Commit 2a339523 authored Jan 18, 2024 by Josua Mayer Committed by Shawn Guo Feb 05, 2024

ARM: dts: imx6qdl-hummingboard: Add rtc0 and rtc1 aliases to fix hctosys



HummingBoard has two RTCs, first integrated within SoC that can be used to
wake up from sleep - and a second on the carrier board including back-up
battery which is intended for keeping time during power-off.

Add aliases for both, ensuring that the battery-backed clock is primary
rtc and used by default during boot for restoring system time.

Fixes keeping time across power-cycle observed on Debian,
which sets RTC_HCTOSYS_DEVICE="rtc0".

Signed-off-by: Josua Mayer <josua@solid-run.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

parent 8458002b

arch/arm/boot/dts/nxp/imx/imx6qdl-hummingboard.dtsi

+6 −1

Original line number	Diff line number	Diff line
		@@ -41,6 +41,11 @@
		#include <dt-bindings/sound/fsl-imx-audmux.h>

		/ {
		aliases {
		rtc0 = &carrier_rtc;
		rtc1 = &snvs_rtc;
		};

		/* Will be filled by the bootloader */
		memory@10000000 {
		device_type = "memory";
		@@ -187,7 +192,7 @@ &i2c1 {
		status = "okay";

		/* Pro baseboard model */
		rtc@68 {
		carrier_rtc: rtc@68 {
		compatible = "nxp,pcf8523";
		reg = <0x68>;
		};

arch/arm/boot/dts/nxp/imx/imx6qdl-hummingboard2.dtsi

+5 −0

Original line number	Diff line number	Diff line
		@@ -41,6 +41,11 @@
		#include <dt-bindings/sound/fsl-imx-audmux.h>

		/ {
		aliases {
		rtc0 = &pcf8523;
		rtc1 = &snvs_rtc;
		};

		/* Will be filled by the bootloader */
		memory@10000000 {
		device_type = "memory";