linux-kernel - Re: [PATCH net-next] net: stmmac: Fix the case when PHY handle is not present

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Date:   Tue, 25 Jun 2019 13:29:20 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Jose Abreu <Jose.Abreu@...opsys.com>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Cc:     Joao Pinto <Joao.Pinto@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>
Subject: Re: [PATCH net-next] net: stmmac: Fix the case when PHY handle is not
 present

Hello!

On 25.06.2019 11:19, Jose Abreu wrote:

> Some DT bindings do not have the PHY handle. Let's fallback to manually
> discovery in case phylink_of_phy_connect() fails.
> 
> Reported-by: Katsuhiro Suzuki <katsuhiro@...suster.net>
> Fixes: 74371272f97f ("net: stmmac: Convert to phylink and remove phylib logic")
> Signed-off-by: Jose Abreu <joabreu@...opsys.com>
> Cc: Joao Pinto <jpinto@...opsys.com>
> Cc: David S. Miller <davem@...emloft.net>
> Cc: Giuseppe Cavallaro <peppe.cavallaro@...com>
> Cc: Alexandre Torgue <alexandre.torgue@...com>
> ---
> Hello Katsuhiro,
> 
> Can you please test this patch ?
> ---
>   drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 7 +++++--
>   1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index a48751989fa6..f4593d2d9d20 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -950,9 +950,12 @@ static int stmmac_init_phy(struct net_device *dev)
>   
>   	node = priv->plat->phylink_node;
>   
> -	if (node) {
> +	if (node)
>   		ret = phylink_of_phy_connect(priv->phylink, node, 0);
> -	} else {
> +
> +	/* Some DT bindings do not set-up the PHY handle. Let's try to
> +	 * manually parse it */

    The multi-line comments inb the networking code should be formatted like 
below:

	/*
	 * bla
	 * bla
	 */

> +	if (!node || ret) {
>   		int addr = priv->plat->phy_addr;
>   		struct phy_device *phydev;
>   

MBR, Sergei