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Subject: Re: [PATCH v2 1/5] dt-bindings: rng: add RNGB compatibles for i.MX6
 SoCs
To:     Rob Herring <robh@kernel.org>
Cc:     Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        Matt Mackall <mpm@selenic.com>,
        Herbert Xu <herbert@gondor.apana.org.au>,
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        Fabio Estevam <festevam@gmail.com>,
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        <linux-arm-kernel@lists.infradead.org>,
        Arnd Bergmann <arnd@arndb.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Martin Kaiser <martin@kaiser.cx>,
        Franck Lenormand <franck.lenormand@nxp.com>,
        Iuliana Prodan <iuliana.prodan@nxp.com>,
        Silvano Di Ninno <silvano.dininno@nxp.com>,
        "linux-crypto@vger.kernel.org" <linux-crypto@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
References: <20200621145658.12528-1-horia.geanta@nxp.com>
 <20200621145658.12528-2-horia.geanta@nxp.com> <20200714000352.GA966545@bogus>
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On 7/14/2020 3:03 AM, Rob Herring wrote:
> On Sun, Jun 21, 2020 at 05:56:54PM +0300, Horia Geantă wrote:
>> RNGB block is found in some i.MX6 SoCs - 6SL, 6SLL, 6ULL, 6ULZ.
>> Add corresponding compatible strings.
>>
>> Note:
>>
>> Several NXP SoC from QorIQ family (P1010, P1023, P4080, P3041, P5020)
>> also have a RNGB, however it's part of the CAAM
>> (Cryptograhic Accelerator and Assurance Module) crypto accelerator.
>> In this case, RNGB is managed in the caam driver
>> (drivers/crypto/caam/), since it's tightly related to
>> the caam "job ring" interface, not to mention CAAM internally relying on
>> RNGB as source of randomness.
>>
>> On the other hand, the i.MX6 SoCs with RNGB have a DCP
>> (Data Co-Processor) crypto accelerator and this block and RNGB
>> are independent.
>>
>> Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
>> ---
>>  Documentation/devicetree/bindings/rng/imx-rng.txt | 3 +++
>>  1 file changed, 3 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/rng/imx-rng.txt b/Documentation/devicetree/bindings/rng/imx-rng.txt
>> index 405c2b00ccb0..eb227db9e684 100644
>> --- a/Documentation/devicetree/bindings/rng/imx-rng.txt
>> +++ b/Documentation/devicetree/bindings/rng/imx-rng.txt
>> @@ -5,6 +5,9 @@ Required properties:
>>                 "fsl,imx21-rnga"
>>                 "fsl,imx31-rnga" (backward compatible with "fsl,imx21-rnga")
>>                 "fsl,imx25-rngb"
>> +               "fsl,imx6sl-rngb"
>> +               "fsl,imx6sll-rngb"
>> +               "fsl,imx6ull-rngb"
> 
> These are all different? IOW, no fallback compatible?
> 
They are compatible with "fsl,imx25-rngb".
I will clarify this in the binding in v3.

Thanks,
Horia