The Odroid-C1 has the 32.768 kHz oscillator (X3 in the schematics) which
is required for the RTC. A battery can be connected separately (to the
BT1 header) - then the "rtc" node can be enabled manually. By default
the RTC is disabled because the boards typically come without the RTC
battery.
Signed-off-by: Martin Blumenstingl <martin.blumensti...@googlemail.com>
---
arch/arm/boot/dts/meson8b-odroidc1.dts | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/arch/arm/boot/dts/meson8b-odroidc1.dts
b/arch/arm/boot/dts/meson8b-odroidc1.dts
index 0157646e3a89..f3ad9397f670 100644
--- a/arch/arm/boot/dts/meson8b-odroidc1.dts
+++ b/arch/arm/boot/dts/meson8b-odroidc1.dts
@@ -124,6 +124,14 @@
io-channels = <&saradc 8>;
};
+ rtc32k_xtal: rtc32k-xtal-clk {
+ /* X3 in the schematics */
+ compatible = "fixed-clock";
+ clock-frequency = <32768>;
+ clock-output-names = "RTC32K";
+ #clock-cells = <0>;
+ };
+
vcc_1v8: regulator-vcc-1v8 {
/*
* RICHTEK RT9179 configured for a fixed output voltage of
@@ -345,6 +353,12 @@
clock-names = "clkin0";
};
+&rtc {
+ /* needs to be enabled manually when a battery is connected */
+ clocks = <&rtc32k_xtal>;
+ vdd-supply = <&vdd_rtc>;
+};
+
&uart_AO {
status = "okay";
pinctrl-0 = <&uart_ao_a_pins>;
--
2.21.0
