ARM: dts: am335x-chilisom: Wakeup from RTC-only state by power on event

On chiliSOM TPS65217 nWAKEUP pin is connected to AM335x internal RTC
EXT_WAKEUP input. In RTC-only state TPS65217 is notifying about power on
events (such as power buton presses) by setting nWAKEUP output
low. After that it waits 5s for proper device boot. Currently it doesn't
happen, as the processor doesn't listen for such events. Consequently
TPS65217 changes state from SLEEP (RTC-only state) to OFF.

Enable EXT_WAKEUP input of AM335x's RTC, so the processor can properly
detect power on events and recover immediately from RTC-only states,
without powering off RTC and losing time.

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/arch/arm/boot/dts/am335x-chilisom.dtsi b/arch/arm/boot/dts/am335x-chilisom.dtsi
index f9ee5859c154ade0b5858ad97373277389b2b31a..1b43ebd08b38106a92ccc088998ef9f3cf51bab7 100644 (file)
--- a/arch/arm/boot/dts/am335x-chilisom.dtsi
+++ b/arch/arm/boot/dts/am335x-chilisom.dtsi
@@ -124,6 +124,14 @@ ldo4_reg: regulator@6 {
 
 &rtc {
        system-power-controller;
+
+       pinctrl-0 = <&ext_wakeup>;
+       pinctrl-names = "default";
+
+       ext_wakeup: ext-wakeup {
+               pins = "ext_wakeup0";
+               input-enable;
+       };
 };
 
 /* NAND Flash */