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

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Message-ID: <ab52b007-b6d7-4e97-9436-eb78365e6e99@gmail.com>
Date:   Tue, 19 Nov 2019 12:14:58 +0100
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Stephen Brennan <stephen@...nnan.io>
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



On 19/11/2019 07:14, 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.
> 

I'd prefer to split this in two patches. One moving the node and another one
adding the new node for bcm2711.

Regards,
Matthias

> Signed-off-by: Stephen Brennan <stephen@...nnan.io>
> ---
>  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@...00000 {
>  		};
>  
>  		rng@...04000 {
> +			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@...01400 {
> 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@...04000 {
> +			compatible = "brcm,bcm2835-rng";
> +			reg = <0x7e104000 0x10>;
> +			interrupts = <2 29>;
> +		};
> +	};
> +};
> diff --git a/arch/arm/boot/dts/bcm283x.dtsi b/arch/arm/boot/dts/bcm283x.dtsi
> index 3caaa57eb6c8..5219339fc27c 100644
> --- a/arch/arm/boot/dts/bcm283x.dtsi
> +++ b/arch/arm/boot/dts/bcm283x.dtsi
> @@ -84,12 +84,6 @@ clocks: cprman@...01000 {
>  				<&dsi1 0>, <&dsi1 1>, <&dsi1 2>;
>  		};
>  
> -		rng@...04000 {
> -			compatible = "brcm,bcm2835-rng";
> -			reg = <0x7e104000 0x10>;
> -			interrupts = <2 29>;
> -		};
> -
>  		mailbox: mailbox@...0b880 {
>  			compatible = "brcm,bcm2835-mbox";
>  			reg = <0x7e00b880 0x40>;
>