mtd: part: Add sysfs variable for offset of partition

This patch makes a sysfs variable called 'offset' on each partition
which contains the offset in bytes from the beginning of the master
device that the partition starts.

Signed-off-by: Dan Ehrenberg <dehrenberg@chromium.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-class-mtd b/Documentation/ABI/testing/sysfs-class-mtd
index 76ee192f80a0..3b5c3bca9186 100644
--- a/Documentation/ABI/testing/sysfs-class-mtd
+++ b/Documentation/ABI/testing/sysfs-class-mtd
@@ -222,3 +222,13 @@ Description:
                 The number of blocks that are marked as reserved, if any, in
                 this partition. These are typically used to store the in-flash
                 bad block table (BBT).
+
+What:           /sys/class/mtd/mtdX/offset
+Date:           March 2015
+KernelVersion:  4.1
+Contact:        linux-mtd@lists.infradead.org
+Description:
+                For a partition, the offset of that partition from the start
+                of the master device in bytes. This attribute is absent on
+                main devices, so it can be used to distinguish between
+                partitions and devices that aren't partitions.