Re: [PATCH v2 2/9] irqchip: irq-qcom-mpm: Register MPM with cpu_pm for RPM notification

[Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>]

On 10/15/26 11:55 AM, Sneh Mankad wrote:
> MPM irqchip needs to notify RPM (Resource Power Manager) processor to read
> the latest wake up capable interrupts when the CPU cluster is entering the
> deepest idle state. This is done by sending IPC interrupt to RPM and is
> implemented as .power_off() callback by registering MPM as parent power
> domain to CPU cluster.
> 
> Such implementation earlier introduced a hard probe dependency between MPM
> irqchip and CPU cluster power domains. That is MPM irqchip needs to finish
> probe before PSCI power domains are probed.
> 
> The above problem has since been resolved after bd7f488a8e5d ("cpuidle:
> psci: Fix support for probe deferral by dropping the faux device") / [1].
> However, it makes sense to remodel the RPM notification in MPM irqchip due
> to general consistency.
> 
> MPM is not really a power domain provider, all it needs is a notification
> when CPU cluster is going to power collapse to carry out the RPM
> notification. We can register for CPU_PM notifications for that purpose.
> This way we can avoid such unrelated dependencies.
> 
> We cannot register MPM under CPU cluster power domain and rely on
> GENPD notifications here, since that way cluster low power modes will be
> blocked whenever some consumer of MPM, and in turn MPM itself, are
> runtime active. This will add another unnecessary dependency for CPU
> cluster low power modes.
> 
> For now as first step, register with cpu_pm as a fallback to manage RPM
> notification. Trigger the RPM notification when the last CPU in CPU cluster
> goes to power collapse.

IIUC since we no longer need a dt-bindings addition, after this series
lands, we'll be able to strip out the powerdomain provider path, right?

Konrad