raspberrypi: added a cpu frequency startup script

board/raspberrypi/overlay/etc/init.d/S05cpufreq

@@ -0,0 +1,36 @@
+#!/bin/bash
+
+test -n "$os_version" || source /etc/init.d/base
+
+gov="ondemand"
+cpufreqdir="/sys/devices/system/cpu/cpu0/cpufreq"
+govdir="/sys/devices/system/cpu/cpufreq/$gov"
+
+configure() {
+    echo $gov > $cpufreqdir/scaling_governor
+    if [ $gov == "ondemand" ]; then
+        echo 50 > $govdir/up_threshold
+        echo 100000 > $govdir/sampling_rate
+        echo 50 > $govdir/sampling_down_factor
+        echo 1 > $govdir/io_is_busy
+    fi
+}
+
+case "$1" in
+    start)
+        msg_begin "Configuring CPU Frequency"
+        configure
+        test $? == 0 && msg_done || msg_fail
+        ;;
+
+    stop)
+        true
+        ;;
+
+    *)
+        echo $"Usage: $0 {start}"
+        exit 1
+esac
+
+exit $?
+

board/raspberrypi2/overlay/etc/init.d/S05cpufreq

@@ -0,0 +1,36 @@
+#!/bin/bash
+
+test -n "$os_version" || source /etc/init.d/base
+
+gov="ondemand"
+cpufreqdir="/sys/devices/system/cpu/cpu0/cpufreq"
+govdir="/sys/devices/system/cpu/cpufreq/$gov"
+
+configure() {
+    echo $gov > $cpufreqdir/scaling_governor
+    if [ $gov == "ondemand" ]; then
+        echo 50 > $govdir/up_threshold
+        echo 100000 > $govdir/sampling_rate
+        echo 50 > $govdir/sampling_down_factor
+        echo 1 > $govdir/io_is_busy
+    fi
+}
+
+case "$1" in
+    start)
+        msg_begin "Configuring CPU Frequency"
+        configure
+        test $? == 0 && msg_done || msg_fail
+        ;;
+
+    stop)
+        true
+        ;;
+
+    *)
+        echo $"Usage: $0 {start}"
+        exit 1
+esac
+
+exit $?
+

board/raspberrypi2/overlay/etc/init.d/S11brownout

@@ -1,16 +1,12 @@
 #!/bin/bash
 
-gpio=35
 check_interval=30
-export=/sys/class/gpio/export
+readv=/sys/class/leds/led1/brightness
-readv=/sys/class/gpio/gpio$gpio/value
+
+test -e "$readv" || exit 0
 
 test -n "$os_version" || source /etc/init.d/base
 
-configure() {
-    echo $gpio > $export
-}
-
 watch() {
     while true; do
         if [ "$(cat $readv)" == "0" ]; then
@@ -23,9 +19,8 @@ watch() {
 case "$1" in
     start)
         msg_begin "Starting brownout detector"
-        configure
-        test $? == 0 && msg_done || msg_fail
         watch &
+        test $? == 0 && msg_done || msg_fail
         ;;
 
     stop)

board/raspberrypi3/overlay/etc/init.d/S05cpufreq

@@ -0,0 +1,36 @@
+#!/bin/bash
+
+test -n "$os_version" || source /etc/init.d/base
+
+gov="ondemand"
+cpufreqdir="/sys/devices/system/cpu/cpu0/cpufreq"
+govdir="/sys/devices/system/cpu/cpufreq/$gov"
+
+configure() {
+    echo $gov > $cpufreqdir/scaling_governor
+    if [ $gov == "ondemand" ]; then
+        echo 50 > $govdir/up_threshold
+        echo 100000 > $govdir/sampling_rate
+        echo 50 > $govdir/sampling_down_factor
+        echo 1 > $govdir/io_is_busy
+    fi
+}
+
+case "$1" in
+    start)
+        msg_begin "Configuring CPU Frequency"
+        configure
+        test $? == 0 && msg_done || msg_fail
+        ;;
+
+    stop)
+        true
+        ;;
+
+    *)
+        echo $"Usage: $0 {start}"
+        exit 1
+esac
+
+exit $?
+

board/raspberrypi3/overlay/etc/init.d/S11brownout

@@ -1,16 +1,12 @@
 #!/bin/bash
 
-gpio=35
 check_interval=30
-export=/sys/class/gpio/export
+readv=/sys/class/leds/led1/brightness
-readv=/sys/class/gpio/gpio$gpio/value
+
+test -e "$readv" || exit 0
 
 test -n "$os_version" || source /etc/init.d/base
 
-configure() {
-    echo $gpio > $export
-}
-
 watch() {
     while true; do
         if [ "$(cat $readv)" == "0" ]; then
@@ -23,9 +19,8 @@ watch() {
 case "$1" in
     start)
         msg_begin "Starting brownout detector"
-        configure
-        test $? == 0 && msg_done || msg_fail
         watch &
+        test $? == 0 && msg_done || msg_fail
         ;;
 
     stop)