linux-kernel - Re: [RFC PATCH 1/1] riscv: dts: Allow BUILTIN

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Date: Thu, 22 Feb 2024 21:05:55 +0000
From: Conor Dooley <conor@...nel.org>
To: Yangyu Chen <cyy@...self.name>
Cc: linux-riscv@...ts.infradead.org,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, linux-kernel@...r.kernel.org,
	Masahiro Yamada <masahiroy@...nel.org>,
	Alexandre Ghiti <alex@...ti.fr>, Rob Herring <robh+dt@...nel.org>,
	devicetree@...r.kernel.org
Subject: Re: [RFC PATCH 1/1] riscv: dts: Allow BUILTIN_DTB for all socs

Hey,

On Wed, Feb 21, 2024 at 03:03:57AM +0800, Yangyu Chen wrote:
> The BUILTIN_DTB kernel feature on RISC-V only works on K210 SoC only. This
> patch moved this configuration to entire riscv.
> 
> Signed-off-by: Yangyu Chen <cyy@...self.name>
> ---
>  arch/riscv/Kconfig                  | 16 ++++++++++++++-
>  arch/riscv/Kconfig.socs             | 32 -----------------------------
>  arch/riscv/boot/dts/Makefile        |  2 +-
>  arch/riscv/boot/dts/canaan/Makefile |  2 --
>  4 files changed, 16 insertions(+), 36 deletions(-)
> 
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index b49016bb5077..23d501561e64 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -996,7 +996,21 @@ config RISCV_ISA_FALLBACK
>  config BUILTIN_DTB
>  	bool "Built-in device tree"
>  	depends on OF && NONPORTABLE
> -	default y if XIP_KERNEL
> +	default y if XIP_KERNEL || SOC_CANAAN

s/SOC/ARCH/

> +	help
> +	  Build a device tree into the Linux image.
> +	  This option should be selected if no bootloader is being used.
> +	  If unsure, say Y.
> +
> +
> +config BUILTIN_DTB_SOURCE
> +	string "Built-in device tree source"
> +	depends on BUILTIN_DTB

> +	default "canaan/k210_generic" if SOC_CANAAN

I think we should drop this default, I don't think that "k210_generic"
should really exist in the first place. And suggest that there are
platform-wide default devicetrees isn't something I think should be
encouraged.

> +	help
> +	  DTS file path (without suffix, relative to arch/riscv/boot/dts)
> +	  for the DTS file that will be used to produce the DTB linked into the
> +	  kernel.
>  
>  endmenu # "Boot options"

> -config SOC_CANAAN_K210_DTB_BUILTIN
> -config SOC_CANAAN_K210_DTB_SOURCE

> diff --git a/arch/riscv/boot/dts/canaan/Makefile b/arch/riscv/boot/dts/canaan/Makefile
> index 520623264c87..987d1f0c41f0 100644
> --- a/arch/riscv/boot/dts/canaan/Makefile
> +++ b/arch/riscv/boot/dts/canaan/Makefile
> @@ -5,5 +5,3 @@ dtb-$(CONFIG_ARCH_CANAAN) += sipeed_maix_bit.dtb
>  dtb-$(CONFIG_ARCH_CANAAN) += sipeed_maix_dock.dtb
>  dtb-$(CONFIG_ARCH_CANAAN) += sipeed_maix_go.dtb
>  dtb-$(CONFIG_ARCH_CANAAN) += sipeed_maixduino.dtb
> -
> -obj-$(CONFIG_ARCH_CANAAN_K210_DTB_BUILTIN) += $(addsuffix .dtb.o, $(CONFIG_ARCH_CANAAN_K210_DTB_SOURCE))

There are two more instances of this that need to be removed.

Thanks,
Conor.

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