linux-kernel - Re: [PATCH 1/2] dt-bindings: soc: Add ZynqMP PM bindings

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Date:   Mon, 5 Mar 2018 16:33:28 -0600
From:   Rob Herring <robh@...nel.org>
To:     Jolly Shah <jolly.shah@...inx.com>
Cc:     matthias.bgg@...il.com, andy.gross@...aro.org, shawnguo@...nel.org,
        geert+renesas@...der.be, bjorn.andersson@...aro.org,
        sean.wang@...iatek.com, m.szyprowski@...sung.com,
        michal.simek@...inx.com, mark.rutland@....com, rajanv@...inx.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Jolly Shah <jollys@...inx.com>
Subject: Re: [PATCH 1/2] dt-bindings: soc: Add ZynqMP PM bindings

On Tue, Feb 27, 2018 at 03:24:25PM -0800, Jolly Shah wrote:
> Add documentation to describe Xilinx ZynqMP power management
> bindings.
> 
> Signed-off-by: Jolly Shah <jollys@...inx.com>
> Signed-off-by: Rajan Vaja <rajanv@...inx.com>
> ---
>  .../bindings/soc/xilinx/xlnx,zynqmp-power.txt      | 28 ++++++++++++++++++++++
>  1 file changed, 28 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/soc/xilinx/xlnx,zynqmp-power.txt
> 
> diff --git a/Documentation/devicetree/bindings/soc/xilinx/xlnx,zynqmp-power.txt b/Documentation/devicetree/bindings/soc/xilinx/xlnx,zynqmp-power.txt
> new file mode 100644
> index 0000000..5b7d963
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/xilinx/xlnx,zynqmp-power.txt
> @@ -0,0 +1,28 @@
> +Xilinx Zynq MPSoC Power Management Device Tree Bindings
> +
> +The zynqmp-power node describes the power management configurations.

That really tells me nothing. What aspect of power management does this 
interface control?

> +
> +Required properties:
> + - compatible	: Must contain:  "xlnx,zynqmp-power"
> + - mbox-names	: Name given to channels seen in the 'mboxes' property.
> +		  "rx" - Mailbox corresponding to receive path
> +		  "tx" - Mailbox corresponding to transmit path
> + - 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.

No need to define a standard property here. Just need to say how many 
entries and refer to the common binding.

> +
> +Examples:
> +	zynqmp_power: zynqmp-power {
> +		compatible = "xlnx,zynqmp-power";
> +		mboxes = <&ipi_mailbox_pmu0 0>,
> +			 <&ipi_mailbox_pmu0 1>;
> +		mbox-names = "tx", "rx";
> +	};
> -- 
> 2.7.4
>