Re: [PATCH 2/2] hwrng: add support for Airoha EN7581 TRNG

[Christian Marangi]

On Thu, Oct 17, 2024 at 03:11:12PM +0200, Francesco Dolcini wrote:
> On Wed, Oct 16, 2024 at 05:18:42PM +0200, Christian Marangi wrote:
> > Add support for Airoha TRNG. The Airoha SoC provide a True RNG module
> > that can output 4 bytes of raw data at times.
> > 
> > The module makes use of various noise source to provide True Random
> > Number Generation.
> > 
> > On probe the module is reset to operate Health Test and verify correct
> > execution of it.
> > 
> > The module can also provide DRBG function but the execution mode is
> > mutually exclusive, running as TRNG doesn't permit to also run it as
> > DRBG.
> > 
> > Signed-off-by: Christian Marangi <ansuelsmth@xxxxxxxxx>
> > ---
> >  drivers/char/hw_random/Kconfig       |  13 ++
> >  drivers/char/hw_random/Makefile      |   1 +
> >  drivers/char/hw_random/airoha-trng.c | 243 +++++++++++++++++++++++++++
> >  3 files changed, 257 insertions(+)
> >  create mode 100644 drivers/char/hw_random/airoha-trng.c
> > 
> > diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
> > index 5912c2dd6398..bda283f290bc 100644
> > --- a/drivers/char/hw_random/Kconfig
> > +++ b/drivers/char/hw_random/Kconfig
> > @@ -62,6 +62,19 @@ config HW_RANDOM_AMD
> >  
> >  	  If unsure, say Y.
> >  
> > +config HW_RANDOM_AIROHA
> > +	tristate "Airoha True HW Random Number Generator support"
> > +	depends on ARCH_AIROHA || COMPILE_TEST
> 
> > +	default HW_RANDOM
> This should not be always enabled when HW_RANDOM is enabled. Enabling
> driver should be a opt-in.

Was following the pattern with other HW_RANDOM config. Ok will drop.

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