linux-kernel - Re: [PATCH net] net: mdio: mscc-miim: Fix the mdio controller

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Date:   Tue, 28 Sep 2021 20:19:54 +0800
From:   Cai Huoqing <caihuoqing@...du.com>
To:     Horatiu Vultur <horatiu.vultur@...rochip.com>
CC:     <andrew@...n.ch>, <hkallweit1@...il.com>, <linux@...linux.org.uk>,
        <davem@...emloft.net>, <kuba@...nel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net] net: mdio: mscc-miim: Fix the mdio controller

On 28 9月 21 09:17:20, Horatiu Vultur wrote:
> According to the documentation the second resource is optional. But the
> blamed commit ignores that and if the resource is not there it just
> fails.
> 
> This patch reverts that to still allow the second resource to be
> optional because other SoC have the some MDIO controller and doesn't
> need to second resource.
> 
> Fixes: 672a1c394950 ("net: mdio: mscc-miim: Make use of the helper function devm_platform_ioremap_resource()")
> Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>

Reviewed-by: Cai Huoqing <caihuoqing@...du.com>

> ---
>  drivers/net/mdio/mdio-mscc-miim.c | 15 ++++++++++-----
>  1 file changed, 10 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/mdio/mdio-mscc-miim.c b/drivers/net/mdio/mdio-mscc-miim.c
> index 1ee592d3eae4..17f98f609ec8 100644
> --- a/drivers/net/mdio/mdio-mscc-miim.c
> +++ b/drivers/net/mdio/mdio-mscc-miim.c
> @@ -134,8 +134,9 @@ static int mscc_miim_reset(struct mii_bus *bus)
>  
>  static int mscc_miim_probe(struct platform_device *pdev)
>  {
> -	struct mii_bus *bus;
>  	struct mscc_miim_dev *dev;
> +	struct resource *res;
> +	struct mii_bus *bus;
>  	int ret;
>  
>  	bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*dev));
> @@ -156,10 +157,14 @@ static int mscc_miim_probe(struct platform_device *pdev)
>  		return PTR_ERR(dev->regs);
>  	}
>  
> -	dev->phy_regs = devm_platform_ioremap_resource(pdev, 1);
> -	if (IS_ERR(dev->phy_regs)) {
> -		dev_err(&pdev->dev, "Unable to map internal phy registers\n");
> -		return PTR_ERR(dev->phy_regs);
> +	/* This resource is optional */
Looks good to me,

Thanks,
Cai
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> +	if (res) {
> +		dev->phy_regs = devm_ioremap_resource(&pdev->dev, res);
> +		if (IS_ERR(dev->phy_regs)) {
> +			dev_err(&pdev->dev, "Unable to map internal phy registers\n");
> +			return PTR_ERR(dev->phy_regs);
> +		}
>  	}
>  
>  	ret = of_mdiobus_register(bus, pdev->dev.of_node);
> -- 
> 2.33.0
>