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Diffstat (limited to 'kernel/Documentation/i2c/ten-bit-addresses')
| -rw-r--r-- | kernel/Documentation/i2c/ten-bit-addresses | 4 |
1 files changed, 4 insertions, 0 deletions
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. |