arm64: dts: allwinner: t527: avaota-a1: hook up external 32k crystal

When the board was added, its external 32.768 KHz crystal was described
but not hooked up correctly. This meant the device had to fall back to
the SoC's internal oscillator or divide a 32 KHz clock from the main
oscillator, neither of which are accurate for the RTC. As a result the
RTC clock will drift badly.

Hook the crystal up to the RTC block and request the correct clock rate.

Fixes: dbe54efa32af ("arm64: dts: allwinner: a523: add Avaota-A1 router support")
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://patch.msgid.link/20250913102450.3935943-2-wens@kernel.org
Signed-off-by: Chen-Yu Tsai <wens@csie.org>

diff --git a/arch/arm64/boot/dts/allwinner/sun55i-t527-avaota-a1.dts b/arch/arm64/boot/dts/allwinner/sun55i-t527-avaota-a1.dts
index e7713678208d444d0da2a03a27c437de6be76750..4e71055fbd159d68e09182a7eab35322f67566fe 100644 (file)
--- a/arch/arm64/boot/dts/allwinner/sun55i-t527-avaota-a1.dts
+++ b/arch/arm64/boot/dts/allwinner/sun55i-t527-avaota-a1.dts
@@ -309,6 +309,14 @@
        vcc-pm-supply = <&reg_aldo3>;
 };
 
+&rtc {
+       clocks = <&r_ccu CLK_BUS_R_RTC>, <&osc24M>,
+                <&r_ccu CLK_R_AHB>, <&ext_osc32k>;
+       clock-names = "bus", "hosc", "ahb", "ext-osc32k";
+       assigned-clocks = <&rtc CLK_OSC32K>;
+       assigned-clock-rates = <32768>;
+};
+
 &uart0 {
        pinctrl-names = "default";
        pinctrl-0 = <&uart0_pb_pins>;