Hello Krzysztof,


Krzysztof Kozlowski wrote:

On 20.10.2015 01:11, Tobias Jakobi wrote:

quoted

Hello Krzysztof,

I can confirm that this also works on a Odroid-X2, so I guess it's safe
to enable the PRNG for all Exynos4412-based Odroid devices.

Sure, I can send a patch for that. I can test it later also on Odroid-U3.

Thanks already!

quoted

Any chance that you might also take a look at the other hwcrypto stuff
on the SoC ('samsung,exynos4210-secss' compatible)?

What do you mean? The s5p-sss driver already supports Device Tree.

The driver supports DT, but it doesn't really work.

I'm using the following DT entry to let the driver probe correctly:
https://github.com/tobiasjakobi/linux-odroid/commit/82c00cddb5cbf89fad994784c28c8125beae8e13

But the crypto self-test fails on boot:
alg: skcipher: encryption failed on test 1 for ecb-aes-s5p: ret=22


Another problems is that SSS and PRNG can't be used at the same time,
since they both use common hardware resources (I think it was IO).


With best wishes,
Tobias

Best regards,
Krzysztof

quoted

With best wishes,
Tobias


Krzysztof Kozlowski wrote:

quoted

Hi,


The patchset adds necessary clock from Security SubSystem (SSS)
and enables the PRNG module of Exynos for Trats2 board.

The first patch (clock) is required for other ones so please
take everything in one step.

The actual Device Tree support (and compatible) was sent in separate
patch:
 - https://patchwork.kernel.org/patch/7432891/
 - http://marc.info/?l=linux-crypto-vger&m=144522952725052&w=2

The device can be tested (after applying both patchsets) with:
$ echo exynos > /sys/class/misc/hw_random/rng_current
$ dd if=/dev/hwrng of=/dev/null bs=1 count=16


Best regards,
Krzysztof

Krzysztof Kozlowski (3):
  clk: samsung: exynos4: Add SSS gate clock
  ARM: dts: Add PRNG module for exynos4
  ARM: dts: Enable PRNG module on exynos4412-trats2

 arch/arm/boot/dts/exynos4.dtsi          | 8 ++++++++
 arch/arm/boot/dts/exynos4412-trats2.dts | 4 ++++
 drivers/clk/samsung/clk-exynos4.c       | 1 +
 include/dt-bindings/clock/exynos4.h     | 1 +
 4 files changed, 14 insertions(+)