diff --git a/tools/patman/README b/tools/patman/README
index 6664027..46b8e25 100644
--- a/tools/patman/README
+++ b/tools/patman/README
@@ -11,6 +11,8 @@
 - Runs the patches through checkpatch.pl and its own checks
 - Optionally emails them out to selected people
 
+It also shows review tags from Patchwork so you can update your local patches.
+
 It is intended to automate patch creation and make it a less
 error-prone process. It is useful for U-Boot and Linux work so far,
 since it uses the checkpatch.pl script.
@@ -352,6 +354,38 @@
 list for any of the patches.
 
 
+Patchwork Integration
+=====================
+
+Patman has a very basic integration with Patchwork. If you point patman to
+your series on patchwork it can show you what new reviews have appears since
+you sent your series.
+
+To set this up, add a Series-link tag to one of the commits in your series
+(see above).
+
+Then you can type
+
+    patman status
+
+and patman will show you each patch and what review tags have been collected,
+for example:
+
+...
+ 21 x86: mtrr: Update the command to use the new mtrr
+    Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
+  + Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
+ 22 x86: mtrr: Restructure so command execution is in
+    Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
+  + Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
+...
+
+This shows that patch 21 and 22 were sent out with one review but have since
+attracted another review each. If the series needs changes, you can update
+these commits with the new review tag before sending the next version of the
+series.
+
+
 Example Work Flow
 =================
 
diff --git a/tools/patman/control.py b/tools/patman/control.py
index 6555a40..7a5469a 100644
--- a/tools/patman/control.py
+++ b/tools/patman/control.py
@@ -175,3 +175,49 @@
         its_a_go, args.ignore_bad_tags, args.add_maintainers,
         args.limit, args.dry_run, args.in_reply_to, args.thread,
         args.smtp_server)
+
+def patchwork_status(branch, count, start, end):
+    """Check the status of patches in patchwork
+
+    This finds the series in patchwork using the Series-link tag, checks for new
+    comments / review tags and displays them
+
+    Args:
+        branch (str): Branch to create patches from (None = current)
+        count (int): Number of patches to produce, or -1 to produce patches for
+            the current branch back to the upstream commit
+        start (int): Start partch to use (0=first / top of branch)
+        end (int): End patch to use (0=last one in series, 1=one before that,
+            etc.)
+
+    Raises:
+        ValueError: if the branch has no Series-link value
+    """
+    if count == -1:
+        # Work out how many patches to send if we can
+        count = (gitutil.CountCommitsToBranch(branch) - start)
+
+    series = patchstream.get_metadata(branch, start, count - end)
+    warnings = 0
+    for cmt in series.commits:
+        if cmt.warn:
+            print('%d warnings for %s:' % (len(cmt.warn), cmt.hash))
+            for warn in cmt.warn:
+                print('\t', warn)
+                warnings += 1
+            print
+    if warnings:
+        raise ValueError('Please fix warnings before running status')
+    links = series.get('links')
+    if not links:
+        raise ValueError("Branch has no Series-links value")
+
+    # Find the link without a version number (we don't support versions yet)
+    found = [link for link in links.split() if not ':' in link]
+    if not found:
+        raise ValueError('Series-links has no current version (without :)')
+
+    # Import this here to avoid failing on other commands if the dependencies
+    # are not present
+    from patman import status
+    status.check_patchwork_status(series, found[0])
diff --git a/tools/patman/func_test.py b/tools/patman/func_test.py
index cce3905..722844e 100644
--- a/tools/patman/func_test.py
+++ b/tools/patman/func_test.py
@@ -13,10 +13,13 @@
 import tempfile
 import unittest
 
+
+from patman.commit import Commit
 from patman import control
 from patman import gitutil
 from patman import patchstream
 from patman.patchstream import PatchStream
+from patman.series import Series
 from patman import settings
 from patman import terminal
 from patman import tools
@@ -25,6 +28,7 @@
 try:
     import pygit2
     HAVE_PYGIT2 = True
+    from patman import status
 except ModuleNotFoundError:
     HAVE_PYGIT2 = False
 
@@ -36,6 +40,8 @@
     fred = 'Fred Bloggs <f.bloggs@napier.net>'
     joe = 'Joe Bloggs <joe@napierwallies.co.nz>'
     mary = 'Mary Bloggs <mary@napierwallies.co.nz>'
+    commits = None
+    patches = None
 
     def setUp(self):
         self.tmpdir = tempfile.mkdtemp(prefix='patman.')
@@ -44,6 +50,7 @@
 
     def tearDown(self):
         shutil.rmtree(self.tmpdir)
+        terminal.SetPrintTestMode(False)
 
     @staticmethod
     def _get_path(fname):
@@ -607,3 +614,311 @@
                 str(exc.exception))
         finally:
             os.chdir(orig_dir)
+
+    @staticmethod
+    def _fake_patchwork(subpath):
+        """Fake Patchwork server for the function below
+
+        This handles accessing a series, providing a list consisting of a
+        single patch
+        """
+        re_series = re.match(r'series/(\d*)/$', subpath)
+        if re_series:
+            series_num = re_series.group(1)
+            if series_num == '1234':
+                return {'patches': [
+                    {'id': '1', 'name': 'Some patch'}]}
+        raise ValueError('Fake Patchwork does not understand: %s' % subpath)
+
+    @unittest.skipIf(not HAVE_PYGIT2, 'Missing python3-pygit2')
+    def testStatusMismatch(self):
+        """Test Patchwork patches not matching the series"""
+        series = Series()
+
+        with capture_sys_output() as (_, err):
+            status.collect_patches(series, 1234, self._fake_patchwork)
+        self.assertIn('Warning: Patchwork reports 1 patches, series has 0',
+                      err.getvalue())
+
+    @unittest.skipIf(not HAVE_PYGIT2, 'Missing python3-pygit2')
+    def testStatusReadPatch(self):
+        """Test handling a single patch in Patchwork"""
+        series = Series()
+        series.commits = [Commit('abcd')]
+
+        patches = status.collect_patches(series, 1234, self._fake_patchwork)
+        self.assertEqual(1, len(patches))
+        patch = patches[0]
+        self.assertEqual('1', patch.id)
+        self.assertEqual('Some patch', patch.raw_subject)
+
+    @unittest.skipIf(not HAVE_PYGIT2, 'Missing python3-pygit2')
+    def testParseSubject(self):
+        """Test parsing of the patch subject"""
+        patch = status.Patch('1')
+
+        # Simple patch not in a series
+        patch.parse_subject('Testing')
+        self.assertEqual('Testing', patch.raw_subject)
+        self.assertEqual('Testing', patch.subject)
+        self.assertEqual(1, patch.seq)
+        self.assertEqual(1, patch.count)
+        self.assertEqual(None, patch.prefix)
+        self.assertEqual(None, patch.version)
+
+        # First patch in a series
+        patch.parse_subject('[1/2] Testing')
+        self.assertEqual('[1/2] Testing', patch.raw_subject)
+        self.assertEqual('Testing', patch.subject)
+        self.assertEqual(1, patch.seq)
+        self.assertEqual(2, patch.count)
+        self.assertEqual(None, patch.prefix)
+        self.assertEqual(None, patch.version)
+
+        # Second patch in a series
+        patch.parse_subject('[2/2] Testing')
+        self.assertEqual('Testing', patch.subject)
+        self.assertEqual(2, patch.seq)
+        self.assertEqual(2, patch.count)
+        self.assertEqual(None, patch.prefix)
+        self.assertEqual(None, patch.version)
+
+        # RFC patch
+        patch.parse_subject('[RFC,3/7] Testing')
+        self.assertEqual('Testing', patch.subject)
+        self.assertEqual(3, patch.seq)
+        self.assertEqual(7, patch.count)
+        self.assertEqual('RFC', patch.prefix)
+        self.assertEqual(None, patch.version)
+
+        # Version patch
+        patch.parse_subject('[v2,3/7] Testing')
+        self.assertEqual('Testing', patch.subject)
+        self.assertEqual(3, patch.seq)
+        self.assertEqual(7, patch.count)
+        self.assertEqual(None, patch.prefix)
+        self.assertEqual('v2', patch.version)
+
+        # All fields
+        patch.parse_subject('[RESEND,v2,3/7] Testing')
+        self.assertEqual('Testing', patch.subject)
+        self.assertEqual(3, patch.seq)
+        self.assertEqual(7, patch.count)
+        self.assertEqual('RESEND', patch.prefix)
+        self.assertEqual('v2', patch.version)
+
+        # RFC only
+        patch.parse_subject('[RESEND] Testing')
+        self.assertEqual('Testing', patch.subject)
+        self.assertEqual(1, patch.seq)
+        self.assertEqual(1, patch.count)
+        self.assertEqual('RESEND', patch.prefix)
+        self.assertEqual(None, patch.version)
+
+    @unittest.skipIf(not HAVE_PYGIT2, 'Missing python3-pygit2')
+    def testCompareSeries(self):
+        """Test operation of compare_with_series()"""
+        commit1 = Commit('abcd')
+        commit1.subject = 'Subject 1'
+        commit2 = Commit('ef12')
+        commit2.subject = 'Subject 2'
+        commit3 = Commit('3456')
+        commit3.subject = 'Subject 2'
+
+        patch1 = status.Patch('1')
+        patch1.subject = 'Subject 1'
+        patch2 = status.Patch('2')
+        patch2.subject = 'Subject 2'
+        patch3 = status.Patch('3')
+        patch3.subject = 'Subject 2'
+
+        series = Series()
+        series.commits = [commit1]
+        patches = [patch1]
+        patch_for_commit, commit_for_patch, warnings = (
+            status.compare_with_series(series, patches))
+        self.assertEqual(1, len(patch_for_commit))
+        self.assertEqual(patch1, patch_for_commit[0])
+        self.assertEqual(1, len(commit_for_patch))
+        self.assertEqual(commit1, commit_for_patch[0])
+
+        series.commits = [commit1]
+        patches = [patch1, patch2]
+        patch_for_commit, commit_for_patch, warnings = (
+            status.compare_with_series(series, patches))
+        self.assertEqual(1, len(patch_for_commit))
+        self.assertEqual(patch1, patch_for_commit[0])
+        self.assertEqual(1, len(commit_for_patch))
+        self.assertEqual(commit1, commit_for_patch[0])
+        self.assertEqual(["Cannot find commit for patch 2 ('Subject 2')"],
+                         warnings)
+
+        series.commits = [commit1, commit2]
+        patches = [patch1]
+        patch_for_commit, commit_for_patch, warnings = (
+            status.compare_with_series(series, patches))
+        self.assertEqual(1, len(patch_for_commit))
+        self.assertEqual(patch1, patch_for_commit[0])
+        self.assertEqual(1, len(commit_for_patch))
+        self.assertEqual(commit1, commit_for_patch[0])
+        self.assertEqual(["Cannot find patch for commit 2 ('Subject 2')"],
+                         warnings)
+
+        series.commits = [commit1, commit2, commit3]
+        patches = [patch1, patch2]
+        patch_for_commit, commit_for_patch, warnings = (
+            status.compare_with_series(series, patches))
+        self.assertEqual(2, len(patch_for_commit))
+        self.assertEqual(patch1, patch_for_commit[0])
+        self.assertEqual(patch2, patch_for_commit[1])
+        self.assertEqual(1, len(commit_for_patch))
+        self.assertEqual(commit1, commit_for_patch[0])
+        self.assertEqual(["Cannot find patch for commit 3 ('Subject 2')",
+                          "Multiple commits match patch 2 ('Subject 2'):\n"
+                          '   Subject 2\n   Subject 2'],
+                         warnings)
+
+        series.commits = [commit1, commit2]
+        patches = [patch1, patch2, patch3]
+        patch_for_commit, commit_for_patch, warnings = (
+            status.compare_with_series(series, patches))
+        self.assertEqual(1, len(patch_for_commit))
+        self.assertEqual(patch1, patch_for_commit[0])
+        self.assertEqual(2, len(commit_for_patch))
+        self.assertEqual(commit1, commit_for_patch[0])
+        self.assertEqual(["Multiple patches match commit 2 ('Subject 2'):\n"
+                          '   Subject 2\n   Subject 2',
+                          "Cannot find commit for patch 3 ('Subject 2')"],
+                         warnings)
+
+    def _fake_patchwork2(self, subpath):
+        """Fake Patchwork server for the function below
+
+        This handles accessing series, patches and comments, providing the data
+        in self.patches to the caller
+        """
+        re_series = re.match(r'series/(\d*)/$', subpath)
+        re_patch = re.match(r'patches/(\d*)/$', subpath)
+        re_comments = re.match(r'patches/(\d*)/comments/$', subpath)
+        if re_series:
+            series_num = re_series.group(1)
+            if series_num == '1234':
+                return {'patches': self.patches}
+        elif re_patch:
+            patch_num = int(re_patch.group(1))
+            patch = self.patches[patch_num - 1]
+            return patch
+        elif re_comments:
+            patch_num = int(re_comments.group(1))
+            patch = self.patches[patch_num - 1]
+            return patch.comments
+        raise ValueError('Fake Patchwork does not understand: %s' % subpath)
+
+    @unittest.skipIf(not HAVE_PYGIT2, 'Missing python3-pygit2')
+    def testFindNewResponses(self):
+        """Test operation of find_new_responses()"""
+        commit1 = Commit('abcd')
+        commit1.subject = 'Subject 1'
+        commit2 = Commit('ef12')
+        commit2.subject = 'Subject 2'
+
+        patch1 = status.Patch('1')
+        patch1.parse_subject('[1/2] Subject 1')
+        patch1.name = patch1.raw_subject
+        patch1.content = 'This is my patch content'
+        comment1a = {'content': 'Reviewed-by: %s\n' % self.joe}
+
+        patch1.comments = [comment1a]
+
+        patch2 = status.Patch('2')
+        patch2.parse_subject('[2/2] Subject 2')
+        patch2.name = patch2.raw_subject
+        patch2.content = 'Some other patch content'
+        comment2a = {
+            'content': 'Reviewed-by: %s\nTested-by: %s\n' %
+                       (self.mary, self.leb)}
+        comment2b = {'content': 'Reviewed-by: %s' % self.fred}
+        patch2.comments = [comment2a, comment2b]
+
+        # This test works by setting up commits and patch for use by the fake
+        # Rest API function _fake_patchwork2(). It calls various functions in
+        # the status module after setting up tags in the commits, checking that
+        # things behaves as expected
+        self.commits = [commit1, commit2]
+        self.patches = [patch1, patch2]
+        count = 2
+        new_rtag_list = [None] * count
+
+        # Check that the tags are picked up on the first patch
+        status.find_new_responses(new_rtag_list, 0, commit1, patch1,
+                                  self._fake_patchwork2)
+        self.assertEqual(new_rtag_list[0], {'Reviewed-by': {self.joe}})
+
+        # Now the second patch
+        status.find_new_responses(new_rtag_list, 1, commit2, patch2,
+                                  self._fake_patchwork2)
+        self.assertEqual(new_rtag_list[1], {
+            'Reviewed-by': {self.mary, self.fred},
+            'Tested-by': {self.leb}})
+
+        # Now add some tags to the commit, which means they should not appear as
+        # 'new' tags when scanning comments
+        new_rtag_list = [None] * count
+        commit1.rtags = {'Reviewed-by': {self.joe}}
+        status.find_new_responses(new_rtag_list, 0, commit1, patch1,
+                                  self._fake_patchwork2)
+        self.assertEqual(new_rtag_list[0], {})
+
+        # For the second commit, add Ed and Fred, so only Mary should be left
+        commit2.rtags = {
+            'Tested-by': {self.leb},
+            'Reviewed-by': {self.fred}}
+        status.find_new_responses(new_rtag_list, 1, commit2, patch2,
+                                  self._fake_patchwork2)
+        self.assertEqual(new_rtag_list[1], {'Reviewed-by': {self.mary}})
+
+        # Check that the output patches expectations:
+        #   1 Subject 1
+        #     Reviewed-by: Joe Bloggs <joe@napierwallies.co.nz>
+        #   2 Subject 2
+        #     Tested-by: Lord Edmund Blackaddër <weasel@blackadder.org>
+        #     Reviewed-by: Fred Bloggs <f.bloggs@napier.net>
+        #   + Reviewed-by: Mary Bloggs <mary@napierwallies.co.nz>
+        # 1 new response available in patchwork
+
+        series = Series()
+        series.commits = [commit1, commit2]
+        terminal.SetPrintTestMode()
+        status.check_patchwork_status(series, '1234', self._fake_patchwork2)
+        lines = iter(terminal.GetPrintTestLines())
+        col = terminal.Color()
+        self.assertEqual(terminal.PrintLine('  1 Subject 1', col.BLUE),
+                         next(lines))
+        self.assertEqual(
+            terminal.PrintLine('    Reviewed-by: ', col.GREEN, newline=False,
+                               bright=False),
+            next(lines))
+        self.assertEqual(terminal.PrintLine(self.joe, col.WHITE, bright=False),
+                         next(lines))
+
+        self.assertEqual(terminal.PrintLine('  2 Subject 2', col.BLUE),
+                         next(lines))
+        self.assertEqual(
+            terminal.PrintLine('    Tested-by: ', col.GREEN, newline=False,
+                               bright=False),
+            next(lines))
+        self.assertEqual(terminal.PrintLine(self.leb, col.WHITE, bright=False),
+                         next(lines))
+        self.assertEqual(
+            terminal.PrintLine('    Reviewed-by: ', col.GREEN, newline=False,
+                               bright=False),
+            next(lines))
+        self.assertEqual(terminal.PrintLine(self.fred, col.WHITE, bright=False),
+                         next(lines))
+        self.assertEqual(
+            terminal.PrintLine('  + Reviewed-by: ', col.GREEN, newline=False),
+            next(lines))
+        self.assertEqual(terminal.PrintLine(self.mary, col.WHITE),
+                         next(lines))
+        self.assertEqual(terminal.PrintLine(
+            '1 new response available in patchwork', None), next(lines))
diff --git a/tools/patman/main.py b/tools/patman/main.py
index d1a43c4..7f4ae11 100755
--- a/tools/patman/main.py
+++ b/tools/patman/main.py
@@ -90,6 +90,10 @@
                          help="Specify the test to run")
 AddCommonArgs(test_parser)
 
+status = subparsers.add_parser('status',
+                               help='Check status of patches in patchwork')
+AddCommonArgs(status)
+
 # Parse options twice: first to get the project and second to handle
 # defaults properly (which depends on project).
 argv = sys.argv[1:]
@@ -157,3 +161,17 @@
 
     else:
         control.send(args)
+
+# Check status of patches in patchwork
+elif args.cmd == 'status':
+    ret_code = 0
+    try:
+        control.patchwork_status(args.branch, args.count, args.start, args.end)
+    except Exception as e:
+        terminal.Print('patman: %s: %s' % (type(e).__name__, e),
+                       colour=terminal.Color.RED)
+        if args.debug:
+            print()
+            traceback.print_exc()
+        ret_code = 1
+    sys.exit(ret_code)
diff --git a/tools/patman/status.py b/tools/patman/status.py
new file mode 100644
index 0000000..f41b2d4
--- /dev/null
+++ b/tools/patman/status.py
@@ -0,0 +1,356 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright 2020 Google LLC
+#
+"""Talks to the patchwork service to figure out what patches have been reviewed
+and commented on.
+"""
+
+import collections
+import concurrent.futures
+from itertools import repeat
+import re
+import requests
+
+from patman.patchstream import PatchStream
+from patman import terminal
+from patman import tout
+
+# Patches which are part of a multi-patch series are shown with a prefix like
+# [prefix, version, sequence], for example '[RFC, v2, 3/5]'. All but the last
+# part is optional. This decodes the string into groups. For single patches
+# the [] part is not present:
+# Groups: (ignore, ignore, ignore, prefix, version, sequence, subject)
+RE_PATCH = re.compile(r'(\[(((.*),)?(.*),)?(.*)\]\s)?(.*)$')
+
+# This decodes the sequence string into a patch number and patch count
+RE_SEQ = re.compile(r'(\d+)/(\d+)')
+
+def to_int(vals):
+    """Convert a list of strings into integers, using 0 if not an integer
+
+    Args:
+        vals (list): List of strings
+
+    Returns:
+        list: List of integers, one for each input string
+    """
+    out = [int(val) if val.isdigit() else 0 for val in vals]
+    return out
+
+
+class Patch(dict):
+    """Models a patch in patchwork
+
+    This class records information obtained from patchwork
+
+    Some of this information comes from the 'Patch' column:
+
+        [RFC,v2,1/3] dm: Driver and uclass changes for tiny-dm
+
+    This shows the prefix, version, seq, count and subject.
+
+    The other properties come from other columns in the display.
+
+    Properties:
+        pid (str): ID of the patch (typically an integer)
+        seq (int): Sequence number within series (1=first) parsed from sequence
+            string
+        count (int): Number of patches in series, parsed from sequence string
+        raw_subject (str): Entire subject line, e.g.
+            "[1/2,v2] efi_loader: Sort header file ordering"
+        prefix (str): Prefix string or None (e.g. 'RFC')
+        version (str): Version string or None (e.g. 'v2')
+        raw_subject (str): Raw patch subject
+        subject (str): Patch subject with [..] part removed (same as commit
+            subject)
+    """
+    def __init__(self, pid):
+        super().__init__()
+        self.id = pid  # Use 'id' to match what the Rest API provides
+        self.seq = None
+        self.count = None
+        self.prefix = None
+        self.version = None
+        self.raw_subject = None
+        self.subject = None
+
+    # These make us more like a dictionary
+    def __setattr__(self, name, value):
+        self[name] = value
+
+    def __getattr__(self, name):
+        return self[name]
+
+    def __hash__(self):
+        return hash(frozenset(self.items()))
+
+    def __str__(self):
+        return self.raw_subject
+
+    def parse_subject(self, raw_subject):
+        """Parse the subject of a patch into its component parts
+
+        See RE_PATCH for details. The parsed info is placed into seq, count,
+        prefix, version, subject
+
+        Args:
+            raw_subject (str): Subject string to parse
+
+        Raises:
+            ValueError: the subject cannot be parsed
+        """
+        self.raw_subject = raw_subject.strip()
+        mat = RE_PATCH.search(raw_subject.strip())
+        if not mat:
+            raise ValueError("Cannot parse subject '%s'" % raw_subject)
+        self.prefix, self.version, seq_info, self.subject = mat.groups()[3:]
+        mat_seq = RE_SEQ.match(seq_info) if seq_info else False
+        if mat_seq is None:
+            self.version = seq_info
+            seq_info = None
+        if self.version and not self.version.startswith('v'):
+            self.prefix = self.version
+            self.version = None
+        if seq_info:
+            if mat_seq:
+                self.seq = int(mat_seq.group(1))
+                self.count = int(mat_seq.group(2))
+        else:
+            self.seq = 1
+            self.count = 1
+
+def compare_with_series(series, patches):
+    """Compare a list of patches with a series it came from
+
+    This prints any problems as warnings
+
+    Args:
+        series (Series): Series to compare against
+        patches (:type: list of Patch): list of Patch objects to compare with
+
+    Returns:
+        tuple
+            dict:
+                key: Commit number (0...n-1)
+                value: Patch object for that commit
+            dict:
+                key: Patch number  (0...n-1)
+                value: Commit object for that patch
+    """
+    # Check the names match
+    warnings = []
+    patch_for_commit = {}
+    all_patches = set(patches)
+    for seq, cmt in enumerate(series.commits):
+        pmatch = [p for p in all_patches if p.subject == cmt.subject]
+        if len(pmatch) == 1:
+            patch_for_commit[seq] = pmatch[0]
+            all_patches.remove(pmatch[0])
+        elif len(pmatch) > 1:
+            warnings.append("Multiple patches match commit %d ('%s'):\n   %s" %
+                            (seq + 1, cmt.subject,
+                             '\n   '.join([p.subject for p in pmatch])))
+        else:
+            warnings.append("Cannot find patch for commit %d ('%s')" %
+                            (seq + 1, cmt.subject))
+
+
+    # Check the names match
+    commit_for_patch = {}
+    all_commits = set(series.commits)
+    for seq, patch in enumerate(patches):
+        cmatch = [c for c in all_commits if c.subject == patch.subject]
+        if len(cmatch) == 1:
+            commit_for_patch[seq] = cmatch[0]
+            all_commits.remove(cmatch[0])
+        elif len(cmatch) > 1:
+            warnings.append("Multiple commits match patch %d ('%s'):\n   %s" %
+                            (seq + 1, patch.subject,
+                             '\n   '.join([c.subject for c in cmatch])))
+        else:
+            warnings.append("Cannot find commit for patch %d ('%s')" %
+                            (seq + 1, patch.subject))
+
+    return patch_for_commit, commit_for_patch, warnings
+
+def call_rest_api(subpath):
+    """Call the patchwork API and return the result as JSON
+
+    Args:
+        subpath (str): URL subpath to use
+
+    Returns:
+        dict: Json result
+
+    Raises:
+        ValueError: the URL could not be read
+    """
+    url = 'https://patchwork.ozlabs.org/api/1.2/%s' % subpath
+    response = requests.get(url)
+    if response.status_code != 200:
+        raise ValueError("Could not read URL '%s'" % url)
+    return response.json()
+
+def collect_patches(series, series_id, rest_api=call_rest_api):
+    """Collect patch information about a series from patchwork
+
+    Uses the Patchwork REST API to collect information provided by patchwork
+    about the status of each patch.
+
+    Args:
+        series (Series): Series object corresponding to the local branch
+            containing the series
+        series_id (str): Patch series ID number
+        rest_api (function): API function to call to access Patchwork, for
+            testing
+
+    Returns:
+        list: List of patches sorted by sequence number, each a Patch object
+
+    Raises:
+        ValueError: if the URL could not be read or the web page does not follow
+            the expected structure
+    """
+    data = rest_api('series/%s/' % series_id)
+
+    # Get all the rows, which are patches
+    patch_dict = data['patches']
+    count = len(patch_dict)
+    num_commits = len(series.commits)
+    if count != num_commits:
+        tout.Warning('Warning: Patchwork reports %d patches, series has %d' %
+                     (count, num_commits))
+
+    patches = []
+
+    # Work through each row (patch) one at a time, collecting the information
+    warn_count = 0
+    for pw_patch in patch_dict:
+        patch = Patch(pw_patch['id'])
+        patch.parse_subject(pw_patch['name'])
+        patches.append(patch)
+    if warn_count > 1:
+        tout.Warning('   (total of %d warnings)' % warn_count)
+
+    # Sort patches by patch number
+    patches = sorted(patches, key=lambda x: x.seq)
+    return patches
+
+def find_new_responses(new_rtag_list, seq, cmt, patch, rest_api=call_rest_api):
+    """Find new rtags collected by patchwork that we don't know about
+
+    This is designed to be run in parallel, once for each commit/patch
+
+    Args:
+        new_rtag_list (list): New rtags are written to new_rtag_list[seq]
+            list, each a dict:
+                key: Response tag (e.g. 'Reviewed-by')
+                value: Set of people who gave that response, each a name/email
+                    string
+        seq (int): Position in new_rtag_list to update
+        cmt (Commit): Commit object for this commit
+        patch (Patch): Corresponding Patch object for this patch
+        rest_api (function): API function to call to access Patchwork, for
+            testing
+    """
+    if not patch:
+        return
+
+    # Get the content for the patch email itself as well as all comments
+    data = rest_api('patches/%s/' % patch.id)
+    pstrm = PatchStream.process_text(data['content'], True)
+
+    rtags = collections.defaultdict(set)
+    for response, people in pstrm.commit.rtags.items():
+        rtags[response].update(people)
+
+    data = rest_api('patches/%s/comments/' % patch.id)
+
+    for comment in data:
+        pstrm = PatchStream.process_text(comment['content'], True)
+        for response, people in pstrm.commit.rtags.items():
+            rtags[response].update(people)
+
+    # Find the tags that are not in the commit
+    new_rtags = collections.defaultdict(set)
+    base_rtags = cmt.rtags
+    for tag, people in rtags.items():
+        for who in people:
+            is_new = (tag not in base_rtags or
+                      who not in base_rtags[tag])
+            if is_new:
+                new_rtags[tag].add(who)
+    new_rtag_list[seq] = new_rtags
+
+def show_responses(rtags, indent, is_new):
+    """Show rtags collected
+
+    Args:
+        rtags (dict): review tags to show
+            key: Response tag (e.g. 'Reviewed-by')
+            value: Set of people who gave that response, each a name/email string
+        indent (str): Indentation string to write before each line
+        is_new (bool): True if this output should be highlighted
+
+    Returns:
+        int: Number of review tags displayed
+    """
+    col = terminal.Color()
+    count = 0
+    for tag, people in rtags.items():
+        for who in people:
+            terminal.Print(indent + '%s %s: ' % ('+' if is_new else ' ', tag),
+                           newline=False, colour=col.GREEN, bright=is_new)
+            terminal.Print(who, colour=col.WHITE, bright=is_new)
+            count += 1
+    return count
+
+def check_patchwork_status(series, series_id, rest_api=call_rest_api):
+    """Check the status of a series on Patchwork
+
+    This finds review tags and comments for a series in Patchwork, displaying
+    them to show what is new compared to the local series.
+
+    Args:
+        series (Series): Series object for the existing branch
+        series_id (str): Patch series ID number
+        rest_api (function): API function to call to access Patchwork, for
+            testing
+    """
+    patches = collect_patches(series, series_id, rest_api)
+    col = terminal.Color()
+    count = len(series.commits)
+    new_rtag_list = [None] * count
+
+    patch_for_commit, _, warnings = compare_with_series(series, patches)
+    for warn in warnings:
+        tout.Warning(warn)
+
+    patch_list = [patch_for_commit.get(c) for c in range(len(series.commits))]
+
+    with concurrent.futures.ThreadPoolExecutor(max_workers=16) as executor:
+        futures = executor.map(
+            find_new_responses, repeat(new_rtag_list), range(count),
+            series.commits, patch_list, repeat(rest_api))
+    for fresponse in futures:
+        if fresponse:
+            raise fresponse.exception()
+
+    num_to_add = 0
+    for seq, cmt in enumerate(series.commits):
+        patch = patch_for_commit.get(seq)
+        if not patch:
+            continue
+        terminal.Print('%3d %s' % (patch.seq, patch.subject[:50]),
+                       colour=col.BLUE)
+        cmt = series.commits[seq]
+        base_rtags = cmt.rtags
+        new_rtags = new_rtag_list[seq]
+
+        indent = ' ' * 2
+        show_responses(base_rtags, indent, False)
+        num_to_add += show_responses(new_rtags, indent, True)
+
+    terminal.Print("%d new response%s available in patchwork" %
+                   (num_to_add, 's' if num_to_add != 1 else ''))
diff --git a/tools/patman/terminal.py b/tools/patman/terminal.py
index 60dbce3..9be03b3 100644
--- a/tools/patman/terminal.py
+++ b/tools/patman/terminal.py
@@ -34,14 +34,22 @@
         newline: True to output a newline after the text
         colour: Text colour to use
     """
-    def __init__(self, text, newline, colour):
+    def __init__(self, text, colour, newline=True, bright=True):
         self.text = text
         self.newline = newline
         self.colour = colour
+        self.bright = bright
+
+    def __eq__(self, other):
+        return (self.text == other.text and
+                self.newline == other.newline and
+                self.colour == other.colour and
+                self.bright == other.bright)
 
     def __str__(self):
-        return 'newline=%s, colour=%s, text=%s' % (self.newline, self.colour,
-                self.text)
+        return ("newline=%s, colour=%s, bright=%d, text='%s'" %
+                (self.newline, self.colour, self.bright, self.text))
+
 
 def CalcAsciiLen(text):
     """Calculate the length of a string, ignoring any ANSI sequences
@@ -136,7 +144,7 @@
     global last_print_len
 
     if print_test_mode:
-        print_test_list.append(PrintLine(text, newline, colour))
+        print_test_list.append(PrintLine(text, colour, newline, bright))
     else:
         if colour:
             col = Color()
@@ -159,11 +167,12 @@
         print('\r%s\r' % (' '* last_print_len), end='', flush=True)
         last_print_len = None
 
-def SetPrintTestMode():
+def SetPrintTestMode(enable=True):
     """Go into test mode, where all printing is recorded"""
     global print_test_mode
 
-    print_test_mode = True
+    print_test_mode = enable
+    GetPrintTestLines()
 
 def GetPrintTestLines():
     """Get a list of all lines output through Print()