Re: [PATCH v4 1/7] dt-bindings: Amlogic: Add Meson8 and Meson8b SMP related documentation

[Neil Armstrong <narmstrong-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>]

Le 22/07/2017 21:19, Martin Blumenstingl a écrit :
> From: Carlo Caione <carlo-6IF/jdPJHihWk0Htik3J/w@public.gmane.org>
> 
> With this patch we add documentation for:
> 
> * power-management-unit: the PMU is used to bring up the cores during
>   SMP operations
> * sram: among other things the sram is used to store the first code
>   executed by the core when it is powered up
> * cpu-enable-method: the CPU enable method used by Amlogic Meson8 and
>   Meson8b SoCs
> 
> Signed-off-by: Carlo Caione <carlo-6IF/jdPJHihWk0Htik3J/w@public.gmane.org>
> [also add Meson8 to the documentation]
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
> Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> ---
>  .../devicetree/bindings/arm/amlogic/pmu.txt        | 18 ++++++++++++
>  .../devicetree/bindings/arm/amlogic/smp-sram.txt   | 32 ++++++++++++++++++++++
>  Documentation/devicetree/bindings/arm/cpus.txt     |  2 ++
>  3 files changed, 52 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/arm/amlogic/pmu.txt
>  create mode 100644 Documentation/devicetree/bindings/arm/amlogic/smp-sram.txt
> 
> diff --git a/Documentation/devicetree/bindings/arm/amlogic/pmu.txt b/Documentation/devicetree/bindings/arm/amlogic/pmu.txt
> new file mode 100644
> index 000000000000..72f8d08198b6
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/amlogic/pmu.txt
> @@ -0,0 +1,18 @@
> +Amlogic Meson8 and Meson8b power-management-unit:
> +-------------------------------------------------
> +
> +The pmu is used to turn off and on different power domains of the SoCs
> +This includes the power to the CPU cores.
> +
> +Required node properties:
> +- compatible value : depending on the SoC this should be one of:
> +			"amlogic,meson8-pmu"
> +			"amlogic,meson8b-pmu"
> +- reg : physical base address and the size of the registers window
> +
> +Example:
> +
> +	pmu@c81000e4 {
> +		compatible = "amlogic,meson8b-pmu", "syscon";
> +		reg = <0xc81000e0 0x18>;
> +	};
> diff --git a/Documentation/devicetree/bindings/arm/amlogic/smp-sram.txt b/Documentation/devicetree/bindings/arm/amlogic/smp-sram.txt
> new file mode 100644
> index 000000000000..3473ddaadfac
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/amlogic/smp-sram.txt
> @@ -0,0 +1,32 @@
> +Amlogic Meson8 and Meson8b SRAM for smp bringup:
> +------------------------------------------------
> +
> +Amlogic's SMP-capable SoCs use part of the sram for the bringup of the cores.
> +Once the core gets powered up it executes the code that is residing at a
> +specific location.
> +
> +Therefore a reserved section sub-node has to be added to the mmio-sram
> +declaration.
> +
> +Required sub-node properties:
> +- compatible : depending on the SoC this should be one of:
> +		"amlogic,meson8-smp-sram"
> +		"amlogic,meson8b-smp-sram"
> +
> +The rest of the properties should follow the generic mmio-sram discription
> +found in ../../misc/sram.txt
> +
> +Example:
> +
> +	sram: sram@d9000000 {
> +		compatible = "mmio-sram";
> +		reg = <0xd9000000 0x20000>;
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		ranges = <0 0xd9000000 0x20000>;
> +
> +		smp-sram@1ff80 {
> +			compatible = "amlogic,meson8b-smp-sram";
> +			reg = <0x1ff80 0x8>;
> +		};
> +	};
> diff --git a/Documentation/devicetree/bindings/arm/cpus.txt b/Documentation/devicetree/bindings/arm/cpus.txt
> index a44253cad269..1ef3e53b9be7 100644
> --- a/Documentation/devicetree/bindings/arm/cpus.txt
> +++ b/Documentation/devicetree/bindings/arm/cpus.txt
> @@ -197,6 +197,8 @@ described below.
>  			    "actions,s500-smp"
>  			    "allwinner,sun6i-a31"
>  			    "allwinner,sun8i-a23"
> +			    "amlogic,meson8-smp"
> +			    "amlogic,meson8b-smp"
>  			    "arm,realview-smp"
>  			    "brcm,bcm11351-cpu-method"
>  			    "brcm,bcm23550"
> 

Reviewed-by: Neil Armstrong <narmstrong-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>
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