Submodule diff sample (sub is the submodule's root directory):

diff --git a/sub b/sub
index 6ae5025..4b26500 160000
--- a/sub
+++ b/sub
@@ -1 +1 @@
-Subproject commit 6ae5025c9a66767e90cd320f9661e7694f7ea8b5
+Subproject commit 4b2650066d4143e8b7a9f4b19e46b96996a1dd90

Change-Id: I388de5bc50ceb1fcfc31a3a70ce8328c83fafa71
Reviewed-by: Jarek Kobus <jaroslaw.kobus@digia.com>