u-boot/doc/device-tree-bindings/rtc/ds3232.txt

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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>;
};