linux-kernel - Re: [PATCH 4/5] openrisc: dts: Split simple smp dts to dts and dtsi

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Message-ID: <20251215-graffiti-baritone-4eb0a9f58ab6@spud>
Date: Mon, 15 Dec 2025 16:58:41 +0000
From: Conor Dooley <conor@...nel.org>
To: Stafford Horne <shorne@...il.com>
Cc: LKML <linux-kernel@...r.kernel.org>,
	Linux OpenRISC <linux-openrisc@...r.kernel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Jonas Bonn <jonas@...thpole.se>,
	Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
	Masahiro Yamada <masahiroy@...nel.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH 4/5] openrisc: dts: Split simple smp dts to dts and dtsi

On Sun, Dec 14, 2025 at 06:01:44PM +0000, Stafford Horne wrote:
> Split out the common memory, CPU and PIC definitions of the simple SMP
> system to a DTSI file which we will later use for our De0 Nano multicore
> board device tree.  We also take this opportunity to swich underscores
> to dashes as that seems to be the more common convention for DTS files.
> 
> Signed-off-by: Stafford Horne <shorne@...il.com>
> ---
>  arch/openrisc/boot/dts/simple-smp.dts         | 25 +++++++++++++++++++
>  .../dts/{simple_smp.dts => simple-smp.dtsi}   | 12 ++++-----
>  arch/openrisc/configs/simple_smp_defconfig    |  2 +-
>  3 files changed, 32 insertions(+), 7 deletions(-)
>  create mode 100644 arch/openrisc/boot/dts/simple-smp.dts
>  rename arch/openrisc/boot/dts/{simple_smp.dts => simple-smp.dtsi} (89%)
> 
> diff --git a/arch/openrisc/boot/dts/simple-smp.dts b/arch/openrisc/boot/dts/simple-smp.dts
> new file mode 100644
> index 000000000000..174c2613c419
> --- /dev/null
> +++ b/arch/openrisc/boot/dts/simple-smp.dts
> @@ -0,0 +1,25 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +/dts-v1/;
> +
> +#include "simple_smp.dtsi"
> +
> +/ {
> +	model = "Simple SMP Board";
> +};
> +
> +&cpu0 {
> +	clock-frequency = <20000000>;
> +};
> +
> +&cpu1 {
> +	clock-frequency = <20000000>;
> +};
> +
> +&serial0 {
> +	clock-frequency = <20000000>;
> +};
> +
> +&enet0 {
> +	status = "okay";
> +};
> diff --git a/arch/openrisc/boot/dts/simple_smp.dts b/arch/openrisc/boot/dts/simple-smp.dtsi
> similarity index 89%
> rename from arch/openrisc/boot/dts/simple_smp.dts
> rename to arch/openrisc/boot/dts/simple-smp.dtsi
> index 71af0e117bfe..92770bb6fcf7 100644
> --- a/arch/openrisc/boot/dts/simple_smp.dts
> +++ b/arch/openrisc/boot/dts/simple-smp.dtsi
> @@ -1,4 +1,3 @@
> -/dts-v1/;
>  / {
>  	compatible = "opencores,or1ksim";
>  	#address-cells = <1>;
> @@ -22,15 +21,15 @@ memory@0 {
>  	cpus {
>  		#address-cells = <1>;
>  		#size-cells = <0>;
> -		cpu@0 {
> +		cpu0: cpu@0 {
>  			compatible = "opencores,or1200-rtlsvn481";
>  			reg = <0>;
> -			clock-frequency = <20000000>;
> +			clock-frequency = <0>;

Delete these lines, don't set them to zero please.

>  		};
> -		cpu@1 {
> +		cpu1: cpu@1 {
>  			compatible = "opencores,or1200-rtlsvn481";
>  			reg = <1>;
> -			clock-frequency = <20000000>;
> +			clock-frequency = <0>;
>  		};
>  	};
>  
> @@ -57,7 +56,7 @@ serial0: serial@...00000 {
>  		compatible = "opencores,uart16550-rtlsvn105", "ns16550a";
>  		reg = <0x90000000 0x100>;
>  		interrupts = <2>;
> -		clock-frequency = <20000000>;
> +		clock-frequency = <0>;
>  	};
>  
>  	enet0: ethoc@...00000 {
> @@ -65,5 +64,6 @@ enet0: ethoc@...00000 {
>  		reg = <0x92000000 0x800>;
>  		interrupts = <4>;
>  		big-endian;
> +		status = "disabled";
>  	};
>  };
> diff --git a/arch/openrisc/configs/simple_smp_defconfig b/arch/openrisc/configs/simple_smp_defconfig
> index 6008e824d31c..db77c795225e 100644
> --- a/arch/openrisc/configs/simple_smp_defconfig
> +++ b/arch/openrisc/configs/simple_smp_defconfig
> @@ -20,7 +20,7 @@ CONFIG_SLUB=y
>  CONFIG_SLUB_TINY=y
>  CONFIG_MODULES=y
>  # CONFIG_BLOCK is not set
> -CONFIG_BUILTIN_DTB_NAME="simple_smp"
> +CONFIG_BUILTIN_DTB_NAME="simple-smp"
>  CONFIG_SMP=y
>  CONFIG_HZ_100=y
>  CONFIG_OPENRISC_HAVE_SHADOW_GPRS=y
> -- 
> 2.51.0
> 

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