riscv: dts: spacemit: Add Milk-V Jupiter board device tree

Add initial support for the Milk-V Jupiter board [1], which is a Mini ITX
computer based on the SpacemiT K1/M1 Octa-Core X60 64-bit RISC-V SoC [2].

There are two variant for this board, one using the K1 chip and another
using the M1 chip. The main difference is that the M1 can run at a higher
frequency than the K1, thanks to its packaging.

For now, only a DTS for the K1 variant is added since there isn't support
yet for the X60 cores operating performance and thermal trip points.

The support is minimal, but at least allows to boot into a serial console.

Link: https://milkv.io/jupiter
Link: https://www.spacemit.com/en/key-stone-k1
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Yixun Lan <dlan@gentoo.org>
Link: https://lore.kernel.org/r/20250214151700.666544-3-javierm@redhat.com
Signed-off-by: Yixun Lan <dlan@gentoo.org>

diff --git a/arch/riscv/boot/dts/spacemit/Makefile b/arch/riscv/boot/dts/spacemit/Makefile
index ac617319a5742a8ec9277ed61317f5475b52e4d4..92e13ce1c16d552d988ffc6a25b115f2a793019c 100644 (file)
--- a/arch/riscv/boot/dts/spacemit/Makefile
+++ b/arch/riscv/boot/dts/spacemit/Makefile
@@ -1,2 +1,3 @@
 # SPDX-License-Identifier: GPL-2.0
 dtb-$(CONFIG_ARCH_SPACEMIT) += k1-bananapi-f3.dtb
+dtb-$(CONFIG_ARCH_SPACEMIT) += k1-milkv-jupiter.dtb

diff --git a/arch/riscv/boot/dts/spacemit/k1-milkv-jupiter.dts b/arch/riscv/boot/dts/spacemit/k1-milkv-jupiter.dts
new file mode 100644 (file)
index 0000000..4483192
--- /dev/null
+++ b/arch/riscv/boot/dts/spacemit/k1-milkv-jupiter.dts
@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: GPL-2.0 OR MIT
+/*
+ * Copyright (C) 2024 Yangyu Chen <cyy@cyyself.name>
+ * Copyright (C) 2025 Javier Martinez Canillas <javierm@redhat.com>
+ */
+
+#include "k1.dtsi"
+#include "k1-pinctrl.dtsi"
+
+/ {
+       model = "Milk-V Jupiter (K1)";
+       compatible = "milkv,jupiter", "spacemit,k1";
+
+       aliases {
+               serial0 = &uart0;
+       };
+
+       chosen {
+               stdout-path = "serial0";
+       };
+};
+
+&uart0 {
+       pinctrl-names = "default";
+       pinctrl-0 = <&uart0_2_cfg>;
+       status = "okay";
+};