On May 29, 2014, at 11:19 AM, Srinivas Kandagatla
<[email protected]> wrote:
>> += SUBDEVICES
>> +
>> +The RPM exposes resources to its subnodes. The below bindings specify the
>> set
>> +of valid subnodes that can operate on these resources.
>
> Why should these devices be on sub nodes?
>
> Any reason not to implement it like this,
>
> rpm: rpm@108000 {
> compatible = "qcom,rpm-msm8960";
> reg = <0x108000 0x1000 0x2011008 0x4>;
>
> interrupts = <0 19 0>, <0 21 0>, <0 22 0>;
> interrupt-names = "ack", "err", "wakeup";
> };
>
> pm8921_s1: pm8921-s1 {
> compatible = "qcom,rpm-pm8921-smps";
>
> regulator-min-microvolt = <1225000>;
> regulator-max-microvolt = <1225000>;
> regulator-always-on;
>
> qcom,rpm = <&rpm QCOM_RPM_PM8921_S1>;
> qcom,switch-mode-frequency = <3200000>;
> qcom,hpm-threshold = <100000>;
> };
>
> This would simplify the driver code too and handle the interface neatly then
> depending on device hierarchy.
> rpm would be a interface library to the clients. Makes the drivers more
> independent, and re-usable if we do this way.
>
> ??
One reason to go with sub nodes is it creates a proper driver ordering
dependency as I assume rpm driver will end up calling of_platform_populate for
the sub nodes at the point that the RPM driver is ready. We could do this with
deferred probe but doing it explicitly is better in my opinion as it limits the
amount of time between when RPM is ready vs when the children can start doing
things
- k
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