X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2FDocumentation%2Fi2c%2Ften-bit-addresses;h=7b2d11e53a49f14c09190449172d539c4725e503;hb=e09b41010ba33a20a87472ee821fa407a5b8da36;hp=cdfe13901b99cb64a9bbc2484b13ca7cd174e878;hpb=f93b97fd65072de626c074dbe099a1fff05ce060;p=kvmfornfv.git

diff --git a/kernel/Documentation/i2c/ten-bit-addresses b/kernel/Documentation/i2c/ten-bit-addresses
index cdfe13901..7b2d11e53 100644
--- a/kernel/Documentation/i2c/ten-bit-addresses
+++ b/kernel/Documentation/i2c/ten-bit-addresses
@@ -2,6 +2,10 @@ The I2C protocol knows about two kinds of device addresses: normal 7 bit
 addresses, and an extended set of 10 bit addresses. The sets of addresses
 do not intersect: the 7 bit address 0x10 is not the same as the 10 bit
 address 0x10 (though a single device could respond to both of them).
+To avoid ambiguity, the user sees 10 bit addresses mapped to a different
+address space, namely 0xa000-0xa3ff. The leading 0xa (= 10) represents the
+10 bit mode. This is used for creating device names in sysfs. It is also
+needed when instantiating 10 bit devices via the new_device file in sysfs.
 
 I2C messages to and from 10-bit address devices have a different format.
 See the I2C specification for the details.