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

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

[Marcin Niestroj]

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-z3quKL4iOrmQ6ZAhV5LmOA@public.gmane.org>
---
 arch/arm/boot/dts/am335x-chilisom.dtsi | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm/boot/dts/am335x-chilisom.dtsi b/arch/arm/boot/dts/am335x-chilisom.dtsi
index f9ee585..1b43ebd 100644
--- a/arch/arm/boot/dts/am335x-chilisom.dtsi
+++ b/arch/arm/boot/dts/am335x-chilisom.dtsi
@@ -124,6 +124,14 @@
 
 &rtc {
 	system-power-controller;
+
+	pinctrl-0 = <&ext_wakeup>;
+	pinctrl-names = "default";
+
+	ext_wakeup: ext-wakeup {
+		pins = "ext_wakeup0";
+		input-enable;
+	};
 };
 
 /* NAND Flash */
-- 
2.10.2

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Re: [PATCH] ARM: dts: am335x-chilisom: Wakeup from RTC-only state by power on event

[Tony Lindgren]

* Marcin Niestroj <m.niestroj-z3quKL4iOrmQ6ZAhV5LmOA@public.gmane.org> [161209 03:33]:
> 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.

Applying into omap-for-v4.11/dt thanks.

Tony
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