On Tue, Feb 27, 2018 at 03:55:49PM -0800, Jolly Shah wrote:
> Add documentation to describe ZynqMP power domain bindings.
>
> Signed-off-by: Jolly Shah <jollys@xxxxxxxxxx>
> Signed-off-by: Rajan Vaja <rajanv@xxxxxxxxxx>
> ---
> .../devicetree/bindings/power/zynqmp-genpd.txt | 46 ++++++++++++++++++++++
> 1 file changed, 46 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/power/zynqmp-genpd.txt
>
> diff --git a/Documentation/devicetree/bindings/power/zynqmp-genpd.txt b/Documentation/devicetree/bindings/power/zynqmp-genpd.txt
> new file mode 100644
> index 0000000..25f9711
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/power/zynqmp-genpd.txt
> @@ -0,0 +1,46 @@
> +Device Tree bindings for Xilinx Zynq MPSoC PM domains
> +
> +The binding for zynqmp-genpd follow the common generic PM domain binding[1].
> +
> +[1] Documentation/devicetree/bindings/power/power_domain.txt
> +
> +== Zynq MPSoC Generic PM Domain Node ==
> +
> +Required properties:
> + - compatible: Must be: "xlnx,zynqmp-genpd"
genpd is a Linux term. The DT should contain a power controller that
controls physical power islands on a chip.
> +
> +This node contains a number of subnodes, each representing a single PM domain
> +that PM domain consumer devices reference.
> +
> +== PM Domain Nodes ==
> +
> +Required properties:
> + - #power-domain-cells: Number of cells in a PM domain specifier. Must be 0.
> + - pd-id: List of domain identifiers of as defined by platform firmware. These
> + identifiers are passed to the PM firmware.
> +
> +Example:
> + zynqmp-genpd {
> + compatible = "xlnx,zynqmp-genpd";
What's the control interface for controlling the domains?
> +
> + pd_usb0: pd-usb0 {
> + pd-id = <22>;
> + #power-domain-cells = <0>;
There's no need for all these sub nodes. Make #power-domain-cells 1 and
put the id in the cell value.
> + };
> +
> + pd_sata: pd-sata {
> + pd-id = <28>;
> + #power-domain-cells = <0>;
> + };
> +
> + pd_gpu: pd-gpu {
> + pd-id = <58 20 21>;
> + #power-domain-cells = <0x0>;
> + };
> + };
> +
> + sata0: ahci@SATA_AHCI_HBA {
> + ...
> + power-domains = <&pd_sata>;
> + ...
> + };
> --
> 2.7.4
>
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