On 25 September 2014 18:28, Geert Uytterhoeven <geert+renesas@xxxxxxxxx> wrote:
> PM QoS device start/stop and save/restore state latencies are more or
> less properties of the hardware.
> In legacy code, they're specified from platform code.
> On DT platforms, their values should come from DT.
I am not so sure about this.
First, I think there a too much software affecting these latencies to
call them hardware properties.
Second, I am not sure that the future version of genpd will have all
these four latencies, but maybe only two. Let's see. I would thus
suggest to put this patch on hold for a while.
Kind regards
Uffe
>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
> ---
> Should these properties be called "linux,*-latency"?
>
> v3:
> - No changes
> v2:
> - New
>
> Documentation/devicetree/bindings/power/power_domain.txt | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/power/power_domain.txt b/Documentation/devicetree/bindings/power/power_domain.txt
> index 7bc421d84367d636..024815bc257723b1 100644
> --- a/Documentation/devicetree/bindings/power/power_domain.txt
> +++ b/Documentation/devicetree/bindings/power/power_domain.txt
> @@ -42,12 +42,22 @@ Required properties:
> - power-domains : A phandle and PM domain specifier as defined by bindings of
> the power controller specified by phandle.
>
> +Optional properties:
> + - stop-latency: Stop latency of the device, in ns,
> + - start-latency: Start latency of the device, in ns,
> + - save-state-latency: Save-state latency of the device, in ns,
> + - restore-state-latency: Restore-state latency of the device, in ns.
> +
> Example:
>
> leaky-device@12350000 {
> compatible = "foo,i-leak-current";
> reg = <0x12350000 0x1000>;
> power-domains = <&power 0>;
> + stop-latency = <250000>;
> + start-latency = <250000>;
> + save-state-latency = <250000>;
> + restore-state-latency = <250000>;
> };
>
> The node above defines a typical PM domain consumer device, which is located
> --
> 1.9.1
>
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