[PATCH 7/7] arm64: dts: imx8mm-kontron: Enable backup switch mode for RTC on OSM-S module

[Frieder Schrempf <frieder@fris.de>]

From: Frieder Schrempf <frieder.schrempf@kontron.de>

The board has a battery backup supply for the RTC, but the factory
default is to have BSM disabled. Therefore the time will not be
preserved if the board is not supplied. Fix this by forcing the RTC
into BSM level mode.

Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
---
 arch/arm64/boot/dts/freescale/imx8mm-kontron-osm-s.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-kontron-osm-s.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-kontron-osm-s.dtsi
index 131f98cf5a04..5188b5b718a0 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-kontron-osm-s.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mm-kontron-osm-s.dtsi
@@ -4,6 +4,7 @@
  */
 
 #include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/rtc/rtc.h>
 #include "imx8mm.dtsi"
 
 / {
@@ -206,6 +207,7 @@ rtc@52 {
 		pinctrl-names = "default";
 		pinctrl-0 = <&pinctrl_rtc>;
 		interrupts-extended = <&gpio4 1 IRQ_TYPE_LEVEL_HIGH>;
+		backup-switch-mode = <RTC_BSM_LEVEL>;
 	};
 };
 
-- 
2.39.1