linux-kernel - [PATCH for 4.9 17/59] ARM: dts: am335x-chilisom: Wakeup from RTC-only state by power on event

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Message-ID: <20170914155051.8289-17-alexander.levin@verizon.com>
Date:   Thu, 14 Sep 2017 15:51:10 +0000
From:   "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Marcin Niestroj <m.niestroj@...nn-global.com>,
        Tony Lindgren <tony@...mide.com>,
        "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com>
Subject: [PATCH for 4.9 17/59] ARM: dts: am335x-chilisom: Wakeup from RTC-only
 state by power on event

From: Marcin Niestroj <m.niestroj@...nn-global.com>

[ Upstream commit ca244a83ecc7f0a9242ee2116e622cb6d7ec2a90 ]

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@...nn-global.com>
Signed-off-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 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 f9ee5859c154..1b43ebd08b38 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 */
-- 
2.11.0