linux-kernel - RE: [PATCH 1/3] hwrng: cctrng

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Message-ID: <DB6PR0802MB253304D0FE37A3C99C1A1E4CE9AF0@DB6PR0802MB2533.eurprd08.prod.outlook.com>
Date:   Mon, 27 Apr 2020 07:23:04 +0000
From:   Hadar Gat <Hadar.Gat@....com>
To:     Ard Biesheuvel <ardb@...nel.org>
CC:     Matt Mackall <mpm@...enic.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Stefan Wahren <wahrenst@....net>,
        Zaibo Xu <xuzaibo@...wei.com>,
        Tomer Maimon <tmaimon77@...il.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Gilad Ben-Yossef <gilad@...yossef.com>,
        Ofir Drang <Ofir.Drang@....com>, nd <nd@....com>
Subject: RE: [PATCH 1/3] hwrng: cctrng - Add dependency on OF


> -----Original Message-----
> From: Ard Biesheuvel <ardb@...nel.org>
> 
> On Mon, 27 Apr 2020 at 07:42, Hadar Gat <hadar.gat@....com> wrote:
> >
> > The cctrng is unusable on non-DT systems so we should depend on it.
> >
> > Signed-off-by: Hadar Gat <hadar.gat@....com>
> > ---
> >  drivers/char/hw_random/Kconfig | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/char/hw_random/Kconfig
> > b/drivers/char/hw_random/Kconfig index 0c99735..df2d001 100644
> > --- a/drivers/char/hw_random/Kconfig
> > +++ b/drivers/char/hw_random/Kconfig
> > @@ -476,7 +476,7 @@ config HW_RANDOM_KEYSTONE
> >
> >  config HW_RANDOM_CCTRNG
> >         tristate "Arm CryptoCell True Random Number Generator support"
> > -       depends on HAS_IOMEM
> > +       depends on HAS_IOMEM & OF
> 
> Does your driver in fact depend on CONFIG_HAS_IOMEM ?

Yes, it uses devm_ioremap_resource() for registers mapping.

> 
> >         default HW_RANDOM
> >         help
> >           This driver provides support for the True Random Number
> > --
> > 2.7.4
> >