[PATCH 1/2] rtc: v3020: Add documentation for DT bindings

@@ -0,0 +1,38 @@
+ EM Micro v3020 RTC
+~~~~~~~~~~~~~~~~~~~~
+
+Required properties:
+  - compatible : "emmicro,v3020"
+
+Required for MMIO connection:
+  - reg : should contain registers location and length.
+
+Required for GPIO connection:
+- emmicro,use-gpio
+- cs-gpios, wr-gpios, rd-gpios, io-gpios : specify gpios connected to
+  corresponding pins of the RTC
+
+Optional properties:
+- emmicro,mmio-left-shift : data bit to which IO line is connected for MMIO
+  connection (defaults to 0)
+
+MMIO Example:
+
+       rtc@70 {
+               ompatible = "emmicro,v3020";
+               reg = <1 0x70 1>;
+               emmicro,mmio-left-shift = <16>; /* IO connected to D16 */
+       };
+
+
+GPIO Example:
+
+       rtc {
+               compatible = "emmicro,v3020";
+
+               emmicro,use-gpio;
+               cs-gpios = <&gpio2 3 0>;
+               wr-gpios = <&gpio2 4 0>;
+               rd-gpios = <&gpio2 5 0>;
+               io-gpios = <&gpio2 6 0>;
+       };