rtc: add support for DS3232 device

DS3232 is an i2c RTC with 236 bytes of battery-backed SRAM.

Add an RTC driver for DS3232 device, which provides time and
date support. Also read and write functions are provided,
which can be used to access the SRAM memory.

Signed-off-by: Nandor Han <nandor.han@vaisala.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/doc/device-tree-bindings/rtc/ds3232.txt b/doc/device-tree-bindings/rtc/ds3232.txt
new file mode 100644
index 0000000000..254b7bc3c3
--- /dev/null
+++ b/doc/device-tree-bindings/rtc/ds3232.txt
@@ -0,0 +1,15 @@
+DS3232 Real-Time Clock with SRAM
+
+The RTC driver provides time and date functionality. Also read and write
+functions are provided that can be used to access the SRAM memory.
+
+Required properties:
+- compatible     : should contain "dallas,ds3232"
+- reg            : the I2C RTC address
+
+Example:
+
+rtc@68 {
+	compatible = "dallas,ds3232";
+	reg = <0x68>;
+};