On Thu, Jan 28, 2016 at 04:33:48PM +0000, Jon Hunter wrote:
> Add power-domain binding documentation for the NVIDIA PMC driver in
> order to support generic power-domains.
>
> Signed-off-by: Jon Hunter <jonathanh@xxxxxxxxxx>
> ---
> .../bindings/arm/tegra/nvidia,tegra20-pmc.txt | 55 ++++++++++++++++++++++
> 1 file changed, 55 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt
> index 53aa5496c5cf..3c77373aa826 100644
> --- a/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt
> +++ b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt
> @@ -1,5 +1,7 @@
> NVIDIA Tegra Power Management Controller (PMC)
>
> +== Power Management Controller Node ==
> +
> The PMC block interacts with an external Power Management Unit. The PMC
> mostly controls the entry and exit of the system from different sleep
> modes. It provides power-gating controllers for SoC and CPU power-islands.
> @@ -70,6 +72,10 @@ Optional properties for hardware-triggered thermal reset (inside 'i2c-thermtrip'
> Defaults to 0. Valid values are described in section 12.5.2
> "Pinmux Support" of the Tegra4 Technical Reference Manual.
>
> +Optional nodes:
> +- powergates : This node contains a hierarchy of power domain nodes, which
> + should match the powergates on the Tegra SoC.
> +
> Example:
>
> / SoC dts including file
> @@ -115,3 +121,52 @@ pmc@7000f400 {
> };
> ...
> };
> +
> +
> +== PM Domain Nodes ==
> +
> +Each of the PM domain nodes represents a power-domain on the Tegra SoC
> +that can be power-gated by the PMC and should be named appropriately.
> +
> +Required properties:
> + - clocks: Must contain an entry for each clock required by the PMC for
> + controlling a power-gate. See ../clocks/clock-bindings.txt for details.
> + - resets: Must contain an entry for each reset required by the PMC for
> + controlling a power-gate. See ../reset/reset.txt for details.
> + - nvidia,powergate: Integer cell that contains an identifier for the PMC
> + power-gate that is associated with the power-domain. Please refer to
> + the Tegra TRM for more details.
Why not make this value be the power-domain cell for consumers and the
pmc be the phandle. Then use reg property for the subnodes. That avoids
a custom property.
> + - #power-domain-cells: Must be 0.
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