linux-kernel - Re: [PATCH 5/5] riscv: dts: sophgo: Add LicheeRV Nano board device tree

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Date: Tue, 28 May 2024 06:25:21 +0800
From: Inochi Amaoto <inochiama@...look.com>
To: Thomas Bonnefille <thomas.bonnefille@...tlin.com>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Paul Walmsley <paul.walmsley@...ive.com>, 
	Chen Wang <unicorn_wang@...look.com>, Inochi Amaoto <inochiama@...look.com>, 
	Chao Wei <chao.wei@...hgo.com>
Cc: Albert Ou <aou@...s.berkeley.edu>, Palmer Dabbelt <palmer@...belt.com>, 
	Samuel Holland <samuel.holland@...ive.com>, Thomas Gleixner <tglx@...utronix.de>, 
	Daniel Lezcano <daniel.lezcano@...aro.org>, Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
	Miquèl Raynal <miquel.raynal@...tlin.com>, linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-riscv@...ts.infradead.org
Subject: Re: [PATCH 5/5] riscv: dts: sophgo: Add LicheeRV Nano board device
 tree

On Mon, May 27, 2024 at 12:28:21PM GMT, Thomas Bonnefille wrote:
> LicheeRV Nano [1] is an embedded development platform base on the SOPHGO
> SG2002 chip.
> 
> Add only support for UART.
> 

Although this is OK, I think you can also add sdhci node, it is already
supported.

> Link: https://wiki.sipeed.com/hardware/en/lichee/RV_Nano/1_intro.html
> [1]
> 
> Signed-off-by: Thomas Bonnefille <thomas.bonnefille@...tlin.com>
> ---
>  arch/riscv/boot/dts/sophgo/Makefile                |  1 +
>  .../boot/dts/sophgo/sg2002-lichee-rv-nano.dts      | 25 ++++++++++++++++++++++
>  2 files changed, 26 insertions(+)
> 
> diff --git a/arch/riscv/boot/dts/sophgo/Makefile b/arch/riscv/boot/dts/sophgo/Makefile
> index 57ad82a61ea6..5759b21805dc 100644
> --- a/arch/riscv/boot/dts/sophgo/Makefile
> +++ b/arch/riscv/boot/dts/sophgo/Makefile
> @@ -1,4 +1,5 @@
>  # SPDX-License-Identifier: GPL-2.0
>  dtb-$(CONFIG_ARCH_SOPHGO) += cv1800b-milkv-duo.dtb
>  dtb-$(CONFIG_ARCH_SOPHGO) += cv1812h-huashan-pi.dtb
> +dtb-$(CONFIG_ARCH_SOPHGO) += sg2002-licheerv-nano.dtb
>  dtb-$(CONFIG_ARCH_SOPHGO) += sg2042-milkv-pioneer.dtb
> diff --git a/arch/riscv/boot/dts/sophgo/sg2002-lichee-rv-nano.dts b/arch/riscv/boot/dts/sophgo/sg2002-lichee-rv-nano.dts
> new file mode 100644
> index 000000000000..aaad2733801b
> --- /dev/null
> +++ b/arch/riscv/boot/dts/sophgo/sg2002-lichee-rv-nano.dts
> @@ -0,0 +1,25 @@
> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +/*
> + * Copyright (C) 2024 Thomas Bonnefille <thomas.bonnefille@...tlin.com>
> + */
> +
> +/dts-v1/;
> +
> +#include "sg2002.dtsi"
> +
> +/ {
> +	model = "LicheeRV Nano";
> +	compatible = "sipeed,licheerv-nano", "sophgo,sg2002";

Use the right version, rv nano have several versions with different 
peripherals. The compatible is good for the common file, but not the 
specific board.

> +
> +	aliases {
> +		serial0 = &uart0;
> +	};
> +
> +	chosen {
> +		stdout-path = "serial0:115200n8";
> +	};

It is also better to add all already support nodes, such as gpio, 
other uart port.

> +};
> +
> +&uart0 {
> +	status = "okay";
> +};
> 
> -- 
> 2.45.1
>