Introduce web sequence diagram for Open CI Jobs

This sequence reflects current CI Job flow and illustrates better the
differences between current ARM CI and Open CI.

Change-Id: I13640f09c1006b1a53a8b2dde811edaea61e2d1c
Signed-off-by: Leonardo Sandoval <leonardo.sandoval@linaro.org>
diff --git a/docs/jobs_seq.txt b/docs/jobs_seq.txt
index e0ede36..5a5346b 100644
--- a/docs/jobs_seq.txt
+++ b/docs/jobs_seq.txt
@@ -1,5 +1,5 @@
 # This is to be pasted on to websequencediagrams.com to get the sequence
-# diagram of current CI setup
+# diagram of current ARM CI setup
 
 title Trusted Firmware CI core jobs
 
diff --git a/docs/open_jobs_seq.txt b/docs/open_jobs_seq.txt
new file mode 100644
index 0000000..e2c8e04
--- /dev/null
+++ b/docs/open_jobs_seq.txt
@@ -0,0 +1,21 @@
+# This is to be pasted on to websequencediagrams.com to get the sequence
+# diagram of current CI setup
+
+title Trusted Firmware Open CI core jobs
+
+actor user/gerrit
+participant trigger-tf-a-builder
+user/gerrit->+trigger-tf-a-builder: trigger for each patchset
+trigger-tf-a-builder->+tf-a-builder:
+tf-a-builder->+builders.sh:
+builders.sh->+run_local_ci.sh: launch build
+note over run_local_ci.sh:  build/test for a single test file (makefile)
+run_local_ci.sh->+builders.sh: complete
+builders.sh->+tf-a-builder:
+note over tf-a-builder: generate LAVA Juno/FVP YAML
+tf-a-builder->+post-build-lava:
+post-build-lava->+LAVA: submit job
+note over LAVA: Juno/FVP boot test
+LAVA->+post-build-lava: completes
+post-build-lava->+tf-a-builder:
+tf-a-builder->+trigger-tf-a-builder: