[PATCH] riscv: dts: sophgo: cv18xx: Add RTCSYS device node

[Alexander Sverdlin <alexander.sverdlin@gmail.com>]

Add the RTCSYS MFD node: in Cvitek CV18xx and its successors RTC Subsystem
is quite advanced and provides SoC power management functions as well.

The SoC family also contains DW8051 block (Intel 8051 compatible CPU core)
and an associated SRAM. The corresponding control registers are mapped into
RTCSYS address space as well.

Link: https://github.com/sophgo/sophgo-doc/tree/main/SG200X/TRM
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
---
 arch/riscv/boot/dts/sophgo/cv180x.dtsi | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/riscv/boot/dts/sophgo/cv180x.dtsi b/arch/riscv/boot/dts/sophgo/cv180x.dtsi
index ed06c3609fb2..280c45bd3b3d 100644
--- a/arch/riscv/boot/dts/sophgo/cv180x.dtsi
+++ b/arch/riscv/boot/dts/sophgo/cv180x.dtsi
@@ -307,5 +307,17 @@ dmac: dma-controller@4330000 {
 			snps,data-width = <2>;
 			status = "disabled";
 		};
+
+		rtc@5025000 {
+			compatible = "sophgo,cv1800b-rtc", "syscon";
+			reg = <0x5025000 0x2000>;
+			interrupts = <SOC_PERIPHERAL_IRQ(1) IRQ_TYPE_LEVEL_HIGH>,
+				     <SOC_PERIPHERAL_IRQ(2) IRQ_TYPE_LEVEL_HIGH>,
+				     <SOC_PERIPHERAL_IRQ(3) IRQ_TYPE_LEVEL_HIGH>;
+			interrupt-names = "alarm", "longpress", "vbat";
+			clocks = <&clk CLK_RTC_25M>,
+				 <&clk CLK_SRC_RTC_SYS_0>;
+			clock-names = "rtc", "mcu";
+		};
 	};
 };
-- 
2.49.0