linux-kernel - Re: [PATCH 10/10] arm64: dts: imx8mp-skov: increase I2C clock frequency for RTC

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Message-ID: <Z2RcJCaYC2FW3Ks6@lizhi-Precision-Tower-5810>
Date: Thu, 19 Dec 2024 12:47:16 -0500
From: Frank Li <Frank.li@....com>
To: Ahmad Fatoum <a.fatoum@...gutronix.de>
Cc: 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>,
	Oleksij Rempel <o.rempel@...gutronix.de>,
	devicetree@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/10] arm64: dts: imx8mp-skov: increase I2C clock
 frequency for RTC

On Thu, Dec 19, 2024 at 08:25:34AM +0100, Ahmad Fatoum wrote:
> From: Oleksij Rempel <o.rempel@...gutronix.de>
>
> The NXP PCF85063TP RTC we use is capable of up to 400 kHz of SCL clock
> frequency, so let's make use of this instead of the 100 kHz bus frequency
> we are currently using.

Increase I2C frequency to 400khz from 100kHz because NXP PCF85063TP RTC
support it.

Frank

>
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> Signed-off-by: Ahmad Fatoum <a.fatoum@...gutronix.de>
> ---
>  arch/arm64/boot/dts/freescale/imx8mp-skov-reva.dtsi | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm64/boot/dts/freescale/imx8mp-skov-reva.dtsi b/arch/arm64/boot/dts/freescale/imx8mp-skov-reva.dtsi
> index a683f46fcbab..ec7857db7bf0 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mp-skov-reva.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mp-skov-reva.dtsi
> @@ -333,7 +333,7 @@ reg_nvcc_sd2: LDO5 {
>  };
>
>  &i2c3 {
> -	clock-frequency = <100000>;
> +	clock-frequency = <400000>;
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&pinctrl_i2c3>;
>  	status = "okay";
>
> --
> 2.39.5
>