arm64: dts: imx8mn-beacon-som: Configure RTC aliases

On the i.MX8MN 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. Signed-off-by: Adam Ford <[email protected]> Reviewed-by: Krzysztof Kozlowski <[email protected]> Signed-off-by: Shawn Guo <[email protected]>
vieko · Jan 18, 2021 · 18b9de7 · 18b9de7
1 parent e8d08d8
commit 18b9de7
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/arch/arm64/boot/dts/freescale/imx8mn-beacon-som.dtsi b/arch/arm64/boot/dts/freescale/imx8mn-beacon-som.dtsi
@@ -4,6 +4,11 @@
  */
 
 / {
+	aliases {
+		rtc0 = &rtc;
+		rtc1 = &snvs_rtc;
+	};
+
 	usdhc1_pwrseq: usdhc1_pwrseq {
 		compatible = "mmc-pwrseq-simple";
 		pinctrl-names = "default";
@@ -212,7 +217,7 @@
 		reg = <0x50>;
 	};
 
-	rtc@51 {
+	rtc: rtc@51 {
 		compatible = "nxp,pcf85263";
 		reg = <0x51>;
 	};