[PATCH 10/13] ARM: dts: meson: add the hardware random number generator

[narmstrong@baylibre.com (Neil Armstrong)]

On 06/11/2017 12:16 PM, Martin Blumenstingl wrote:
> All supported Meson SoCs have a random number generator in CBUS.
> Newer SoCs (GXBB, GXL and GXM) provide only one 32-bit random number
> register, whereas the older SoCs (Meson6, Meson8 and Meson8b) have two
> 32-bit random number registers. The existing meson-rng driver only
> supports the lower 32-bit - but it still works fine on the older SoCs
> apart from this small limitation.
> 
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> ---
>  arch/arm/boot/dts/meson.dtsi   | 5 +++++
>  arch/arm/boot/dts/meson8.dtsi  | 5 +++++
>  arch/arm/boot/dts/meson8b.dtsi | 5 +++++
>  3 files changed, 15 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/meson.dtsi b/arch/arm/boot/dts/meson.dtsi
> index b05796bee088..a210084398dc 100644
> --- a/arch/arm/boot/dts/meson.dtsi
> +++ b/arch/arm/boot/dts/meson.dtsi
> @@ -78,6 +78,11 @@
>  			#size-cells = <1>;
>  			ranges = <0x0 0xc1100000 0x200000>;
>  
> +			hwrng: rng at 8100 {
> +				compatible = "amlogic,meson-rng";
> +				reg = <0x8100 0x8>;
> +			};
> +

Maybe you can add a "amlogic,mesonX-rng" before the "amlogic,meson-rng" here so you will
be able to support the different register layout and put the correct number in the meson8
and meson8b dtsi files.

>  			uart_A: serial at 84c0 {
>  				compatible = "amlogic,meson-uart";
>  				reg = <0x84c0 0x18>;
> diff --git a/arch/arm/boot/dts/meson8.dtsi b/arch/arm/boot/dts/meson8.dtsi
> index cf011dfe050e..a80181ddd416 100644
> --- a/arch/arm/boot/dts/meson8.dtsi
> +++ b/arch/arm/boot/dts/meson8.dtsi
> @@ -241,6 +241,11 @@
>  	clock-names = "stmmaceth";
>  };
>  
> +&hwrng {
> +	clocks = <&clkc CLKID_RNG0>;
> +	clock-names = "core";
> +};
> +
>  &i2c_AO {
>  	clocks = <&clkc CLKID_CLK81>;
>  };
> diff --git a/arch/arm/boot/dts/meson8b.dtsi b/arch/arm/boot/dts/meson8b.dtsi
> index 1c09090ff4a5..52aa3f68a6bd 100644
> --- a/arch/arm/boot/dts/meson8b.dtsi
> +++ b/arch/arm/boot/dts/meson8b.dtsi
> @@ -171,6 +171,11 @@
>  	};
>  };
>  
> +&hwrng {
> +	clocks = <&clkc CLKID_RNG0>;
> +	clock-names = "core";
> +};
> +
>  &L2 {
>  	arm,data-latency = <3 3 3>;
>  	arm,tag-latency = <2 2 2>;
> 

Apart from that :
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>