dt-bindings: rtc: mediatek: add bindings for MediaTek SoC based RTC

Add device-tree binding for MediaTek SoC based RTC

Cc: devicetree@vger.kernel.org
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

diff --git a/Documentation/devicetree/bindings/rtc/rtc-mt7622.txt b/Documentation/devicetree/bindings/rtc/rtc-mt7622.txt
new file mode 100644 (file)
index 0000000..09fe8f5
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/rtc-mt7622.txt
@@ -0,0 +1,21 @@
+Device-Tree bindings for MediaTek SoC based RTC
+
+Required properties:
+- compatible       : Should be
+                       "mediatek,mt7622-rtc", "mediatek,soc-rtc" : for MT7622 SoC
+- reg              : Specifies base physical address and size of the registers;
+- interrupts       : Should contain the interrupt for RTC alarm;
+- clocks           : Specifies list of clock specifiers, corresponding to
+                     entries in clock-names property;
+- clock-names      : Should contain "rtc" entries
+
+Example:
+
+rtc: rtc@10212800 {
+       compatible = "mediatek,mt7622-rtc",
+                    "mediatek,soc-rtc";
+       reg = <0 0x10212800 0 0x200>;
+       interrupts = <GIC_SPI 129 IRQ_TYPE_LEVEL_LOW>;
+       clocks = <&topckgen CLK_TOP_RTC>;
+       clock-names = "rtc";
+};