linux-kernel - Re: [PATCHv5 1/8] dt-bindings, firmware: add Intel Stratix10 service layer binding

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Date:   Thu, 24 May 2018 10:04:09 -0700
From:   Moritz Fischer <mdf@...nel.org>
To:     richard.gong@...ux.intel.com
Cc:     catalin.marinas@....com, will.deacon@....com, dinguyen@...nel.org,
        robh+dt@...nel.org, mark.rutland@....com, atull@...nel.org,
        mdf@...nel.org, arnd@...db.de, gregkh@...uxfoundation.org,
        corbet@....net, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-fpga@...r.kernel.org, linux-doc@...r.kernel.org,
        yves.vandervennet@...ux.intel.com, richard.gong@...el.com
Subject: Re: [PATCHv5 1/8] dt-bindings, firmware: add Intel Stratix10 service
 layer binding

On Thu, May 24, 2018 at 11:33:13AM -0500, richard.gong@...ux.intel.com wrote:
> From: Richard Gong <richard.gong@...el.com>
> 
> Add a device tree binding for the Intel Stratix10 service layer driver
> 
> Signed-off-by: Richard Gong <richard.gong@...el.com>
> Signed-off-by: Alan Tull <atull@...nel.org>
> Reviewed-by: Rob Herring <robh@...nel.org>
Acked-by: Moritz Fischer <mdf@...nel.org>
> ---
> v2: Change to put service layer driver node under the firmware node
>     Change compatible to "intel, stratix10-svc"
> v3: No change
> v4: Add Rob's Reviewed-by
> v5: No change
> ---
>  .../bindings/firmware/intel,stratix10-svc.txt      | 57 ++++++++++++++++++++++
>  1 file changed, 57 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/firmware/intel,stratix10-svc.txt
> 
> diff --git a/Documentation/devicetree/bindings/firmware/intel,stratix10-svc.txt b/Documentation/devicetree/bindings/firmware/intel,stratix10-svc.txt
> new file mode 100644
> index 0000000..1fa6606
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/firmware/intel,stratix10-svc.txt
> @@ -0,0 +1,57 @@
> +Intel Service Layer Driver for Stratix10 SoC
> +============================================
> +Intel Stratix10 SoC is composed of a 64 bit quad-core ARM Cortex A53 hard
> +processor system (HPS) and Secure Device Manager (SDM). When the FPGA is
> +configured from HPS, there needs to be a way for HPS to notify SDM the
> +location and size of the configuration data. Then SDM will get the
> +configuration data from that location and perform the FPGA configuration.
> +
> +To meet the whole system security needs and support virtual machine requesting
> +communication with SDM, only the secure world of software (EL3, Exception
> +Layer 3) can interface with SDM. All software entities running on other
> +exception layers must channel through the EL3 software whenever it needs
> +service from SDM.
> +
> +Intel Stratix10 service layer driver, running at privileged exception level
> +(EL1, Exception Layer 1), interfaces with the service providers and provides
> +the services for FPGA configuration, QSPI, Crypto and warm reset. Service layer
> +driver also manages secure monitor call (SMC) to communicate with secure monitor
> +code running in EL3.
> +
> +Required properties:
> +-------------------
> +The svc node has the following mandatory properties, must be located under
> +the firmware node.
> +
> +- compatible: "intel,stratix10-svc"
> +- method: smc or hvc
> +        smc - Secure Monitor Call
> +        hvc - Hypervisor Call
> +- memory-region:
> +	phandle to the reserved memory node. See
> +	Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt
> +	for details
> +
> +Example:
> +-------
> +
> +	reserved-memory {
> +                #address-cells = <2>;
> +                #size-cells = <2>;
> +                ranges;
> +
> +                service_reserved: svcbuffer@0 {
> +                        compatible = "shared-dma-pool";
> +                        reg = <0x0 0x0 0x0 0x1000000>;
> +                        alignment = <0x1000>;
> +                        no-map;
> +                };
> +        };
> +
> +	firmware {
> +		svc {
> +			compatible = "intel,stratix10-svc";
> +			method = "smc";
> +			memory-region = <&service_reserved>;
> +		};
> +	};
> -- 
> 2.7.4
> 
> --
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