On the i.MX8MM Beacon SOM, there is an RTC chip which is fed power from the baseboard during power off. The SNVS RTC integrated into the SoC is not fed power. Depending on the order the modules are loaded, this can be a problem if the external RTC isn't rtc0. Make the alias for rtc0 point to the external RTC all the time and rtc1 point to the SVNS in order to correctly hold date/time over a power-cycle. Fixes: 593816fa2f35 ("arm64: dts: imx: Add Beacon i.MX8m-Mini development kit") Signed-off-by: Adam Ford <aford173@xxxxxxxxx> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-beacon-som.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-beacon-som.dtsi index 5565775270f9..9bdefbba9e90 100644 --- a/arch/arm64/boot/dts/freescale/imx8mm-beacon-som.dtsi +++ b/arch/arm64/boot/dts/freescale/imx8mm-beacon-som.dtsi @@ -4,6 +4,11 @@ */ / { + aliases { + rtc0 = &rtc; + rtc1 = &snvs_rtc; + }; + usdhc1_pwrseq: usdhc1_pwrseq { compatible = "mmc-pwrseq-simple"; pinctrl-names = "default"; @@ -219,7 +224,7 @@ eeprom@50 { reg = <0x50>; }; - rtc@51 { + rtc: rtc@51 { compatible = "nxp,pcf85263"; reg = <0x51>; }; -- 2.25.1