1 files changed, 5 insertions, 2 deletions

diff --git a/Documentation/devicetree/bindings/i2c/i2c-rk3x.txt b/Documentation/devicetree/bindings/i2c/i2c-rk3x.txt
index c4fd545720af..f0d71bc52e64 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-rk3x.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c-rk3x.txt
@@ -21,14 +21,17 @@ Required on RK3066, RK3188 :
 Optional properties :
 
  - clock-frequency : SCL frequency to use (in Hz). If omitted, 100kHz is used.
- - i2c-scl-rising-time-ns : Number of nanoseconds the signal takes to rise
+ - i2c-scl-rising-time-ns : Number of nanoseconds the SCL signal takes to rise
         (t(r) in I2C specification). If not specified this is assumed to be
         the maximum the specification allows(1000 ns for Standard-mode,
         300 ns for Fast-mode) which might cause slightly slower communication.
- - i2c-scl-falling-time-ns : Number of nanoseconds the signal takes to fall
+ - i2c-scl-falling-time-ns : Number of nanoseconds the SCL signal takes to fall
         (t(f) in the I2C specification). If not specified this is assumed to
         be the maximum the specification allows (300 ns) which might cause
         slightly slower communication.
+ - i2c-sda-falling-time-ns : Number of nanoseconds the SDA signal takes to fall
+        (t(f) in the I2C specification). If not specified we'll use the SCL
+        value since they are the same in nearly all cases.
 
 Example: