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authorZhangfei Gao2010-03-02 12:23:49 +0100
committerJean Delvare2010-03-02 12:23:49 +0100
commit0c43ea544c1086fbbed5a6c99ea58eb64674ea8f (patch)
tree1d50d78c261cd011667c12134d93f2d6d2caa6e5 /Documentation/i2c
parenteec74a257f0a695688ba44c0f6c1e92dc81459be (diff)
i2c: Document the message size limit
i2c_master_send & i2c_master_recv do not support more than 64 kb transfer, since msg.len is u16. Signed-off-by: Zhangfei Gao <zgao6@marvell.com> Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'Documentation/i2c')
-rw-r--r--Documentation/i2c/writing-clients5
1 files changed, 3 insertions, 2 deletions
diff --git a/Documentation/i2c/writing-clients b/Documentation/i2c/writing-clients
index 0a74603eb671..3219ee0dbfef 100644
--- a/Documentation/i2c/writing-clients
+++ b/Documentation/i2c/writing-clients
@@ -318,8 +318,9 @@ Plain I2C communication
These routines read and write some bytes from/to a client. The client
contains the i2c address, so you do not have to include it. The second
parameter contains the bytes to read/write, the third the number of bytes
-to read/write (must be less than the length of the buffer.) Returned is
-the actual number of bytes read/written.
+to read/write (must be less than the length of the buffer, also should be
+less than 64k since msg.len is u16.) Returned is the actual number of bytes
+read/written.
int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msg,
int num);