The quartz-load-femtofarads are relevant for
several users. Add it as a common property in rtc.
Note that valid values and default values must be documented.

Signed-off-by: Sam Ravnborg <[email protected]>
Suggested-by: Rob Herring <[email protected]>
Cc: Alessandro Zummo <[email protected]>
Cc: Alexandre Belloni <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: Mark Rutland <[email protected]>
---
 Documentation/devicetree/bindings/rtc/rtc.txt | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/Documentation/devicetree/bindings/rtc/rtc.txt 
b/Documentation/devicetree/bindings/rtc/rtc.txt
index 7c8da6926095..41eb335ea816 100644
--- a/Documentation/devicetree/bindings/rtc/rtc.txt
+++ b/Documentation/devicetree/bindings/rtc/rtc.txt
@@ -21,12 +21,16 @@ Optional properties
 The following properties may not be supported by all drivers. However, if a
 driver wants to support one of the below features, it should adapt the bindings
 below.
-- trickle-resistor-ohms : Selected resistor for trickle charger. Should be 
given
-                          if trickle charger should be enabled
-- trickle-diode-disable : Do not use internal trickle charger diode Should be
-                          given if internal trickle charger diode should be
-                          disabled
-- wakeup-source :         Enables wake up of host system on alarm
+- trickle-resistor-ohms :   Selected resistor for trickle charger. Should be 
given
+                            if trickle charger should be enabled
+- trickle-diode-disable :   Do not use internal trickle charger diode Should be
+                            given if internal trickle charger diode should be
+                            disabled
+- wakeup-source :           Enables wake up of host system on alarm
+- quartz-load-femtofarads : The capacitive load of the quartz(x-tal),
+                            expressed in femto Farad (fF).
+                            The default value shall be listed (if optional),
+                            and likewise all valid values.
 
 Trivial RTCs
 ------------
-- 
2.12.0

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