RE: [PATCH 2/3] hwrng: cctrng - change default to n

[Hadar Gat <Hadar.Gat@arm.com>]

> -----Original Message-----
> From: Ard Biesheuvel <ardb@kernel.org>
> 
> On Mon, 27 Apr 2020 at 07:42, Hadar Gat <hadar.gat@arm.com> wrote:
> >
> > For many users, the Arm CryptoCell HW is not available, so the default
> > for HW_RANDOM_CCTRNG changed to n.
> >
> > Signed-off-by: Hadar Gat <hadar.gat@arm.com>
> > ---
> >  drivers/char/hw_random/Kconfig | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/char/hw_random/Kconfig
> > b/drivers/char/hw_random/Kconfig index df2d001..0938d3d 100644
> > --- a/drivers/char/hw_random/Kconfig
> > +++ b/drivers/char/hw_random/Kconfig
> > @@ -476,8 +476,8 @@ config HW_RANDOM_KEYSTONE
> >
> >  config HW_RANDOM_CCTRNG
> >         tristate "Arm CryptoCell True Random Number Generator support"
> > -       depends on HAS_IOMEM & OF
> > -       default HW_RANDOM
> > +       depends on HW_RANDOM & HAS_IOMEM & OF
> 
> The whole block is guarded by if HW_RANDOM, so I don't think you need the
> dependency here.
> 
> > +       default n
> 
> 'default n' is the default so you can just remove the line

Is this a guideline or just optional?
Personally I like things to be explicit and if allowed I prefer to keep this line.

> 
> >         help
> >           This driver provides support for the True Random Number
> >           Generator available in Arm TrustZone CryptoCell.
> > --
> > 2.7.4
> >