linux-kernel - Re: [PATCH v5 5/5] power: sequencing: Add the Power Sequencing driver for the PCIe M.2 connectors

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Message-ID: <xd5uvfqcx3vcbcqerji556ejstmgvtci4chfzxclkzhizqmqxa@xusf2skt6xhh>
Date: Fri, 9 Jan 2026 11:32:12 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: Bartosz Golaszewski <brgl@...nel.org>
Cc: manivannan.sadhasivam@....qualcomm.com, 
	Bjorn Helgaas <bhelgaas@...gle.com>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Damien Le Moal <dlemoal@...nel.org>, Niklas Cassel <cassel@...nel.org>, 
	Linus Walleij <linus.walleij@...aro.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, linux-ide@...r.kernel.org
Subject: Re: [PATCH v5 5/5] power: sequencing: Add the Power Sequencing
 driver for the PCIe M.2 connectors

On Thu, Jan 08, 2026 at 01:15:12PM +0100, Bartosz Golaszewski wrote:
> On Wed, Jan 7, 2026 at 3:11 PM Manivannan Sadhasivam via B4 Relay
> <devnull+manivannan.sadhasivam.oss.qualcomm.com@...nel.org> wrote:
> >
> > From: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
> >
> > This driver is used to control the PCIe M.2 connectors of different
> > Mechanical Keys attached to the host machines and supporting different
> > interfaces like PCIe/SATA, USB/UART etc...
> >
> > Currently, this driver supports only the Mechanical Key M connectors with
> > PCIe interface. The driver also only supports driving the mandatory 3.3v
> > and optional 1.8v power supplies. The optional signals of the Key M
> > connectors are not currently supported.
> >
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
> 
> This looks good to me, though there are some nits I may fix when applying.
> 
> I'll pick it up for v7.0 once the bindings are reviewed.
> 

Ok. I'm expecting patch 1 to go through ATA tree, patch 2 through DT, and
patches 3,4 through PCI tree.

> > +++ b/drivers/power/sequencing/pwrseq-pcie-m2.c
> > @@ -0,0 +1,169 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +/*
> > + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
> > + * Author: Manivannan Sadhasivam <manivannan.sadhasivam@....qualcomm.com>
> > + */
> > +
> > +#include <linux/device.h>
> > +#include <linux/mod_devicetable.h>
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +#include <linux/of_graph.h>
> > +#include <linux/of_platform.h>
> 
> It looks like this is a leftover from previous versions and you no
> longer need it?
> 

Yeah.

> > +
> > +static void pwrseq_pcie_free_resources(void *data)
> > +{
> > +       struct pwrseq_pcie_m2_ctx *ctx = data;
> > +
> > +       regulator_bulk_free(ctx->num_vregs, ctx->regs);
> > +}
> 
> I would call it pwrseq_pcie_m2_free_regulators() if you don't mind.
> 

Sure. I indeed missed '_m2'.

- Mani

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