1* NXP PCF8523 Real Time Clock 2 3Required properties: 4- compatible: Should contain "nxp,pcf8523". 5- reg: I2C address for chip. 6 7Optional property: 8- quartz-load-femtofarads: The capacitive load of the quartz(x-tal), 9 expressed in femto Farad (fF). Valid values are 7000 and 12500. 10 Default value (if no value is specified) is 12500fF. 11 12Example: 13 14pcf8523: rtc@68 { 15 compatible = "nxp,pcf8523"; 16 reg = <0x68>; 17 quartz-load-femtofarads = <7000>; 18}; 19