ARM: dts: meson8b: odroid-c1: prepare support for the RTC

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.blumenstingl@googlemail.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>

diff --git a/arch/arm/boot/dts/meson8b-odroidc1.dts b/arch/arm/boot/dts/meson8b-odroidc1.dts
index 0157646..f3ad939 100644 (file)
--- 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>;