i2c: initial bus drivers for am335x and dm37xx

Change-Id: I478704fbf30dbf6d3382bcbfb11e75b512c032a1

commands/MAKEDEV/MAKEDEV.sh

@@ -23,7 +23,8 @@ case $#:$1 in
 	ttypa ttypb ttypc ttypd ttype ttypf \
 	ttyq0 ttyq1 ttyq2 ttyq3 ttyq4 ttyq5 ttyq6 ttyq7 ttyq8 ttyq9 \
 	ttyqa ttyqb ttyqc ttyqd ttyqe ttyqf \
-	eth klog random uds filter fbd hello fb0
+	eth klog random uds filter fbd hello fb0 \
+	i2c-1 i2c-2 i2c-3
     ;;
 0:|1:-\?)
     cat >&2 <<EOF
@@ -31,6 +32,7 @@ Usage:	$0 [-n] key ...
 Where key is one of the following:
   ram mem kmem null boot zero	  # One of these makes all these memory devices
   fb0			  # Make /dev/fb0
+  i2c-1 i2c-2 i2c-3       # Make /dev/i2c-[1-3]
   fd0 fd1 ...		  # Floppy devices for drive 0, 1, ...
   fd0p0 fd1p0 ...	  # Make floppy partitions fd0p[0-3], fd1p[0-3], ...
   c0d0 c0d1 ...		  # Make disks c0d0, c0d1, ...
@@ -284,6 +286,13 @@ do
 	$e mknod fb0 c 19 0
 	$e chmod 644 fb0
 	;;
+    i2c-[1-3])
+	# i2c driver
+	b=`expr $dev : '....\\(.*\\)'` # bus number
+	m=`expr $dev : '....\\(.*\\)' - 1` # least significant digit of major
+	$e mknod i2c-${b} c 2${m} 0
+	$e chmod 600 i2c-${b}
+	;;
     *)
 	echo "$0: don't know about $dev" >&2
 	ex=1