From mboxrd@z Thu Jan  1 00:00:00 1970
From: Florian Fainelli <f.fainelli@gmail.com>
Subject: Re: [PATCH] net: dsa: set slave MII bus PHY mask
Date: Tue, 20 Jan 2015 16:37:35 -0800
Message-ID: <54BEF4CF.806@gmail.com>
References: <1421799212-2028-1-git-send-email-vivien.didelot@savoirfairelinux.com> <1421799212-2028-2-git-send-email-vivien.didelot@savoirfairelinux.com>
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Cc: "David S . Miller" <davem@davemloft.net>,
	linux-kernel@vger.kernel.org, kernel@savoirfairelinux.com
To: Vivien Didelot <vivien.didelot@savoirfairelinux.com>,
	netdev@vger.kernel.org
Return-path: <linux-kernel-owner@vger.kernel.org>
In-Reply-To: <1421799212-2028-2-git-send-email-vivien.didelot@savoirfairelinux.com>
Sender: linux-kernel-owner@vger.kernel.org
List-Id: netdev.vger.kernel.org

On 20/01/15 16:13, Vivien Didelot wrote:
> When registering a mdio bus, Linux assumes than every port has a PHY and tries
> to scan it. If a switch port has no PHY registered, DSA will fail to register
> the slave MII bus. To fix this, set the slave MII bus PHY mask to the switch
> PHYs mask.
> 
> As an example, if we use a Marvell MV88E6352 (which is a 7-port switch with no
> registered PHYs for port 5 and port 6), with the following declared names:
> 
> 	static struct dsa_chip_data switch_cdata = {
> 		[...]
> 		.port_names[0] = "sw0",
> 		.port_names[1] = "sw1",
> 		.port_names[2] = "sw2",
> 		.port_names[3] = "sw3",
> 		.port_names[4] = "sw4",
> 		.port_names[5] = "cpu",
> 	};
> 
> DSA will fail to create the switch instance. With the PHY mask set for the
> slave MII bus, only the PHY for ports 0-4 will be scanned and the instance will
> be successfully created.
> 
> Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>

Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>

> ---
>  net/dsa/slave.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/net/dsa/slave.c b/net/dsa/slave.c
> index 515569f..589aafd 100644
> --- a/net/dsa/slave.c
> +++ b/net/dsa/slave.c
> @@ -46,6 +46,7 @@ void dsa_slave_mii_bus_init(struct dsa_switch *ds)
>  	snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d:%.2x",
>  			ds->index, ds->pd->sw_addr);
>  	ds->slave_mii_bus->parent = ds->master_dev;
> +	ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
>  }
>  
>  
> 


-- 
Florian