Document the DT bindings for the rtc-v3020 driver. MMIO and GPIO
attachment modes are both supported via DT.
Signed-off-by: Brandon Martin <martinbv@xxxxxxxxxxxxxx>
---
.../devicetree/bindings/rtc/rtc-v3020.txt | 38 ++++++++++++++++++++++
1 file changed, 38 insertions(+)
create mode 100644 Documentation/devicetree/bindings/rtc/rtc-v3020.txt
diff --git a/Documentation/devicetree/bindings/rtc/rtc-v3020.txt b/Documentation/devicetree/bindings/rtc/rtc-v3020.txt
new file mode 100644
index 000000000000..8b32e6a79960
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/rtc-v3020.txt
@@ -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>;
+ };
--
2.11.0
--
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