Documentation: dt-bindings: trickle charger dt binding document for ds1339

Some DS13XX devices have "trickle chargers".  Introduce a device tree
binding for the resistor and diode configuration for enabling trickle
charger.

Signed-off-by: Matti Vaittinen <matti.vaittinen@nsn.com>
Acked-by: Jason Cooper <jason@lakedaemon.net>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Pawel Moll <pawel.moll@arm.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Pavel Machek <pavel@denx.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 18 insertions, 1 deletions

diff --git a/Documentation/devicetree/bindings/i2c/trivial-devices.txt b/Documentation/devicetree/bindings/i2c/trivial-devices.txt
index 5af3d9df6ecb..fbde415078e6 100644
--- a/Documentation/devicetree/bindings/i2c/trivial-devices.txt
+++ b/Documentation/devicetree/bindings/i2c/trivial-devices.txt
@@ -35,7 +35,6 @@ catalyst,24c32		i2c serial eeprom
 cirrus,cs42l51          Cirrus Logic CS42L51 audio codec
 dallas,ds1307           64 x 8, Serial, I2C Real-Time Clock
 dallas,ds1338           I2C RTC with 56-Byte NV RAM
-dallas,ds1339           I2C Serial Real-Time Clock
 dallas,ds1340           I2C RTC with Trickle Charger
 dallas,ds1374           I2C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output
 dallas,ds1631           High-Precision Digital Thermometer
diff --git a/Documentation/devicetree/bindings/rtc/dallas,ds1339.txt b/Documentation/devicetree/bindings/rtc/dallas,ds1339.txt
new file mode 100644
index 000000000000..916f57601a8f
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/dallas,ds1339.txt
@@ -0,0 +1,18 @@
+* Dallas DS1339         I2C Serial Real-Time Clock
+
+Required properties:
+- compatible: Should contain "dallas,ds1339".
+- reg: I2C address for chip
+
+Optional properties:
+- trickle-resistor-ohms : Selected resistor for trickle charger
+        Values usable for ds1339 are 250, 2000, 4000
+        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
+Example:
+        ds1339: rtc@68 {
+                compatible = "dallas,ds1339";
+                trickle-resistor-ohms = <250>;
+                reg = <0x68>;
+        };