[PATCH v2 2/2] arm64: dts: rockchip: support CAN1-CAN2-UART4 adapter for RK3588 Jaguar

[Quentin Schulz <foss+kernel@0leil.net>]

From: Quentin Schulz <quentin.schulz@cherry.de>

RK3588 Jaguar has a proprietary Mezzanine connector which exposes among
other things CAN1 and CAN2 controllers as well as UART4.

Add support for the CAN1-CAN2-UART4 Mezzanine adapter for RK3588 Jaguar
which exposes two CAN busses (CAN1 and CAN2) and an RS-232 UART, limited
to 250Kbps.

Signed-off-by: Quentin Schulz <quentin.schulz@cherry.de>
---
 arch/arm64/boot/dts/rockchip/Makefile              |  4 ++++
 .../rockchip/rk3588-jaguar-can1-can2-uart4.dtso    | 26 ++++++++++++++++++++++
 arch/arm64/boot/dts/rockchip/rk3588-jaguar.dts     | 10 +++++++++
 3 files changed, 40 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/Makefile b/arch/arm64/boot/dts/rockchip/Makefile
index 761d82b4f4f2a..11c96e06b122a 100644
--- a/arch/arm64/boot/dts/rockchip/Makefile
+++ b/arch/arm64/boot/dts/rockchip/Makefile
@@ -307,6 +307,10 @@ dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-edgeble-neu6b-wifi.dtb
 rk3588-edgeble-neu6b-wifi-dtbs := rk3588-edgeble-neu6b-io.dtb \
 	rk3588-edgeble-neu6a-wifi.dtbo
 
+dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-jaguar-can1-can2-uart4.dtb
+rk3588-jaguar-can1-can2-uart4-dtbs := rk3588-jaguar.dtb \
+	rk3588-jaguar-can1-can2-uart4.dtbo
+
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-jaguar-ethernet-switch.dtb
 rk3588-jaguar-ethernet-switch-dtbs := rk3588-jaguar.dtb \
 	rk3588-jaguar-ethernet-switch.dtbo
diff --git a/arch/arm64/boot/dts/rockchip/rk3588-jaguar-can1-can2-uart4.dtso b/arch/arm64/boot/dts/rockchip/rk3588-jaguar-can1-can2-uart4.dtso
new file mode 100644
index 0000000000000..6c21bf78591b3
--- /dev/null
+++ b/arch/arm64/boot/dts/rockchip/rk3588-jaguar-can1-can2-uart4.dtso
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2026 Cherry Embedded Solutions GmbH
+ *
+ * Device Tree Overlay for CAN1-CAN2-UART4 adapter for the Mezzanine connector
+ * on RK3588 Jaguar.
+ *
+ * This adapter has two CAN transceivers and one RS232 transceiver.
+ */
+
+/dts-v1/;
+/plugin/;
+
+&can1 {
+	status = "okay";
+};
+
+&can2 {
+	status = "okay";
+};
+
+/* RS232 */
+&uart4 {
+	/* ST3232B only guarantees 250Kbps */
+	status = "okay";
+};
diff --git a/arch/arm64/boot/dts/rockchip/rk3588-jaguar.dts b/arch/arm64/boot/dts/rockchip/rk3588-jaguar.dts
index ed6c1162bd821..0446834e84d5d 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588-jaguar.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3588-jaguar.dts
@@ -201,6 +201,16 @@ &can0 {
 	status = "okay";
 };
 
+&can1 {
+	assigned-clocks = <&cru CLK_CAN1>;
+	assigned-clock-rates = <300000000>;
+};
+
+&can2 {
+	assigned-clocks = <&cru CLK_CAN2>;
+	assigned-clock-rates = <300000000>;
+};
+
 &combphy1_ps {
 	status = "okay";
 };

-- 
2.55.0