linux-kernel - Re: [PATCH v2 2/4] PCI/pwrctrl: Add support for handling PCIe M.2 connectors

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Message-ID: <CAMRc=Mcoi7koQBDyKPGet=FGX0emExRBhWMKW14fPmk217y2Ow@mail.gmail.com>
Date: Wed, 12 Nov 2025 15:59:53 +0100
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>, Manivannan Sadhasivam <mani@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, linux-kernel@...r.kernel.org, 
	linux-pci@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-arm-msm@...r.kernel.org, Stephan Gerhold <stephan.gerhold@...aro.org>, 
	Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>, linux-pm@...r.kernel.org
Subject: Re: [PATCH v2 2/4] PCI/pwrctrl: Add support for handling PCIe M.2 connectors

On Sat, Nov 8, 2025 at 4:23 AM Manivannan Sadhasivam
<manivannan.sadhasivam@....qualcomm.com> wrote:
>
> Add support for handling the PCIe M.2 connectors as Power Sequencing
> devices. These connectors are exposed as the Power Sequencing devices
> as they often support multiple interfaces like PCIe/SATA, USB/UART to the
> host machine and each interfaces could be driven by different client
> drivers at the same time.
>
> This driver handles the PCIe interface of these connectors. It first checks
> for the presence of the graph port in the Root Port node with the help of
> of_graph_is_present() API, if present, it acquires/poweres ON the
> corresponding pwrseq device.
>
> Once the pwrseq device is powered ON, the driver will skip parsing the Root
> Port/Slot resources and registers with the pwrctrl framework.
>
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
> ---

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