Re: [PATCH 4/5] PCI/pwrctrl: Add APIs to power on/off the pwrctrl devices

[Bartosz Golaszewski]

On Mon, 24 Nov 2025 17:20:47 +0100, Manivannan Sadhasivam via B4 Relay
<devnull+manivannan.sadhasivam.oss.qualcomm.com@xxxxxxxxxx> said:
> From: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxxxxxxxx>
>
> To fix PCIe bridge resource allocation issues when powering PCIe
> switches with the pwrctrl driver, introduce APIs to explicitly power
> on and off all related devices simultaneously.
>
> Previously, the individual pwrctrl drivers powered on/off the PCIe devices
> autonomously, without any control from the controller drivers. But to
> enforce ordering w.r.t powering on the devices, these APIs will power
> on/off all the devices at the same time.
>
> The pci_pwrctrl_power_on_devices() API recursively scans the PCI child
> nodes, makes sure that pwrctrl drivers are bind to devices, and calls their
> power_on() callbacks.
>
> Similarly, pci_pwrctrl_power_off_devices() API powers off devices
> recursively via their power_off() callbacks.
>
> These APIs are expected to be called during the controller probe and
> suspend/resume time to power on/off the devices. But before calling these
> APIs, the pwrctrl devices should've been created beforehand using the
> pci_pwrctrl_{create/destroy}_devices() APIs.
>
> Co-developed-by: Krishna Chaitanya Chundru <krishna.chundru@xxxxxxxxxxxxxxxx>
> Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@xxxxxxxxxxxxxxxx>
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxxxxxxxx>
> ---

Makes sense.

Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>