1 files changed, 4 insertions, 2 deletions

diff --git a/include/linux/i2c-algo-bit.h b/include/linux/i2c-algo-bit.h
index d91dab886357..9ee0f800592f 100644
--- a/include/linux/i2c-algo-bit.h
+++ b/include/linux/i2c-algo-bit.h
@@ -38,8 +38,10 @@ struct i2c_algo_bit_data {
         int  (*getscl) (void *data);
 
         /* local settings */
-        int udelay;             /* half-clock-cycle time in microsecs */
-                                /* i.e. clock is (500 / udelay) KHz */
+        int udelay;             /* half clock cycle time in us,
+                                   minimum 2 us for fast-mode I2C,
+                                   minimum 5 us for standard-mode I2C and SMBus,
+                                   maximum 50 us for SMBus */
         int timeout;            /* in jiffies */
 };