riscv: dts: add clock generator for Sophgo SG2042 SoC

Add clock generator node to device tree for SG2042, and enable clock for
uart.

Signed-off-by: Chen Wang <unicorn_wang@outlook.com>
Reviewed-by: Guo Ren <guoren@kernel.org>

arch/riscv/boot/dts/sophgo/sg2042-milkv-pioneer.dts

@@ -14,6 +14,18 @@
 	};
 };
 
+&cgi_main {
+	clock-frequency = <25000000>;
+};
+
+&cgi_dpll0 {
+	clock-frequency = <25000000>;
+};
+
+&cgi_dpll1 {
+	clock-frequency = <25000000>;
+};
+
 &uart0 {
 	status = "okay";
 };

arch/riscv/boot/dts/sophgo/sg2042.dtsi

@@ -4,8 +4,10 @@
  */
 
 /dts-v1/;
+#include <dt-bindings/clock/sophgo,sg2042-clkgen.h>
+#include <dt-bindings/clock/sophgo,sg2042-pll.h>
+#include <dt-bindings/clock/sophgo,sg2042-rpgate.h>
 #include <dt-bindings/interrupt-controller/irq.h>
-
 #include <dt-bindings/reset/sophgo,sg2042-reset.h>
 
 #include "sg2042-cpus.dtsi"
@@ -20,12 +22,60 @@
 		serial0 = &uart0;
 	};
 
+	cgi_main: oscillator0 {
+		compatible = "fixed-clock";
+		clock-output-names = "cgi_main";
+		#clock-cells = <0>;
+	};
+
+	cgi_dpll0: oscillator1 {
+		compatible = "fixed-clock";
+		clock-output-names = "cgi_dpll0";
+		#clock-cells = <0>;
+	};
+
+	cgi_dpll1: oscillator2 {
+		compatible = "fixed-clock";
+		clock-output-names = "cgi_dpll1";
+		#clock-cells = <0>;
+	};
+
 	soc: soc {
 		compatible = "simple-bus";
 		#address-cells = <2>;
 		#size-cells = <2>;
 		ranges;
 
+		pllclk: clock-controller@70300100c0 {
+			compatible = "sophgo,sg2042-pll";
+			reg = <0x70 0x300100c0 0x0 0x40>;
+			clocks = <&cgi_main>, <&cgi_dpll0>, <&cgi_dpll1>;
+			clock-names = "cgi_main", "cgi_dpll0", "cgi_dpll1";
+			#clock-cells = <1>;
+		};
+
+		rpgate: clock-controller@7030010368 {
+			compatible = "sophgo,sg2042-rpgate";
+			reg = <0x70 0x30010368 0x0 0x98>;
+			clocks = <&clkgen GATE_CLK_RP_CPU_NORMAL>;
+			clock-names = "rpgate";
+			#clock-cells = <1>;
+		};
+
+		clkgen: clock-controller@7030012000 {
+			compatible = "sophgo,sg2042-clkgen";
+			reg = <0x70 0x30012000 0x0 0x1000>;
+			clocks = <&pllclk MPLL_CLK>,
+				 <&pllclk FPLL_CLK>,
+				 <&pllclk DPLL0_CLK>,
+				 <&pllclk DPLL1_CLK>;
+			clock-names = "mpll",
+				      "fpll",
+				      "dpll0",
+				      "dpll1";
+			#clock-cells = <1>;
+		};
+
 		clint_mswi: interrupt-controller@7094000000 {
 			compatible = "sophgo,sg2042-aclint-mswi", "thead,c900-aclint-mswi";
 			reg = <0x00000070 0x94000000 0x00000000 0x00004000>;
@@ -341,6 +391,9 @@
 			interrupt-parent = <&intc>;
 			interrupts = <112 IRQ_TYPE_LEVEL_HIGH>;
 			clock-frequency = <500000000>;
+			clocks = <&clkgen GATE_CLK_UART_500M>,
+				 <&clkgen GATE_CLK_APB_UART>;
+			clock-names = "baudclk", "apb_pclk";
 			reg-shift = <2>;
 			reg-io-width = <4>;
 			resets = <&rstgen RST_UART0>;