linux-kernel - Re: [PATCH v1] PCI: dwc: convert to devm_platform_ioremap_resource

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Date:   Thu, 12 Nov 2020 15:22:33 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Dejin Zheng <zhengdejin5@...il.com>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Shawn Guo <shawn.guo@...aro.org>,
        Andy Gross <agross@...nel.org>,
        linux-pci <linux-pci@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] PCI: dwc: convert to devm_platform_ioremap_resource_byname()

Hi Dejin,

On Thu, May 28, 2020 at 6:18 PM Dejin Zheng <zhengdejin5@...il.com> wrote:
> Use devm_platform_ioremap_resource_byname() to simplify codes.
> it contains platform_get_resource_byname() and devm_ioremap_resource().
>
> Signed-off-by: Dejin Zheng <zhengdejin5@...il.com>

Thanks for your patch, which is now commit 936fa5cd7b8e3e2a ("PCI: dwc:
Convert to devm_platform_ioremap_resource_byname()") in v5.9.

> --- a/drivers/pci/controller/dwc/pci-dra7xx.c
> +++ b/drivers/pci/controller/dwc/pci-dra7xx.c
> @@ -593,13 +593,12 @@ static int __init dra7xx_add_pcie_ep(struct dra7xx_pcie *dra7xx,
>         ep = &pci->ep;
>         ep->ops = &pcie_ep_ops;
>
> -       res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ep_dbics");
> -       pci->dbi_base = devm_ioremap_resource(dev, res);
> +       pci->dbi_base = devm_platform_ioremap_resource_byname(pdev, "ep_dbics");
>         if (IS_ERR(pci->dbi_base))
>                 return PTR_ERR(pci->dbi_base);
>
> -       res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ep_dbics2");
> -       pci->dbi_base2 = devm_ioremap_resource(dev, res);
> +       pci->dbi_base2 =
> +               devm_platform_ioremap_resource_byname(pdev, "ep_dbics2");
>         if (IS_ERR(pci->dbi_base2))
>                 return PTR_ERR(pci->dbi_base2);

The part above looks fine.

> @@ -626,7 +625,6 @@ static int __init dra7xx_add_pcie_port(struct dra7xx_pcie *dra7xx,
>         struct dw_pcie *pci = dra7xx->pci;
>         struct pcie_port *pp = &pci->pp;
>         struct device *dev = pci->dev;
> -       struct resource *res;
>
>         pp->irq = platform_get_irq(pdev, 1);
>         if (pp->irq < 0) {
> @@ -638,8 +636,7 @@ static int __init dra7xx_add_pcie_port(struct dra7xx_pcie *dra7xx,
>         if (ret < 0)
>                 return ret;
>
> -       res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rc_dbics");
> -       pci->dbi_base = devm_ioremap_resource(dev, res);
> +       pci->dbi_base = devm_platform_ioremap_resource_byname(pdev, "rc_dbics");

Are you sure this is equivalent?
Before, devm_ioremap_resource() was called on "dev" (= pci->dev),
after it is called on "&pdev->dev" .

> --- a/drivers/pci/controller/dwc/pcie-intel-gw.c
> +++ b/drivers/pci/controller/dwc/pcie-intel-gw.c
> @@ -253,11 +253,9 @@ static int intel_pcie_get_resources(struct platform_device *pdev)
>         struct intel_pcie_port *lpp = platform_get_drvdata(pdev);
>         struct dw_pcie *pci = &lpp->pci;
>         struct device *dev = pci->dev;
> -       struct resource *res;
>         int ret;
>
> -       res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
> -       pci->dbi_base = devm_ioremap_resource(dev, res);
> +       pci->dbi_base = devm_platform_ioremap_resource_byname(pdev, "dbi");

Same  issue here...

>         if (IS_ERR(pci->dbi_base))
>                 return PTR_ERR(pci->dbi_base);
>
> @@ -291,8 +289,7 @@ static int intel_pcie_get_resources(struct platform_device *pdev)
>         ret = of_pci_get_max_link_speed(dev->of_node);
>         lpp->link_gen = ret < 0 ? 0 : ret;
>
> -       res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "app");
> -       lpp->app_base = devm_ioremap_resource(dev, res);
> +       lpp->app_base = devm_platform_ioremap_resource_byname(pdev, "app");
>         if (IS_ERR(lpp->app_base))
>                 return PTR_ERR(lpp->app_base);

... and here.

Gr{oetje,eeting}s,

                        Geert


--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds