dm: fsl_i2c: Reword and clarify comment

Signed-off-by: Mario Six <mario.six@gdsys.cc>

diff --git a/drivers/i2c/fsl_i2c.c b/drivers/i2c/fsl_i2c.c
index b0e65fc..18b8848 100644 (file)
--- a/drivers/i2c/fsl_i2c.c
+++ b/drivers/i2c/fsl_i2c.c
@@ -428,22 +428,14 @@ fsl_i2c_read(struct i2c_adapter *adap, u8 chip_addr, uint offset, int olen,
        if (i2c_wait4bus(adap) < 0)
                return -1;
 
-       /* To handle the need of I2C devices that require to write few bytes
-        * (more than 4 bytes of address as in the case of else part)
-        * of data before reading, Negative equivalent of dlen(bytes to write)
-        * is passed, but used the +ve part of len for writing data
+       /* Some drivers use offset lengths in excess of 4 bytes. These drivers
+        * adhere to the following convention:
+        * - the offset length is passed as negative (that is, the absolute
+        *   value of olen is the actual offset length)
+        * - the offset itself is passed in data, which is overwritten by the
+        *   subsequent read operation
         */
        if (olen < 0) {
-               /* Generate a START and send the Address and
-                * the Tx Bytes to the slave.
-                * "START: Address: Write bytes data[len]"
-                * IF part supports writing any number of bytes in contrast
-                * to the else part, which supports writing address offset
-                * of upto 4 bytes only.
-                * bytes that need to be written are passed in
-                * "data", which will eventually keep the data READ,
-                * after writing the len bytes out of it
-                */
                if (i2c_write_addr(adap, chip_addr, I2C_WRITE_BIT, 0) != 0)
                        ret = __i2c_write(adap, data, len);