linux-kernel - Re: [PATCH] PCI: mediatek-gen3: Make use of the helper function devm_platform_ioremap_resource

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Date:   Wed, 1 Sep 2021 11:46:47 +0000
From:   Jianjun Wang (王建军) 
        <Jianjun.Wang@...iatek.com>
To:     "caihuoqing@...du.com" <caihuoqing@...du.com>
CC:     "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "robh@...nel.org" <robh@...nel.org>, "kw@...ux.com" <kw@...ux.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        Ryder Lee (李庚諺) <Ryder.Lee@...iatek.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [PATCH] PCI: mediatek-gen3: Make use of the helper function
 devm_platform_ioremap_resource_byname()

On Wed, 2021-09-01 at 15:40 +0800, Cai Huoqing wrote:
> Use the devm_platform_ioremap_resource_byname() helper instead of
> calling platform_get_resource_byname() and devm_ioremap_resource()
> separately
> 
> Signed-off-by: Cai Huoqing <caihuoqing@...du.com>
> ---
>  drivers/pci/controller/pcie-mediatek-gen3.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-mediatek-gen3.c
> b/drivers/pci/controller/pcie-mediatek-gen3.c
> index 17c59b0d6978..014747c6dcd4 100644
> --- a/drivers/pci/controller/pcie-mediatek-gen3.c
> +++ b/drivers/pci/controller/pcie-mediatek-gen3.c
> @@ -715,10 +715,7 @@ static int mtk_pcie_parse_port(struct
> mtk_pcie_port *port)
>  	struct resource *regs;
>  	int ret;
>  
> -	regs = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> "pcie-mac");
> -	if (!regs)
> -		return -EINVAL;
> -	port->base = devm_ioremap_resource(dev, regs);
> +	port->base = devm_platform_ioremap_resource_byname(pdev, "pcie-
> mac");
>  	if (IS_ERR(port->base)) {
>  		dev_err(dev, "failed to map register base\n");
>  		return PTR_ERR(port->base);

This "regs" will be used by port->reg_base as follows:

	port->reg_base = regs->start;

Please don't remove it directly.

Thanks.