linux-kernel - Re: [PATCH v2 1/5] riscv: dts: starfive: jh7110-common: replace syscrg clock assignments

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Message-ID: <CAJM55Z-M9MsJAtPi-t=_tNV3oG_kdDiS6H=H3koJwTEwB8GJ-Q@mail.gmail.com>
Date: Wed, 5 Feb 2025 02:16:15 -0800
From: Emil Renner Berthing <emil.renner.berthing@...onical.com>
To: E Shattow <e@...eshell.de>, Conor Dooley <conor@...nel.org>, 
	Emil Renner Berthing <kernel@...il.dk>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Paul Walmsley <paul.walmsley@...ive.com>, 
	Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>
Cc: linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v2 1/5] riscv: dts: starfive: jh7110-common: replace
 syscrg clock assignments

E Shattow wrote:
> Replace syscrg assignments of clocks, clock parents, and rates with
> default settings for compatibility with downstream boot loader SPL
> secondary program loader.
>
> Signed-off-by: E Shattow <e@...eshell.de>
> ---
>  arch/riscv/boot/dts/starfive/jh7110-common.dtsi | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/arch/riscv/boot/dts/starfive/jh7110-common.dtsi b/arch/riscv/boot/dts/starfive/jh7110-common.dtsi
> index 48fb5091b817..a5661b677687 100644
> --- a/arch/riscv/boot/dts/starfive/jh7110-common.dtsi
> +++ b/arch/riscv/boot/dts/starfive/jh7110-common.dtsi
> @@ -359,9 +359,14 @@ spi_dev0: spi@0 {
>  };
>
>  &syscrg {
> -	assigned-clocks = <&syscrg JH7110_SYSCLK_CPU_CORE>,
> -			  <&pllclk JH7110_PLLCLK_PLL0_OUT>;
> -	assigned-clock-rates = <500000000>, <1500000000>;
> +	assigned-clocks = <&syscrg JH7110_SYSCLK_CPU_ROOT>,
> +			  <&syscrg JH7110_SYSCLK_BUS_ROOT>,
> +			  <&syscrg JH7110_SYSCLK_PERH_ROOT>,
> +			  <&syscrg JH7110_SYSCLK_QSPI_REF>;
> +	assigned-clock-parents = <&pllclk JH7110_PLLCLK_PLL0_OUT>,
> +				 <&pllclk JH7110_PLLCLK_PLL2_OUT>,
> +				 <&pllclk JH7110_PLLCLK_PLL2_OUT>,
> +				 <&syscrg JH7110_SYSCLK_QSPI_REF_SRC>;

I think Conor asked about this too, but you still don't write why it's ok to
drop the 500MHz and 1,5GHz assignments to the cpu-core and pll0 clocks
respectively. You should add this to the commit message itself.

/Emil