riscv: Add AST2700 SoC initial platform support
AST2700 SoCs integrates a Ibex 32-bits RISC-V core as the boot MCU
for the first stage bootloader execution, namely SPL.
This patch implements the preliminary base to successfully run SPL
on this RV32-based MCU to the console banner message.
Signed-off-by: Chia-Wei Wang <chiawei_wang@aspeedtech.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
diff --git a/arch/riscv/dts/ast2700.dtsi b/arch/riscv/dts/ast2700.dtsi
new file mode 100644
index 0000000..9b482df
--- /dev/null
+++ b/arch/riscv/dts/ast2700.dtsi
@@ -0,0 +1,76 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/ {
+ model = "Aspeed AST2700 Ibex BootMCU";
+ compatible = "aspeed,ast2700-ibex";
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ cpus {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ cpu@0 {
+ compatible = "lowrisc,ibex";
+ device_type = "cpu";
+ reg = <0>;
+ comptaible = "riscv";
+ riscv,isa = "rv32imc";
+ };
+ };
+
+ memory@80000000 {
+ reg = <0x80000000 0x80000000>;
+ };
+
+ soc0: soc@12000000 {
+ compatible = "aspeed,soc1","simple-bus";
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges;
+
+ sdrammc: sdrammc@12c00000 {
+ compatible = "aspeed,ast2700-sdrammc";
+ reg = <0x12c00000 0x3000>, <0x13000000 0x1000>;
+ aspeed,scu0 = <&syscon0>;
+ aspeed,scu1 = <&syscon1>;
+ };
+
+ syscon0: syscon@12c02000 {
+ compatible = "aspeed,ast2700-scu0", "syscon", "simple-mfd";
+ reg = <0x12c02000 0x1000>;
+ ranges = <0 0x12c02000 0x1000>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+ };
+ };
+
+ soc1: soc@14000000 {
+ compatible = "aspeed,soc1","simple-bus";
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges;
+
+ syscon1: syscon@14c02000 {
+ compatible = "aspeed,ast2700-scu1", "syscon", "simple-mfd";
+ reg = <0x14c02000 0x1000>;
+ ranges = <0 0x14c02000 0x1000>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+ };
+
+ uart12: serial@14c33b00 {
+ compatible = "ns16550a";
+ reg = <0x14c33b00 0x20>;
+ reg-shift = <2>;
+ no-loopback-test;
+ clock-frequency = <1846153>;
+ status = "disabled";
+ };
+
+ ast_ibex_timer: timer {
+ compatible = "aspeed,ast2700-ibex-timer";
+ clock-frequency = <200000000>;
+ };
+ };
+};