Subject: Re: [PATCH net-next] net: phy: realtek: add loopback support for RTL8211F

From: Andrew Lunn <[email-masked]>
Date: Wed, 13 May 2020 15:12:26 +0200

On Wed, May 13, 2020 at 04:25:44PM +0800, Huazhong Tan wrote:
> From: Yufeng Mo <[email-masked]>
> 
> 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 <[email-masked]>
> Signed-off-by: Jian Shen <[email-masked]>
> Signed-off-by: Huazhong Tan <[email-masked]>

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