[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/