>  	};
>  };
>
> --
> 2.48.1
>