linux-kernel - Re: [PATCH 1/2] dt-bindings: power: reset: xilinx: Add bindings for ipi mailbox

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Date:   Mon, 18 Nov 2019 11:35:20 -0600
From:   Rob Herring <robh@...nel.org>
To:     Rajan Vaja <rajan.vaja@...inx.com>
Cc:     sre@...nel.org, mark.rutland@....com, michal.simek@...inx.com,
        jollys@...inx.com, tejas.patel@...inx.com,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: power: reset: xilinx: Add bindings for
 ipi mailbox

On Tue, Nov 12, 2019 at 05:20:50AM -0800, Rajan Vaja wrote:
> Add IPI mailbox property and its example in xilinx zynqmp-power
> documentation.
> 
> Signed-off-by: Rajan Vaja <rajan.vaja@...inx.com>
> ---
>  .../bindings/power/reset/xlnx,zynqmp-power.txt     | 41 ++++++++++++++++++++--
>  1 file changed, 38 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/power/reset/xlnx,zynqmp-power.txt b/Documentation/devicetree/bindings/power/reset/xlnx,zynqmp-power.txt
> index d366f1e..450f3a4 100644
> --- a/Documentation/devicetree/bindings/power/reset/xlnx,zynqmp-power.txt
> +++ b/Documentation/devicetree/bindings/power/reset/xlnx,zynqmp-power.txt
> @@ -8,9 +8,27 @@ Required properties:
>   - compatible:		Must contain:	"xlnx,zynqmp-power"
>   - interrupts:		Interrupt specifier
>  
> --------
> -Example
> --------
> +Optional properties:
> + - mbox-names	: Name given to channels seen in the 'mboxes' property.
> +		  "rx" - Mailbox corresponding to receive path
> +		  "tx" - Mailbox corresponding to transmit path

The order here doesn't match the example. The order should be defined.

> + - mboxes	: Standard property to specify a Mailbox. Each value of
> +		  the mboxes property should contain a phandle to the
> +		  mailbox controller device node and an args specifier
> +		  that will be the phandle to the intended sub-mailbox
> +		  child node to be used for communication. See
> +		  Documentation/devicetree/bindings/mailbox/mailbox.txt
> +		  for more details about the generic mailbox controller
> +		  and client driver bindings. Also see
> +		  Documentation/devicetree/bindings/mailbox/ \
> +		  xlnx,zynqmp-ipi-mailbox.txt for typical controller that
> +		  is used to communicate with this System controllers.
> +
> +--------
> +Examples
> +--------
> +
> +Example with interrupt method:
>  
>  firmware {
>  	zynqmp_firmware: zynqmp-firmware {
> @@ -23,3 +41,20 @@ firmware {
>  		};
>  	};
>  };
> +
> +Example with IPI mailbox method:
> +
> +firmware {
> +
> +	zynqmp_firmware: zynqmp-firmware {
> +		compatible = "xlnx,zynqmp-firmware";
> +		method = "smc";
> +
> +		zynqmp_power: zynqmp-power {
> +			compatible = "xlnx,zynqmp-power";
> +			mboxes = <&ipi_mailbox_pmu0 0>,
> +				 <&ipi_mailbox_pmu0 1>;
> +			mbox-names = "tx", "rx";

interrupts is required.

> +		};
> +	};
> +};
> -- 
> 2.7.4
>