diff -Nru python-periphery-2.0.0/CHANGELOG.md python-periphery-2.0.1/CHANGELOG.md
--- python-periphery-2.0.0/CHANGELOG.md	2019-10-29 03:46:27.000000000 +0000
+++ python-periphery-2.0.1/CHANGELOG.md	2020-01-08 06:41:59.000000000 +0000
@@ -1,3 +1,10 @@
+* v2.0.1 - 01/08/2020
+    * PWM
+        * Add retry loop for opening PWM period file after export to
+          accommodate delayed udev permission rule application.
+    * Contributors
+        * Jonas Larsson, @jonasl - 28653d4
+
 * v2.0.0 - 10/28/2019
     * GPIO
         * Add support for character device GPIOs.
diff -Nru python-periphery-2.0.0/debian/changelog python-periphery-2.0.1/debian/changelog
--- python-periphery-2.0.0/debian/changelog	2019-11-13 20:56:00.000000000 +0000
+++ python-periphery-2.0.1/debian/changelog	2020-01-22 20:48:09.000000000 +0000
@@ -1,3 +1,15 @@
+python-periphery (2.0.1-1) unstable; urgency=low
+
+  [ Debian Janitor ]
+  * Set upstream metadata fields: Bug-Database, Bug-Submit, Repository,
+    Repository-Browse.
+
+  [ Michael Fladischer ]
+  * New upstream release.
+  * Set Rules-Requires-Root: no.
+
+ -- Michael Fladischer <fladi@debian.org>  Wed, 22 Jan 2020 21:48:09 +0100
+
 python-periphery (2.0.0-1) unstable; urgency=low
 
   [ Ondřej Nový ]
diff -Nru python-periphery-2.0.0/debian/control python-periphery-2.0.1/debian/control
--- python-periphery-2.0.0/debian/control	2019-11-13 20:56:00.000000000 +0000
+++ python-periphery-2.0.1/debian/control	2020-01-22 20:48:09.000000000 +0000
@@ -15,6 +15,7 @@
 Vcs-Browser: https://salsa.debian.org/python-team/modules/python-periphery
 Vcs-Git: https://salsa.debian.org/python-team/modules/python-periphery.git
 Testsuite: autopkgtest-pkg-python
+Rules-Requires-Root: no
 
 Package: python3-periphery
 Architecture: all
diff -Nru python-periphery-2.0.0/debian/upstream/metadata python-periphery-2.0.1/debian/upstream/metadata
--- python-periphery-2.0.0/debian/upstream/metadata	1970-01-01 00:00:00.000000000 +0000
+++ python-periphery-2.0.1/debian/upstream/metadata	2020-01-22 20:48:09.000000000 +0000
@@ -0,0 +1,4 @@
+Bug-Database: https://github.com/vsergeev/python-periphery/issues
+Bug-Submit: https://github.com/vsergeev/python-periphery/issues/new
+Repository: https://github.com/vsergeev/python-periphery.git
+Repository-Browse: https://github.com/vsergeev/python-periphery
diff -Nru python-periphery-2.0.0/docs/conf.py python-periphery-2.0.1/docs/conf.py
--- python-periphery-2.0.0/docs/conf.py	2019-10-29 03:46:27.000000000 +0000
+++ python-periphery-2.0.1/docs/conf.py	2020-01-08 06:41:59.000000000 +0000
@@ -21,7 +21,7 @@
 author = u'Vanya A. Sergeev'
 
 # The short X.Y version.
-version = '2.0.0'
+version = '2.0.1'
 # The full version, including alpha/beta/rc tags.
 release = version
 
diff -Nru python-periphery-2.0.0/docs/gpio.rst python-periphery-2.0.1/docs/gpio.rst
--- python-periphery-2.0.0/docs/gpio.rst	2019-10-29 03:46:27.000000000 +0000
+++ python-periphery-2.0.1/docs/gpio.rst	2020-01-08 06:41:59.000000000 +0000
@@ -8,9 +8,9 @@
 
     from periphery import GPIO
     
-    # Open GPIO /dev/gpiochip0 10 with input direction
+    # Open GPIO /dev/gpiochip0 line 10 with input direction
     gpio_in = GPIO("/dev/gpiochip0", 10, "in")
-    # Open GPIO /dev/gpiochip0 12 with output direction
+    # Open GPIO /dev/gpiochip0 line 12 with output direction
     gpio_out = GPIO("/dev/gpiochip0", 12, "out")
     
     value = gpio_in.read()
diff -Nru python-periphery-2.0.0/periphery/__init__.py python-periphery-2.0.1/periphery/__init__.py
--- python-periphery-2.0.0/periphery/__init__.py	2019-10-29 03:46:27.000000000 +0000
+++ python-periphery-2.0.1/periphery/__init__.py	2020-01-08 06:41:59.000000000 +0000
@@ -1,9 +1,9 @@
 import time
 
-__version__ = "2.0.0"
+__version__ = "2.0.1"
 "Module version string."
 
-version = (2, 0, 0)
+version = (2, 0, 1)
 "Module version tuple."
 
 
diff -Nru python-periphery-2.0.0/periphery/pwm.py python-periphery-2.0.1/periphery/pwm.py
--- python-periphery-2.0.0/periphery/pwm.py	2019-10-29 03:46:27.000000000 +0000
+++ python-periphery-2.0.1/periphery/pwm.py	2020-01-08 06:41:59.000000000 +0000
@@ -1,3 +1,4 @@
+import errno
 import os
 import time
 
@@ -78,6 +79,18 @@
             if not exported:
                 raise TimeoutError("Exporting PWM: waiting for \"{:s}\" timed out".format(channel_path))
 
+            # Loop until period is writable. This could take some time after
+            # export as application of udev rules after export is asynchronous.
+            for i in range(PWM.PWM_STAT_RETRIES):
+                try:
+                    with open(os.path.join(channel_path, "period"), 'w'):
+                        break
+                except IOError as e:
+                    if e.errno != errno.EACCES or (e.errno == errno.EACCES and i == PWM.PWM_STAT_RETRIES - 1):
+                        raise PWMError(e.errno, "Opening PWM period: " + e.strerror)
+
+                time.sleep(PWM.PWM_STAT_DELAY)
+
         self._chip = chip
         self._channel = channel
         self._path = channel_path
diff -Nru python-periphery-2.0.0/README.md python-periphery-2.0.1/README.md
--- python-periphery-2.0.0/README.md	2019-10-29 03:46:27.000000000 +0000
+++ python-periphery-2.0.1/README.md	2020-01-08 06:41:59.000000000 +0000
@@ -1,4 +1,4 @@
-# python-periphery [![Build Status](https://travis-ci.org/vsergeev/python-periphery.svg?branch=master)](https://travis-ci.org/vsergeev/python-periphery) [![GitHub release](https://img.shields.io/github/release/vsergeev/python-periphery.svg?maxAge=7200)](https://github.com/vsergeev/python-periphery) [![License](https://img.shields.io/badge/license-MIT-blue.svg)](https://github.com/vsergeev/python-periphery/blob/master/LICENSE)
+# python-periphery [![Build Status](https://travis-ci.org/vsergeev/python-periphery.svg?branch=master)](https://travis-ci.org/vsergeev/python-periphery) [![Docs Status](https://readthedocs.org/projects/python-periphery/badge/)](https://python-periphery.readthedocs.io/en/latest/) [![GitHub release](https://img.shields.io/github/release/vsergeev/python-periphery.svg?maxAge=7200)](https://github.com/vsergeev/python-periphery) [![License](https://img.shields.io/badge/license-MIT-blue.svg)](https://github.com/vsergeev/python-periphery/blob/master/LICENSE)
 
 ## Linux Peripheral I/O (GPIO, LED, PWM, SPI, I2C, MMIO, Serial) with Python 2 & 3
 
@@ -32,9 +32,9 @@
 ``` python
 from periphery import GPIO
 
-# Open GPIO /dev/gpiochip0 10 with input direction
+# Open GPIO /dev/gpiochip0 line 10 with input direction
 gpio_in = GPIO("/dev/gpiochip0", 10, "in")
-# Open GPIO /dev/gpiochip0 12 with output direction
+# Open GPIO /dev/gpiochip0 line 12 with output direction
 gpio_out = GPIO("/dev/gpiochip0", 12, "out")
 
 value = gpio_in.read()
diff -Nru python-periphery-2.0.0/setup.py python-periphery-2.0.1/setup.py
--- python-periphery-2.0.0/setup.py	2019-10-29 03:46:27.000000000 +0000
+++ python-periphery-2.0.1/setup.py	2020-01-08 06:41:59.000000000 +0000
@@ -5,7 +5,7 @@
 
 setup(
     name='python-periphery',
-    version='2.0.0',
+    version='2.0.1',
     description='A pure Python 2/3 library for peripheral I/O (GPIO, LED, PWM, SPI, I2C, MMIO, Serial) in Linux.',
     author='vsergeev',
     author_email='v@sergeev.io',
diff -Nru python-periphery-2.0.0/tests/test_led.py python-periphery-2.0.1/tests/test_led.py
--- python-periphery-2.0.0/tests/test_led.py	2019-10-29 03:46:27.000000000 +0000
+++ python-periphery-2.0.1/tests/test_led.py	2020-01-08 06:41:59.000000000 +0000
@@ -35,6 +35,16 @@
     assert led.fd > 0
     assert led.max_brightness > 0
 
+    # Set brightness to True, check brightness
+    led.write(True)
+    time.sleep(0.01)
+    assert led.read() == led.max_brightness
+
+    # Set brightness to False, check brightness
+    led.write(False)
+    time.sleep(0.01)
+    assert led.read() == 0
+
     # Set brightness to 1, check brightness
     led.write(1)
     time.sleep(0.01)
@@ -55,16 +65,6 @@
     time.sleep(0.01)
     assert led.brightness == 0
 
-    # Set brightness to True, check brightness
-    led.write(True)
-    time.sleep(0.01)
-    assert led.read() == led.max_brightness
-
-    # Set brightness to False, check brightness
-    led.write(False)
-    time.sleep(0.01)
-    assert led.read() == 0
-
     led.close()
 
     print("Open/close test passed.")
diff -Nru python-periphery-2.0.0/tests/test_pwm.py python-periphery-2.0.1/tests/test_pwm.py
--- python-periphery-2.0.0/tests/test_pwm.py	2019-10-29 03:46:27.000000000 +0000
+++ python-periphery-2.0.1/tests/test_pwm.py	2020-01-08 06:41:59.000000000 +0000
@@ -38,7 +38,8 @@
     assert pwm.chip == pwm_chip
     assert pwm.channel == pwm_channel
 
-    # Initialize duty cycle to 0
+    # Initialize period and duty cycle
+    pwm.period = 5e-3
     pwm.duty_cycle = 0
 
     # Set period, check period, check period_ns, check frequency