linux-kernel - [PATCH 3/3] arm64: dts: allwinner: t527: orangepi-4a: hook up external 32k crystal

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Message-Id: <20250913102450.3935943-3-wens@kernel.org>
Date: Sat, 13 Sep 2025 18:24:50 +0800
From: Chen-Yu Tsai <wens@...nel.org>
To: Chen-Yu Tsai <wens@...e.org>,
	Jernej Skrabec <jernej@...nel.org>,
	Samuel Holland <samuel@...lland.org>,
	Andre Przywara <andre.przywara@....com>
Cc: linux-sunxi@...ts.linux.dev,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] arm64: dts: allwinner: t527: orangepi-4a: hook up external 32k crystal

From: Chen-Yu Tsai <wens@...e.org>

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: de713ccb9934 ("arm64: dts: allwinner: t527: Add OrangePi 4A board")
Signed-off-by: Chen-Yu Tsai <wens@...e.org>
---
 arch/arm64/boot/dts/allwinner/sun55i-t527-orangepi-4a.dts | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm64/boot/dts/allwinner/sun55i-t527-orangepi-4a.dts b/arch/arm64/boot/dts/allwinner/sun55i-t527-orangepi-4a.dts
index fb5311a46c2e..f71860db83d3 100644
--- a/arch/arm64/boot/dts/allwinner/sun55i-t527-orangepi-4a.dts
+++ b/arch/arm64/boot/dts/allwinner/sun55i-t527-orangepi-4a.dts
@@ -393,6 +393,14 @@ &r_pio {
 	vcc-pm-supply = <&reg_bldo2>;
 };
 
+&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>;
-- 
2.39.5