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diff --git a/Documentation/devicetree/bindings/rtc/nxp,rtc-2123.txt b/Documentation/devicetree/bindings/rtc/nxp,rtc-2123.txt
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+++ b/Documentation/devicetree/bindings/rtc/nxp,rtc-2123.txt
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+NXP PCF2123 SPI Real Time Clock
+
+Required properties:
+- compatible: should be: "nxp,pcf2123"
+                      or "microcrystal,rv2123"
+- reg: should be the SPI slave chipselect address
+
+Optional properties:
+- spi-cs-high: PCF2123 needs chipselect high
+
+Example:
+
+pcf2123: rtc@3 {
+	compatible = "nxp,pcf2123"
+	reg = <3>
+	spi-cs-high;
+};