[FE training-materials-updates] Update i2c communication lab

[Michael Opdenacker]

Repository : git://git.free-electrons.com/training-materials.git

On branch  : kernel-ng
Link       : http://git.free-electrons.com/training-materials/commit/?id=8804f270fb8928005db92192c1817187b45b3664

>---------------------------------------------------------------

commit 8804f270fb8928005db92192c1817187b45b3664
Author: Michael Opdenacker <michael.opdenacker at free-electrons.com>
Date:   Wed Oct 2 15:08:09 2013 +0200

    Update i2c communication lab
    
    - Weird: I don't see any difference with git diff,
      but it's still reported as modified
    
    Signed-off-by: Michael Opdenacker <michael.opdenacker at free-electrons.com>


>---------------------------------------------------------------

8804f270fb8928005db92192c1817187b45b3664
 .../kernel-i2c-communication.tex                   |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/labs/kernel-i2c-communication/kernel-i2c-communication.tex b/labs/kernel-i2c-communication/kernel-i2c-communication.tex
index 0f1cecc..17506f1 100644
--- a/labs/kernel-i2c-communication/kernel-i2c-communication.tex
+++ b/labs/kernel-i2c-communication/kernel-i2c-communication.tex
@@ -68,6 +68,20 @@ I2C Block Write                  yes
 I2C Block Read                   yes
 \end{verbatim}
 
+If everything works as expected, commit your Device Tree changes. This
+will be required switch to another branch later:
+
+\begin{verbatim}
+git commit -as
+\end{verbatim}
+
+\begin{itemize}
+\item \code{git commit -a} adds all the files already known to
+      \code{git} to the commit.
+\item \code{git commit -s} adds a \code{Signed-off-by} line (required
+      for all contributions to the Linux kernel).
+\end{itemize}
+
 \section{Device initialization}
 
 The next step is to read the state of the nunchuk registers, to find out