samples: subsys: Add sample app to demo OS managed PM

Add a sample application to demonstrate OS managed
Power Management framework.

Signed-off-by: Ramakrishna Pallala <ramakrishna.pallala@intel.com>

samples/subsys/power/power.rst

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+.. _power_management-samples:
+
+Power Management Samples
+########################
+
+.. toctree::
+  :maxdepth: 1
+  :glob:
+
+  **/*

samples/subsys/power/power_mgr/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.8.2)
+include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)
+project(NONE)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

samples/subsys/power/power_mgr/README.rst

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+.. _os-power-mgr-sample:
+
+OS Power management demo
+###########################
+
+Overview
+********
+
+This sample demonstrates OS managed power saving mechanism through the sample
+application which will periodically go sleep there by invoking the idle thread
+which will call the _sys_soc_suspend() to enter into low power states. The Low
+Power state will be selected based on the next timeout event.
+
+Requirements
+************
+
+This application uses nrf52 DK board for the demo.
+
+Building, Flashing and Running
+******************************
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/subsys/power/power_mgr
+   :board: nrf52_pca10040
+   :goals: build flash
+   :compact:
+
+Running:
+
+1. Open UART terminal.
+2. Power Cycle Device.
+3. Device will enter into Low Power Modes periodically.
+
+
+Sample Output
+=================
+nrf52 core output
+-----------------
+
+.. code-block:: console
+
+  ***OS Power Management Demo on arm****
+  Demo Description
+  Application creates Idleness, Due to which System Idle Thread is
+  scheduled and it enters into various Low Power States.
+
+  <-- App doing busy wait for 10 Sec -->
+
+  <-- App going to sleep for 6000 msec -->
+  Entering Low Power state (0)
+  Entering Low Power state (0)
+  Entering Low Power state (0)
+  Entering Low Power state (0)
+
+  <-- App doing busy wait for 10 Sec -->
+
+  <-- App going to sleep for 11000 msec -->
+  Entering Low Power state (1)
+  Entering Low Power state (1)
+  Entering Low Power state (1)
+  Entering Low Power state (1)
+
+  <-- App doing busy wait for 10 Sec -->
+
+  <-- App going to sleep for 6000 msec -->
+  Entering Low Power state (0)
+  Entering Low Power state (0)
+  Entering Low Power state (0)
+  Entering Low Power state (0)
+
+  <-- App doing busy wait for 10 Sec -->
+
+  <-- App going to sleep for 11000 msec -->
+  Entering Low Power state (1)
+  Entering Low Power state (1)
+  Entering Low Power state (1)
+  Entering Low Power state (1)
+  OS managed Power Management Test completed
+

samples/subsys/power/power_mgr/prj.conf

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+CONFIG_SYS_POWER_MANAGEMENT=y
+CONFIG_SYS_POWER_LOW_POWER_STATE=y
+CONFIG_SYS_POWER_DEEP_SLEEP=y
+CONFIG_DEVICE_POWER_MANAGEMENT=y
+CONFIG_TICKLESS_IDLE=y
+
+CONFIG_PM_CONTROL_OS=y
+CONFIG_PM_CONTROL_OS_LPS=y
+CONFIG_PM_LPS_MIN_RES=5
+CONFIG_PM_CONTROL_OS_LPS_1=y
+CONFIG_PM_LPS_1_MIN_RES=10
+CONFIG_PM_CONTROL_OS_DEEP_SLEEP=y
+CONFIG_PM_DEEP_SLEEP_MIN_RES=60

samples/subsys/power/power_mgr/prj_tickless.conf

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+CONFIG_NUM_COOP_PRIORITIES=29
+CONFIG_NUM_PREEMPT_PRIORITIES=40
+CONFIG_SYS_POWER_MANAGEMENT=y
+CONFIG_SYS_POWER_LOW_POWER_STATE=y
+CONFIG_SYS_POWER_DEEP_SLEEP=y
+CONFIG_DEVICE_POWER_MANAGEMENT=y
+CONFIG_TICKLESS_KERNEL=y
+CONFIG_TICKLESS_IDLE=y
+
+CONFIG_PM_CONTROL_OS=y
+CONFIG_PM_CONTROL_OS_LPS=y
+CONFIG_PM_LPS_MIN_RES=5
+CONFIG_PM_CONTROL_OS_LPS_1=y
+CONFIG_PM_LPS_1_MIN_RES=10
+CONFIG_PM_CONTROL_OS_DEEP_SLEEP=y
+CONFIG_PM_DEEP_SLEEP_MIN_RES=60

samples/subsys/power/power_mgr/sample.yaml

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+sample:
+  name: OS managed Power Management Sample
+tests:
+  ospm.low_power_state:
+    platform_whitelist: nrf52840_pca10056 nrf52_pca10040
+    tags: power

samples/subsys/power/power_mgr/src/main.c

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+/*
+ * Copyright (c) 2016 Intel Corporation.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr.h>
+#include <power.h>
+#include <soc_power.h>
+#include <misc/printk.h>
+#include <string.h>
+#include <board.h>
+#include <device.h>
+#include <gpio.h>
+
+#define SECONDS_TO_SLEEP	1
+
+#define BUSY_WAIT_DELAY_US		(10 * 1000000)
+
+#define LPS_STATE_ENTER_TO		((CONFIG_PM_LPS_MIN_RES + 1) * 1000)
+#define LPS1_STATE_ENTER_TO		((CONFIG_PM_LPS_1_MIN_RES + 1) * 1000)
+
+#define DEMO_DESCRIPTION	\
+	"Demo Description\n"	\
+	"Application creates Idleness, Due to which System Idle Thread is\n"\
+	"scheduled and it enters into various Low Power States.\n"\
+
+void sys_pm_notify_lps_entry(enum power_states state)
+{
+	printk("Entering Low Power state (%d)\n", state);
+}
+
+void sys_pm_notify_lps_exit(enum power_states state)
+{
+	printk("Entering Low Power state (%d)\n", state);
+}
+
+/* Application main Thread */
+void main(void)
+{
+	printk("\n\n***OS Power Management Demo on %s****\n", CONFIG_ARCH);
+	printk(DEMO_DESCRIPTION);
+
+	for (int i = 1; i <= 4; i++) {
+		printk("\n<-- App doing busy wait for 10 Sec -->\n");
+		k_busy_wait(BUSY_WAIT_DELAY_US);
+
+		/* Create Idleness to make Idle thread run */
+		if ((i % 2) == 0) {
+			printk("\n<-- App going to sleep for %d msec -->\n",
+							LPS1_STATE_ENTER_TO);
+			k_sleep(LPS1_STATE_ENTER_TO);
+		} else {
+			printk("\n<-- App going to sleep for %d msec -->\n",
+							LPS_STATE_ENTER_TO);
+			k_sleep(LPS_STATE_ENTER_TO);
+		}
+	}
+
+	printk("OS managed Power Management Test completed\n");
+}