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From:   Horia Geanta <horia.geanta@nxp.com>
To:     Fabio Estevam <festevam@gmail.com>, Adam Ford <aford173@gmail.com>
CC:     "linux-arm-kernel@lists.infradead.org" 
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        Theodore Ts'o <tytso@mit.edu>
Subject: Re: [PATCH V2 3/3] arm64: defconfig: Enable CRYPTO_DEV_FSL_CAAM
Thread-Topic: [PATCH V2 3/3] arm64: defconfig: Enable CRYPTO_DEV_FSL_CAAM
Thread-Index: AQHVscuAzDa0y7DjIUSGaSZVWPlDjw==
Date:   Fri, 20 Dec 2019 08:07:34 +0000
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On 12/17/2019 8:25 PM, Fabio Estevam wrote:=0A=
> Hi Adam,=0A=
> =0A=
> On Tue, Dec 17, 2019 at 10:07 AM Adam Ford <aford173@gmail.com> wrote:=0A=
> =0A=
>> Out of curiosity, what is the rule for when things are 'm' vs 'y'?=0A=
>>=0A=
>> In the Code Aurora repo, it is set to 'y' and the mainline kernel for=0A=
>> the i.MX6/7, the imx_v6_v7_defconfig is also set to 'y' which is why I=
=0A=
>> used 'y' here.=0A=
>>=0A=
>> I can do a V3 to address the other items you noted, but I want to=0A=
>> understand the rules about the defconfig so I don't make the same=0A=
>> mistake again.=0A=
> =0A=
> In arch/arm64/configs/defconfig we try to select modules whenever possibl=
e.=0A=
> =0A=
> The exceptions are drivers that are vital for boot such as PMIC,=0A=
> pinctrl, clks, etc.=0A=
> =0A=
> The CAAM driver does not fall into this category, so selecting it as=0A=
> module is preferred here.=0A=
> =0A=
One comment here though.=0A=
=0A=
CAAM's RNG is not "vital" for booting, but IIUC it would decrease the boot =
time=0A=
since it feeds the entropy pool through the hwrng interface.=0A=
=0A=
Once RNG driver is fixed, would it be acceptable to add:=0A=
CONFIG_HW_RANDOM=3Dy=0A=
CONFIG_CRYPTO_DEV_FSL_CAAM=3Dy=0A=
in arm64 defconfig?=0A=
=0A=
Thanks,=0A=
Horia=0A=
=0A=