Re: [PATCH v8 3/3] arm64: dts: rockchip: add DT entry for RNG to RK356x

[Jason A. Donenfeld]

On Sun, Jul 21, 2024 at 01:48:38AM +0100, Daniel Golle wrote:
> From: Aurelien Jarno <aurelien@xxxxxxxxxxx>
> 
> Enable the just added Rockchip RNG driver for RK356x SoCs.
> 
> Signed-off-by: Aurelien Jarno <aurelien@xxxxxxxxxxx>
> Signed-off-by: Daniel Golle <daniel@xxxxxxxxxxxxxx>
> ---
>  arch/arm64/boot/dts/rockchip/rk3568.dtsi |  7 +++++++
>  arch/arm64/boot/dts/rockchip/rk356x.dtsi | 10 ++++++++++
>  2 files changed, 17 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3568.dtsi b/arch/arm64/boot/dts/rockchip/rk3568.dtsi
> index f1be76a54ceb..b9c6b2dc87fa 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3568.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk3568.dtsi
> @@ -257,6 +257,13 @@ power-domain@RK3568_PD_PIPE {
>  	};
>  };
>  
> +&rng {
> +	rockchip,sample-count = <1000>;
> +	quality = <900>;

As I already wrote you for v7, quality is out of 1024, not 1000, so this
won't hit 90% as you intend.

But also, I think putting this in the DT is a mistake. Other drivers
don't generally do this, and if the hardware is actually the same piece
to piece (it is...), then there's not per-manufactured unit tweaking
needed. So keep this in the actual driver C like other drivers.

Jason