linux-kernel - Re: [PATCH v2] arm64: dts: rockchip: Increase maximum frequency of SPI flash for ROCK Pi 4A/B/C

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Date: Sun, 17 Dec 2023 16:18:22 +0100
From: Dragan Simic <dsimic@...jaro.org>
To: Stefan Nagy <stefan.nagy@...psilon.net>
Cc: Heiko Stuebner <heiko@...ech.de>, linux-rockchip@...ts.infradead.org,
 linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] arm64: dts: rockchip: Increase maximum frequency of
 SPI flash for ROCK Pi 4A/B/C

On 2023-12-17 12:32, Stefan Nagy wrote:
> The ROCK Pi 4A/B/C boards come with a 32 Mbit SPI NOR flash chip (XTX
> Technology Limited XT25F32) with a maximum clock frequency of 108 MHz.
> Use this value for the device node's spi-max-frequency property.
> 
> This patch has been tested on ROCK Pi 4A.
> 
> Signed-off-by: Stefan Nagy <stefan.nagy@...psilon.net>

Looks good to me.  It would be nice, if you have time, to include some 
SPI benchmark results before and after the change in the commit message.

Otherwise,

Reviewed-by: Dragan Simic <dsimic@...jaro.org>

> ---
> Changes from v1:
> - Use the maximum clock frequency the SPI chip actually supports
>   instead of the SPI clock frequency limit of 50 MHz set by the
>   Rockchip SPI driver.
> ---
>  arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4a.dts | 2 +-
>  arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4b.dts | 2 +-
>  arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4c.dts | 2 +-
>  3 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4a.dts
> b/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4a.dts
> index d5df8939a..c68f45849 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4a.dts
> +++ b/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4a.dts
> @@ -19,6 +19,6 @@ &spi1 {
>  	flash@0 {
>  		compatible = "jedec,spi-nor";
>  		reg = <0>;
> -		spi-max-frequency = <10000000>;
> +		spi-max-frequency = <108000000>;
>  	};
>  };
> diff --git a/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4b.dts
> b/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4b.dts
> index bee6d7588..6ea3180e5 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4b.dts
> +++ b/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4b.dts
> @@ -37,7 +37,7 @@ &spi1 {
>  	flash@0 {
>  		compatible = "jedec,spi-nor";
>  		reg = <0>;
> -		spi-max-frequency = <10000000>;
> +		spi-max-frequency = <108000000>;
>  	};
>  };
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4c.dts
> b/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4c.dts
> index de2ebe4cb..5274938bf 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4c.dts
> +++ b/arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4c.dts
> @@ -49,7 +49,7 @@ &spi1 {
>  	flash@0 {
>  		compatible = "jedec,spi-nor";
>  		reg = <0>;
> -		spi-max-frequency = <10000000>;
> +		spi-max-frequency = <108000000>;
>  	};
>  };