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

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Message-ID: <5235617.GXAFRqVoOG@workhorse>
Date: Mon, 27 Oct 2025 16:12:19 +0100
From: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
To: 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>, Anand Moon <linux.amoon@...il.com>
Cc: Anand Moon <linux.amoon@...il.com>
Subject:
 Re: [PATCH v1 1/2] PCI: dw-rockchip: Add remove callback for resource cleanup

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.

Kind regards,
Nicolas Frattaroli

> +}
> +
>  static const struct rockchip_pcie_of_data rockchip_pcie_rc_of_data_rk3568 = {
>  	.mode = DW_PCIE_RC_TYPE,
>  };
> @@ -754,5 +764,6 @@ static struct platform_driver rockchip_pcie_driver = {
>  		.suppress_bind_attrs = true,
>  	},
>  	.probe = rockchip_pcie_probe,
> +	.remove = rockchip_pcie_remove,
>  };
>  builtin_platform_driver(rockchip_pcie_driver);
>