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

Nicolas Saenz Julienne
2019-11-19T10:07:16Z

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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 is
> different from the BCM283x from which it inherits. Move the rng block from
> BCM283x into a separate common file, and update the rng declaration of
> BCM2711.
>
> Signed-off-by: Stephen Brennan <stephen@brennan.io>
> ---

It's petty in this case but you should add a list of changes here too.

> 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
>
> diff --git a/arch/arm/boot/dts/bcm2711.dtsi b/arch/arm/boot/dts/bcm2711.dtsi
> index ac83dac2e6ba..4975567e948e 100644
> --- a/arch/arm/boot/dts/bcm2711.dtsi
> +++ b/arch/arm/boot/dts/bcm2711.dtsi
> @@ -92,10 +92,10 @@ pm: watchdog@7e100000 {
> };
>
> rng@7e104000 {
> + compatible = "brcm,bcm2711-rng200";
> + reg = <0x7e104000 0x28>;
> interrupts = <GIC_SPI 125 IRQ_TYPE_LEVEL_HIGH>;
> -
> - /* RNG is incompatible with brcm,bcm2835-rng */
> - status = "disabled";
> + status = "okay";
> };
>
> uart2: serial@7e201400 {
> diff --git a/arch/arm/boot/dts/bcm2835.dtsi b/arch/arm/boot/dts/bcm2835.dtsi
> 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"
>
> / {
> diff --git a/arch/arm/boot/dts/bcm2836.dtsi b/arch/arm/boot/dts/bcm2836.dtsi
> 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"
>
> / {
> diff --git a/arch/arm/boot/dts/bcm2837.dtsi b/arch/arm/boot/dts/bcm2837.dtsi
> 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"
>
> / {
> 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@7e104000 {
> + compatible = "brcm,bcm2835-rng";
> + reg = <0x7e104000 0x10>;
> + interrupts = <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 between
* bcm2835, bcm2836 and bcm2837 implementations.
*/

Regards,
Nicolas

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