linux-kernel - [PATCH v7 4/4] riscv: dts: add clock generator for Sophgo SG2042 SoC

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Message-Id: <25650372c373b15309cd9f3822306838e556d3c7.1704694903.git.unicorn_wang@outlook.com>
Date: Mon,  8 Jan 2024 14:49:53 +0800
From: Chen Wang <unicornxw@...il.com>
To: aou@...s.berkeley.edu,
	chao.wei@...hgo.com,
	conor@...nel.org,
	krzysztof.kozlowski+dt@...aro.org,
	mturquette@...libre.com,
	palmer@...belt.com,
	paul.walmsley@...ive.com,
	richardcochran@...il.com,
	robh+dt@...nel.org,
	sboyd@...nel.org,
	devicetree@...r.kernel.org,
	linux-clk@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	haijiao.liu@...hgo.com,
	xiaoguang.xing@...hgo.com,
	guoren@...nel.org,
	jszhang@...nel.org,
	inochiama@...look.com,
	samuel.holland@...ive.com
Cc: Chen Wang <unicorn_wang@...look.com>
Subject: [PATCH v7 4/4] riscv: dts: add clock generator for Sophgo SG2042 SoC

From: Chen Wang <unicorn_wang@...look.com>

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

Signed-off-by: Chen Wang <unicorn_wang@...look.com>
---
 .../boot/dts/sophgo/sg2042-milkv-pioneer.dts  |  4 ++++
 arch/riscv/boot/dts/sophgo/sg2042.dtsi        | 23 +++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/arch/riscv/boot/dts/sophgo/sg2042-milkv-pioneer.dts b/arch/riscv/boot/dts/sophgo/sg2042-milkv-pioneer.dts
index 49b4b9c2c101..0b3b3b2b0c64 100644
--- a/arch/riscv/boot/dts/sophgo/sg2042-milkv-pioneer.dts
+++ b/arch/riscv/boot/dts/sophgo/sg2042-milkv-pioneer.dts
@@ -14,6 +14,10 @@ chosen {
 	};
 };
 
+&cgi {
+	clock-frequency = <25000000>;
+};
+
 &uart0 {
 	status = "okay";
 };
diff --git a/arch/riscv/boot/dts/sophgo/sg2042.dtsi b/arch/riscv/boot/dts/sophgo/sg2042.dtsi
index 93256540d078..c9616d111905 100644
--- a/arch/riscv/boot/dts/sophgo/sg2042.dtsi
+++ b/arch/riscv/boot/dts/sophgo/sg2042.dtsi
@@ -5,6 +5,7 @@
 
 /dts-v1/;
 #include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/clock/sophgo,sg2042-clkgen.h>
 
 #include "sg2042-cpus.dtsi"
 
@@ -18,6 +19,12 @@ aliases {
 		serial0 = &uart0;
 	};
 
+	cgi: oscillator {
+		compatible = "fixed-clock";
+		clock-output-names = "cgi";
+		#clock-cells = <0>;
+	};
+
 	soc: soc {
 		compatible = "simple-bus";
 		#address-cells = <2>;
@@ -311,12 +318,28 @@ intc: interrupt-controller@...0000000 {
 			riscv,ndev = <224>;
 		};
 
+		sys_ctrl: system-controller@...0010000 {
+			compatible = "sophgo,sg2042-sysctrl";
+			reg = <0x70 0x30010000 0x0 0x1000>;
+		};
+
+		clkgen: clock-controller@...0012000 {
+			compatible = "sophgo,sg2042-clkgen";
+			reg = <0x70 0x30012000 0x0 0x1000>;
+			sophgo,system-ctrl = <&sys_ctrl>;
+			#clock-cells = <1>;
+			clocks = <&cgi>;
+		};
+
 		uart0: serial@...0000000 {
 			compatible = "snps,dw-apb-uart";
 			reg = <0x00000070 0x40000000 0x00000000 0x00001000>;
 			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>;
 			status = "disabled";
-- 
2.25.1