linux-kernel - Re: [PATCHv2 1/3] dt: xilinx: zynqmp: Add bindings for PM firmware

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Message-ID: <20170816160046.GB12389@leverpostej>
Date:   Wed, 16 Aug 2017 17:00:46 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Michal Simek <michal.simek@...inx.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Arnd Bergmann <arnd@...db.de>, edgar.iglesias@...inx.com,
        Rob Herring <robh@...nel.org>,
        Soren Brinkmann <soren.brinkmann@...inx.com>,
        devicetree@...r.kernel.org, monstr@...str.eu,
        linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCHv2 1/3] dt: xilinx: zynqmp: Add bindings for PM firmware

On Wed, Aug 16, 2017 at 02:24:56PM +0200, Michal Simek wrote:
> From: Soren Brinkmann <soren.brinkmann@...inx.com>
> 
> Document the DT bindings for the Zynq UltraScale+ PM Firmware.
> 
> Signed-off-by: Soren Brinkmann <soren.brinkmann@...inx.com>
> Signed-off-by: Michal Simek <michal.simek@...inx.com>
> ---
> 
> Changes in v2:
> - Move to bindings/firmware and also add it to firmware node
>   Reported-by Rob
> 
>  .../bindings/firmware/xlnx,zynqmp-pm.txt           | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/firmware/xlnx,zynqmp-pm.txt
> 
> diff --git a/Documentation/devicetree/bindings/firmware/xlnx,zynqmp-pm.txt b/Documentation/devicetree/bindings/firmware/xlnx,zynqmp-pm.txt
> new file mode 100644
> index 000000000000..7de0c82758b3
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/firmware/xlnx,zynqmp-pm.txt
> @@ -0,0 +1,22 @@
> +Xilinx Zynq MPSoC Firmware Device Tree Bindings
> +
> +The zynqmp-pm node describes the interface to platform firmware.

Is there any documentation for this? I appreciate that the answer
might be "no".

> +Required properties:
> + - compatible:	Must contain:  "xlnx,zynqmp-pm"
> + - method:	The method of calling the PM-API firmware layer.
> +		Permitted values are:
> +		 - "smc" : To be used in configurations without a hypervisor
> +		 - "hvc" : To be used when hypervisor is present
> + - interrupts:	Interrupt specifier

For what, exactly?

Is this an interrupt for FW to signal the OS somehow?

If so, is it an SGI?

Thanks,
Mark.