linux-kernel - Re: [PATCH v2 3/3] ARM: dts: bcm2711: Enable HWRNG support

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Date:   Tue, 19 Nov 2019 09:09:53 -0800
From:   "Stephen Brennan" <stephen@...nnan.io>
To:     "Nicolas Saenz Julienne" <nsaenzjulienne@...e.de>
Cc:     "Mark Rutland" <mark.rutland@....com>,
        <devicetree@...r.kernel.org>,
        <linux-rpi-kernel@...ts.infradead.org>,
        "Florian Fainelli" <f.fainelli@...il.com>,
        "Herbert Xu" <herbert@...dor.apana.org.au>,
        "Scott Branden" <sbranden@...adcom.com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        "Ray Jui" <rjui@...adcom.com>, <linux-kernel@...r.kernel.org>,
        "Eric Anholt" <eric@...olt.net>,
        "Rob Herring" <robh+dt@...nel.org>,
        <bcm-kernel-feedback-list@...adcom.com>,
        "Stefan Wahren" <wahrenst@....net>,
        "Matt Mackall" <mpm@...enic.com>, "Arnd Bergmann" <arnd@...db.de>,
        <linux-crypto@...r.kernel.org>
Subject: Re: [PATCH v2 3/3] ARM: dts: bcm2711: Enable HWRNG support

Hi Nicolas,

On Tue Nov 19, 2019 at 11:07 AM, Nicolas Saenz Julienne wrote:
> Hi Stephen, thanks for the follow-up.
>
> 
> On Mon, 2019-11-18 at 22:14 -0800, Stephen Brennan wrote:
> > BCM2711 features a RNG200 hardware random number generator block, which i=
> s
> > different from the BCM283x from which it inherits. Move the rng block fro=
> m
> > BCM283x into a separate common file, and update the rng declaration of
> > BCM2711.
> >=20
> > Signed-off-by: Stephen Brennan <stephen@...nnan.io>
> > ---
>
> 
> It's petty in this case but you should add a list of changes here too.

To make sure I understand, you mean listing out the changes in each 
revision of the patch series?

>
> 
> >  arch/arm/boot/dts/bcm2711.dtsi        |  6 +++---
> >  arch/arm/boot/dts/bcm2835.dtsi        |  1 +
> >  arch/arm/boot/dts/bcm2836.dtsi        |  1 +
> >  arch/arm/boot/dts/bcm2837.dtsi        |  1 +
> >  arch/arm/boot/dts/bcm283x-common.dtsi | 11 +++++++++++
> >  arch/arm/boot/dts/bcm283x.dtsi        |  6 ------
> >  6 files changed, 17 insertions(+), 9 deletions(-)
> >  create mode 100644 arch/arm/boot/dts/bcm283x-common.dtsi
> >=20
> > diff --git a/arch/arm/boot/dts/bcm2711.dtsi b/arch/arm/boot/dts/bcm2711.d=
> tsi
> > index ac83dac2e6ba..4975567e948e 100644
> > --- a/arch/arm/boot/dts/bcm2711.dtsi
> > +++ b/arch/arm/boot/dts/bcm2711.dtsi
> > @@ -92,10 +92,10 @@ pm: watchdog@...00000 {
> >  		};
> > =20
> >  		rng@...04000 {
> > +			compatible =3D "brcm,bcm2711-rng200";
> > +			reg =3D <0x7e104000 0x28>;
> >  			interrupts =3D <GIC_SPI 125 IRQ_TYPE_LEVEL_HIGH>;
> > -
> > -			/* RNG is incompatible with brcm,bcm2835-rng */
> > -			status =3D "disabled";
> > +			status =3D "okay";
> >  		};
> > =20
> >  		uart2: serial@...01400 {
> > diff --git a/arch/arm/boot/dts/bcm2835.dtsi b/arch/arm/boot/dts/bcm2835.d=
> tsi
> > index 53bf4579cc22..f7b2f46e307d 100644
> > --- a/arch/arm/boot/dts/bcm2835.dtsi
> > +++ b/arch/arm/boot/dts/bcm2835.dtsi
> > @@ -1,5 +1,6 @@
> >  // SPDX-License-Identifier: GPL-2.0
> >  #include "bcm283x.dtsi"
> > +#include "bcm283x-common.dtsi"
> >  #include "bcm2835-common.dtsi"
> > =20
> >  / {
> > diff --git a/arch/arm/boot/dts/bcm2836.dtsi b/arch/arm/boot/dts/bcm2836.d=
> tsi
> > index 82d6c4662ae4..a85374195796 100644
> > --- a/arch/arm/boot/dts/bcm2836.dtsi
> > +++ b/arch/arm/boot/dts/bcm2836.dtsi
> > @@ -1,5 +1,6 @@
> >  // SPDX-License-Identifier: GPL-2.0
> >  #include "bcm283x.dtsi"
> > +#include "bcm283x-common.dtsi"
> >  #include "bcm2835-common.dtsi"
> > =20
> >  / {
> > diff --git a/arch/arm/boot/dts/bcm2837.dtsi b/arch/arm/boot/dts/bcm2837.d=
> tsi
> > index 9e95fee78e19..045d78ffea08 100644
> > --- a/arch/arm/boot/dts/bcm2837.dtsi
> > +++ b/arch/arm/boot/dts/bcm2837.dtsi
> > @@ -1,4 +1,5 @@
> >  #include "bcm283x.dtsi"
> > +#include "bcm283x-common.dtsi"
> >  #include "bcm2835-common.dtsi"
> > =20
> >  / {
> > diff --git a/arch/arm/boot/dts/bcm283x-common.dtsi
> > b/arch/arm/boot/dts/bcm283x-common.dtsi
> > new file mode 100644
> > index 000000000000..3c8834bee390
> > --- /dev/null
> > +++ b/arch/arm/boot/dts/bcm283x-common.dtsi
> > @@ -0,0 +1,11 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +
> > +/ {
> > +	soc {
> > +		rng@...04000 {
> > +			compatible =3D "brcm,bcm2835-rng";
> > +			reg =3D <0x7e104000 0x10>;
> > +			interrupts =3D <2 29>;
> > +		};
> > +	};
> > +};
>
> 
> I think Stefan wrote bcm283x-common.dtsi by mistake, he really meant
> bcm2835-common.dtsi.
>
> 
> See bcm2835-common.dtsi's header comment:
>
> 
> /* This include file covers the common peripherals and configuration
> betwee=
> n
> * bcm2835, bcm2836 and bcm2837 implementations.
> */
>

Wow, thank you, that makes a lot more sense!

Best,
Stephen

> 
> Regards,
> Nicolas
>
> 
>
> 
>
>