[v2,0/5] Add Milk-V Duo board support

Milk-V Duo[1] board is an embedded development platform based on the
CV1800B[2] chip. Add minimal device tree files for the development board.
Currently, now it's supported to boot to a basic shell.

NOTE: this series is based on the SG2042 upstream series[3] for the vendor
prefix and ARCH_SOPHGO option.

Link: https://milkv.io/duo [1]
Link: https://en.sophgo.com/product/introduce/cv180xB.html [2]
Link: https://lore.kernel.org/linux-riscv/cover.1696433229.git.unicorn_wang@outlook.com/ [3]

since v1:
 - fix dtbs_check warning
 - add clint node
 - sort dts in Makefile

Jisheng Zhang (5):
  dt-bindings: interrupt-controller: Add SOPHGO CV1800B plic
  dt-bindings: timer: Add SOPHGO CV1800B clint
  dt-bindings: riscv: Add Milk-V Duo board compatibles
  riscv: dts: sophgo: add initial CV1800B SoC device tree
  riscv: dts: sophgo: add Milk-V Duo board device tree

 .../sifive,plic-1.0.0.yaml                    |   1 +
 .../devicetree/bindings/riscv/sophgo.yaml     |   4 +
 .../bindings/timer/sifive,clint.yaml          |   1 +
 arch/riscv/boot/dts/sophgo/Makefile           |   2 +-
 .../boot/dts/sophgo/cv1800b-milkv-duo.dts     |  38 ++++++
 arch/riscv/boot/dts/sophgo/cv1800b.dtsi       | 123 ++++++++++++++++++
 6 files changed, 168 insertions(+), 1 deletion(-)
 create mode 100644 arch/riscv/boot/dts/sophgo/cv1800b-milkv-duo.dts
 create mode 100644 arch/riscv/boot/dts/sophgo/cv1800b.dtsi

From: Conor Dooley <conor.dooley@microchip.com>

On Fri, 06 Oct 2023 20:14:44 +0800, Jisheng Zhang wrote:
> Milk-V Duo[1] board is an embedded development platform based on the
> CV1800B[2] chip. Add minimal device tree files for the development board.
> Currently, now it's supported to boot to a basic shell.
> 
> NOTE: this series is based on the SG2042 upstream series[3] for the vendor
> prefix and ARCH_SOPHGO option.
> 
> [...]

These look grand to me, so I have applied them on a temp. basis to a
"sophgo" branch. I'll merge it in for real to the riscv-dt-for-next if
my changes to the prereq series for the sg2042 are acceptable to their
authors.

[1/5] dt-bindings: interrupt-controller: Add SOPHGO CV1800B plic
      https://git.kernel.org/conor/c/101276d77e84
[2/5] dt-bindings: timer: Add SOPHGO CV1800B clint
      https://git.kernel.org/conor/c/a3a24243b83b
[3/5] dt-bindings: riscv: Add Milk-V Duo board compatibles
      https://git.kernel.org/conor/c/533874200f8c
[4/5] riscv: dts: sophgo: add initial CV1800B SoC device tree
      https://git.kernel.org/conor/c/4e31e0e61845
[5/5] riscv: dts: sophgo: add Milk-V Duo board device tree
      https://git.kernel.org/conor/c/0edd1de88d35

Thanks,
Conor.

On 2023/10/6 20:14, Jisheng Zhang wrote:
> Milk-V Duo[1] board is an embedded development platform based on the
> CV1800B chip. Add minimal device tree files for the development board.
>
> Support basic uart drivers, so supports booting to a basic shell.
>
> Link: https://milkv.io/duo [1]
> Signed-off-by: Jisheng Zhang <jszhang@kernel.org>

Acked-by: Chen Wang <unicorn_wang@outlook.com>

Thanks, Chen

> ---
>   arch/riscv/boot/dts/sophgo/Makefile           |  2 +-
>   .../boot/dts/sophgo/cv1800b-milkv-duo.dts     | 38 +++++++++++++++++++
>   2 files changed, 39 insertions(+), 1 deletion(-)
>   create mode 100644 arch/riscv/boot/dts/sophgo/cv1800b-milkv-duo.dts
>
> diff --git a/arch/riscv/boot/dts/sophgo/Makefile b/arch/riscv/boot/dts/sophgo/Makefile
> index 5a471b19df22..3fb65512c631 100644
> --- a/arch/riscv/boot/dts/sophgo/Makefile
> +++ b/arch/riscv/boot/dts/sophgo/Makefile
> @@ -1,3 +1,3 @@
>   # SPDX-License-Identifier: GPL-2.0
> +dtb-$(CONFIG_ARCH_SOPHGO) += cv1800b-milkv-duo.dtb
>   dtb-$(CONFIG_ARCH_SOPHGO) += sg2042-milkv-pioneer.dtb
> -
> diff --git a/arch/riscv/boot/dts/sophgo/cv1800b-milkv-duo.dts b/arch/riscv/boot/dts/sophgo/cv1800b-milkv-duo.dts
> new file mode 100644
> index 000000000000..3af9e34b3bc7
> --- /dev/null
> +++ b/arch/riscv/boot/dts/sophgo/cv1800b-milkv-duo.dts
> @@ -0,0 +1,38 @@
> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +/*
> + * Copyright (C) 2023 Jisheng Zhang <jszhang@kernel.org>
> + */
> +
> +/dts-v1/;
> +
> +#include "cv1800b.dtsi"
> +
> +/ {
> +	model = "Milk-V Duo";
> +	compatible = "milkv,duo", "sophgo,cv1800b";
> +
> +	aliases {
> +		serial0 = &uart0;
> +		serial1 = &uart1;
> +		serial2 = &uart2;
> +		serial3 = &uart3;
> +		serial4 = &uart4;
> +	};
> +
> +	chosen {
> +		stdout-path = "serial0:115200n8";
> +	};
> +
> +	memory@80000000 {
> +		device_type = "memory";
> +		reg = <0x80000000 0x3f40000>;
> +	};
> +};
> +
> +&osc {
> +	clock-frequency = <25000000>;
> +};
> +
> +&uart0 {
> +	status = "okay";
> +};