[PATCH] arm64: dts: rockchip: enable rng on all rk356x

[PATCH] arm64: dts: rockchip: enable rng on all rk356x

[Peter Robinson]

The rk356x rng is available on both the rk3566 and rk3568
parts, the IP is all self contained within the SoCs so
it's enabled already by default on rk3568 so let's enable
it in the base rk356x.dtsi so it's enabled consistently
everywhere.

Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
---
 arch/arm64/boot/dts/rockchip/rk3568.dtsi      | 4 ----
 arch/arm64/boot/dts/rockchip/rk356x-base.dtsi | 1 -
 2 files changed, 5 deletions(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3568.dtsi b/arch/arm64/boot/dts/rockchip/rk3568.dtsi
index ecaefe208e3e..9dc09db5034d 100644
--- a/arch/arm64/boot/dts/rockchip/rk3568.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3568.dtsi
@@ -397,10 +397,6 @@ power-domain@RK3568_PD_PIPE {
 	};
 };
 
-&rng {
-	status = "okay";
-};
-
 &usb_host0_xhci {
 	phys = <&usb2phy0_otg>, <&combphy0 PHY_TYPE_USB3>;
 	phy-names = "usb2-phy", "usb3-phy";
diff --git a/arch/arm64/boot/dts/rockchip/rk356x-base.dtsi b/arch/arm64/boot/dts/rockchip/rk356x-base.dtsi
index 62be06f3b863..2994cddb3464 100644
--- a/arch/arm64/boot/dts/rockchip/rk356x-base.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk356x-base.dtsi
@@ -1038,7 +1038,6 @@ rng: rng@fe388000 {
 		clocks = <&cru CLK_TRNG_NS>, <&cru HCLK_TRNG_NS>;
 		clock-names = "core", "ahb";
 		resets = <&cru SRST_TRNG_NS>;
-		status = "disabled";
 	};
 
 	i2s0_8ch: i2s@fe400000 {
-- 
2.47.1


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Re: [PATCH] arm64: dts: rockchip: enable rng on all rk356x

[Dragan Simic]

Hello Peter,

On 2024-12-02 00:46, Peter Robinson wrote:
> The rk356x rng is available on both the rk3566 and rk3568
> parts, the IP is all self contained within the SoCs so
> it's enabled already by default on rk3568 so let's enable
> it in the base rk356x.dtsi so it's enabled consistently
> everywhere.

Please, go through the mailing list threads [1][2] that have led us
to the current state.  To sum it up, it isn't about what's supported
in the two RK356x SoC variants, but about the RK3566's HWRNG being
disabled because the testing showed that it produces unacceptably
low quality of random data, for some yet unknown reason.

[1] 
https://lore.kernel.org/linux-rockchip/cover.1720969799.git.daniel@makrotopia.org/T/#u
[2] 
https://lore.kernel.org/linux-rockchip/cover.1722355365.git.daniel@makrotopia.org/T/#u

> Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
> ---
>  arch/arm64/boot/dts/rockchip/rk3568.dtsi      | 4 ----
>  arch/arm64/boot/dts/rockchip/rk356x-base.dtsi | 1 -
>  2 files changed, 5 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3568.dtsi
> b/arch/arm64/boot/dts/rockchip/rk3568.dtsi
> index ecaefe208e3e..9dc09db5034d 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3568.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk3568.dtsi
> @@ -397,10 +397,6 @@ power-domain@RK3568_PD_PIPE {
>  	};
>  };
> 
> -&rng {
> -	status = "okay";
> -};
> -
>  &usb_host0_xhci {
>  	phys = <&usb2phy0_otg>, <&combphy0 PHY_TYPE_USB3>;
>  	phy-names = "usb2-phy", "usb3-phy";
> diff --git a/arch/arm64/boot/dts/rockchip/rk356x-base.dtsi
> b/arch/arm64/boot/dts/rockchip/rk356x-base.dtsi
> index 62be06f3b863..2994cddb3464 100644
> --- a/arch/arm64/boot/dts/rockchip/rk356x-base.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk356x-base.dtsi
> @@ -1038,7 +1038,6 @@ rng: rng@fe388000 {
>  		clocks = <&cru CLK_TRNG_NS>, <&cru HCLK_TRNG_NS>;
>  		clock-names = "core", "ahb";
>  		resets = <&cru SRST_TRNG_NS>;
> -		status = "disabled";
>  	};
> 
>  	i2s0_8ch: i2s@fe400000 {

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Re: [PATCH] arm64: dts: rockchip: enable rng on all rk356x

[Marcin Juszkiewicz]

W dniu 2.12.2024 o 04:55, Dragan Simic pisze:
 > On 2024-12-02 00:46, Peter Robinson wrote:
 >> The rk356x rng is available on both the rk3566 and rk3568
 >> parts, the IP is all self contained within the SoCs so
 >> it's enabled already by default on rk3568 so let's enable
 >> it in the base rk356x.dtsi so it's enabled consistently
 >> everywhere.
 >
 > Please, go through the mailing list threads [1][2] that have led us
 > to the current state.  To sum it up, it isn't about what's supported
 > in the two RK356x SoC variants, but about the RK3566's HWRNG being
 > disabled because the testing showed that it produces unacceptably
 > low quality of random data, for some yet unknown reason.

So maybe there should be a comment in rockchip/rk3568.dtsi so we would 
not get back to it again.

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Re: [PATCH] arm64: dts: rockchip: enable rng on all rk356x

[Diederik de Haas]

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On Mon Dec 2, 2024 at 11:40 AM CET, Marcin Juszkiewicz wrote:
> W dniu 2.12.2024 o 04:55, Dragan Simic pisze:
>  > On 2024-12-02 00:46, Peter Robinson wrote:
>  >> The rk356x rng is available on both the rk3566 and rk3568
>  >> parts, the IP is all self contained within the SoCs so
>  >> it's enabled already by default on rk3568 so let's enable
>  >> it in the base rk356x.dtsi so it's enabled consistently
>  >> everywhere.
>  >
>  > Please, go through the mailing list threads [1][2] that have led us
>  > to the current state.  To sum it up, it isn't about what's supported
>  > in the two RK356x SoC variants, but about the RK3566's HWRNG being
>  > disabled because the testing showed that it produces unacceptably
>  > low quality of random data, for some yet unknown reason.
>
> So maybe there should be a comment in rockchip/rk3568.dtsi so we would 
> not get back to it again.

I suggested to put that in the (original) commit message:
https://lore.kernel.org/linux-rockchip/6690040.iosknibmi9@bagend/
precisely because this was quite predictable to happen.

So a +1 on a comment in the dtsi with a link to the discussion in the
commit message.

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Re: [PATCH] arm64: dts: rockchip: enable rng on all rk356x

[Dragan Simic]

Hello Diederik and Marcin,

On 2024-12-02 13:01, Diederik de Haas wrote:
> On Mon Dec 2, 2024 at 11:40 AM CET, Marcin Juszkiewicz wrote:
>> W dniu 2.12.2024 o 04:55, Dragan Simic pisze:
>>  > On 2024-12-02 00:46, Peter Robinson wrote:
>>  >> The rk356x rng is available on both the rk3566 and rk3568
>>  >> parts, the IP is all self contained within the SoCs so
>>  >> it's enabled already by default on rk3568 so let's enable
>>  >> it in the base rk356x.dtsi so it's enabled consistently
>>  >> everywhere.
>>  >
>>  > Please, go through the mailing list threads [1][2] that have led us
>>  > to the current state.  To sum it up, it isn't about what's 
>> supported
>>  > in the two RK356x SoC variants, but about the RK3566's HWRNG being
>>  > disabled because the testing showed that it produces unacceptably
>>  > low quality of random data, for some yet unknown reason.
>> 
>> So maybe there should be a comment in rockchip/rk3568.dtsi so we would
>> not get back to it again.
> 
> I suggested to put that in the (original) commit message:
> https://lore.kernel.org/linux-rockchip/6690040.iosknibmi9@bagend/
> precisely because this was quite predictable to happen.
> 
> So a +1 on a comment in the dtsi with a link to the discussion in the
> commit message.

Totally agreed on adding a brief summary to the RK356x base SoC dtsi,
so I went ahead and sent a patch that adds it. [1]  I also expected
that to be described in the base dtsi back when the HWRNG support was
added, but it somehow went in without the description.

[1] 
https://lore.kernel.org/linux-rockchip/6b272e2f8f916c04b05db50df621659a5a7f29ab.1733149874.git.dsimic@manjaro.org/

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Re: [PATCH] arm64: dts: rockchip: enable rng on all rk356x

[Heiko Stübner]

Am Montag, 2. Dezember 2024, 15:50:07 CET schrieb Dragan Simic:
> Hello Diederik and Marcin,
> 
> On 2024-12-02 13:01, Diederik de Haas wrote:
> > On Mon Dec 2, 2024 at 11:40 AM CET, Marcin Juszkiewicz wrote:
> >> W dniu 2.12.2024 o 04:55, Dragan Simic pisze:
> >>  > On 2024-12-02 00:46, Peter Robinson wrote:
> >>  >> The rk356x rng is available on both the rk3566 and rk3568
> >>  >> parts, the IP is all self contained within the SoCs so
> >>  >> it's enabled already by default on rk3568 so let's enable
> >>  >> it in the base rk356x.dtsi so it's enabled consistently
> >>  >> everywhere.
> >>  >
> >>  > Please, go through the mailing list threads [1][2] that have led us
> >>  > to the current state.  To sum it up, it isn't about what's 
> >> supported
> >>  > in the two RK356x SoC variants, but about the RK3566's HWRNG being
> >>  > disabled because the testing showed that it produces unacceptably
> >>  > low quality of random data, for some yet unknown reason.
> >> 
> >> So maybe there should be a comment in rockchip/rk3568.dtsi so we would
> >> not get back to it again.
> > 
> > I suggested to put that in the (original) commit message:
> > https://lore.kernel.org/linux-rockchip/6690040.iosknibmi9@bagend/
> > precisely because this was quite predictable to happen.
> > 
> > So a +1 on a comment in the dtsi with a link to the discussion in the
> > commit message.
> 
> Totally agreed on adding a brief summary to the RK356x base SoC dtsi,
> so I went ahead and sent a patch that adds it. [1]  I also expected
> that to be described in the base dtsi back when the HWRNG support was
> added, but it somehow went in without the description.

thanks a lot for doing that, so I'll drop this patch here now from my inbox.


Heiko



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