linux-kernel - Re: [PATCH v1 1/2] PCI: dw-rockchip: Add remove callback for resource cleanup

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Message-ID: <CANAwSgTmOvOZ35=3XjhrKu2iPCMOU8c8prK5XVAkf3cF1DHekQ@mail.gmail.com>
Date: Mon, 27 Oct 2025 22:01:23 +0530
From: Anand Moon <linux.amoon@...il.com>
To: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>, Krzysztof Wilczyński <kwilczynski@...nel.org>, 
	Manivannan Sadhasivam <mani@...nel.org>, Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>, 
	Heiko Stuebner <heiko@...ech.de>, Niklas Cassel <cassel@...nel.org>, 
	Shawn Lin <shawn.lin@...k-chips.com>, Hans Zhang <18255117159@....com>, 
	"open list:PCI NATIVE HOST BRIDGE AND ENDPOINT DRIVERS" <linux-pci@...r.kernel.org>, 
	"moderated list:ARM/Rockchip SoC support" <linux-arm-kernel@...ts.infradead.org>, 
	"open list:ARM/Rockchip SoC support" <linux-rockchip@...ts.infradead.org>, 
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 1/2] PCI: dw-rockchip: Add remove callback for resource cleanup

Hi Nicolas,

Thanks for your review comments.

On Mon, 27 Oct 2025 at 20:42, Nicolas Frattaroli
<nicolas.frattaroli@...labora.com> wrote:
>
> On Monday, 27 October 2025 15:55:29 Central European Standard Time Anand Moon wrote:
> > Introduce a .remove() callback to the Rockchip DesignWare PCIe
> > controller driver to ensure proper resource deinitialization during
> > device removal. This includes disabling clocks and deinitializing the
> > PCIe PHY.
> >
> > Signed-off-by: Anand Moon <linux.amoon@...il.com>
> > ---
> >  drivers/pci/controller/dwc/pcie-dw-rockchip.c | 11 +++++++++++
> >  1 file changed, 11 insertions(+)
> >
> > diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
> > index 87dd2dd188b4..b878ae8e2b3e 100644
> > --- a/drivers/pci/controller/dwc/pcie-dw-rockchip.c
> > +++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
> > @@ -717,6 +717,16 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
> >       return ret;
> >  }
> >
> > +static void rockchip_pcie_remove(struct platform_device *pdev)
> > +{
> > +     struct device *dev = &pdev->dev;
> > +     struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
> > +
> > +     /* Perform other cleanups as necessary */
> > +     clk_bulk_disable_unprepare(rockchip->clk_cnt, rockchip->clks);
> > +     rockchip_pcie_phy_deinit(rockchip);
>
> You may want to add a
>
>     if (rockchip->vpcie3v3)
>             regulator_disable(rockchip->vpcie3v3);
>
> here, since it's enabled in the probe function if it's found.
>
> Not doing so means the regulator core will produce a warning
> splat when devres removes it I'm fairly sure.
>
I've removed the dependency on vpcie3v3 in the following commit:
 c930b10f17c0 ("PCI: dw-rockchip: Simplify regulator setup with
devm_regulator_get_enable_optional()")
Please review this commit and confirm if everything looks good.

> Kind regards,
> Nicolas Frattaroli
>
Thanks
-Anand