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Date:   Wed, 13 May 2020 15:12:26 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Huazhong Tan <tanhuazhong@...wei.com>
Cc:     f.fainelli@...il.com, hkallweit1@...il.com, linux@...linux.org.uk,
        davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linuxarm@...wei.com, kuba@...nel.org,
        Yufeng Mo <moyufeng@...wei.com>,
        Jian Shen <shenjian15@...wei.com>
Subject: Re: [PATCH net-next] net: phy: realtek: add loopback support for
 RTL8211F

On Wed, May 13, 2020 at 04:25:44PM +0800, Huazhong Tan wrote:
> From: Yufeng Mo <moyufeng@...wei.com>
> 
> PHY loopback is already supported by genphy driver. This patch
> adds the set_loopback interface to RTL8211F PHY driver, so the PHY
> selftest can run properly on it.
> 
> Signed-off-by: Yufeng Mo <moyufeng@...wei.com>
> Signed-off-by: Jian Shen <shenjian15@...wei.com>
> Signed-off-by: Huazhong Tan <tanhuazhong@...wei.com>

It took three people to write a 1 line patch?

> ---
>  drivers/net/phy/realtek.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c
> index c7229d0..6c5918c 100644
> --- a/drivers/net/phy/realtek.c
> +++ b/drivers/net/phy/realtek.c
> @@ -615,6 +615,7 @@ static struct phy_driver realtek_drvs[] = {
>  		.resume		= genphy_resume,
>  		.read_page	= rtl821x_read_page,
>  		.write_page	= rtl821x_write_page,
> +		.set_loopback   = genphy_loopback,
>  	}, {
>  		.name		= "Generic FE-GE Realtek PHY",
>  		.match_phy_device = rtlgen_match_phy_device,

Do you have access to the data sheets? Can you check if the other PHYs
supported by this driver also support loopback in the standard way?
They probably do.

	  Andrew

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