linux-kernel - Re: [PATCH 1/2] dt-bindings: crypto: qcom,prng: document SM8550

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Date:   Thu, 24 Aug 2023 05:02:29 +0530
From:   Om Prakash Singh <quic_omprsing@...cinc.com>
To:     <neil.armstrong@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Vinod Koul <vkoul@...nel.org>
CC:     <linux-arm-msm@...r.kernel.org>, <linux-crypto@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] dt-bindings: crypto: qcom,prng: document SM8550



On 8/23/2023 1:25 PM, Neil Armstrong wrote:
> Hi,
> 
> On 23/08/2023 02:10, Om Prakash Singh wrote:
>>
>>
>> On 8/22/2023 9:34 PM, Konrad Dybcio wrote:
>>> On 22.08.2023 16:54, Om Prakash Singh wrote:
>>>> PRNG Block on most of newer target from Qualcomm have some 
>>>> configuration where clock is configured by security firmware.
>>>>
>>>> Adding separate compatible string for each platform is overhead.
>>>>
>>>> We need to introduce common compatible string that can be used for 
>>>> all platforms with same configuration.
>>>>
>>>> I would suggest to use "qcom,rng-ee" for newer platform, dropping 
>>>> "p" also signifies it is not a Pseudo Random Number Generator.
>>> Please reply inline and don't top-post.
>>>
>>>
>>> Is this what you're trying to say?
>>>
>>> 1. sort out the clock requirements for designs where Linux manages it
>>>     vs where the FW does so >
>>> 2. introduce a new compatible for SoCs implementing a TRNG
>>>
>>> 3. for SoCs in 2., register the TRNG as a hwrng device
>>
>> Yes to all
> 
> I can send a proposal, but that means writing a new driver for this 
> compatible in drivers/char/hw_random/ right ?

We can add hwrng support in same driver like 
drivers/crypto/hisilicon/trng/trng.c

As Krzysztof is suggesting we need to have platform specific compatible 
string, we can go with your change. for hwrng support I will send 
separate patches.

> 
> Neil
> 
>>
>>>
>>>
>>> ?
>>>
>>> Konrad
>>
>> Thanks,
>> Om
>