linux-kernel - Re: [PATCH RESEND net-next] net: dsa: felix: allow the device to be disabled

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Date:   Mon, 4 May 2020 20:47:39 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Michael Walle <michael@...le.cc>
Cc:     "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        lkml <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Shawn Guo <shawnguo@...nel.org>
Subject: Re: [PATCH RESEND net-next] net: dsa: felix: allow the device to be disabled

On Mon, 4 May 2020 at 19:55, Michael Walle <michael@...le.cc> wrote:
>
> If there is no specific configuration of the felix switch in the device
> tree, but only the default configuration (ie. given by the SoCs dtsi
> file), the probe fails because no CPU port has been set. On the other
> hand you cannot set a default CPU port because that depends on the
> actual board using the switch.
>
> [    2.701300] DSA: tree 0 has no CPU port
> [    2.705167] mscc_felix 0000:00:00.5: Failed to register DSA switch: -22
> [    2.711844] mscc_felix: probe of 0000:00:00.5 failed with error -22
>
> Thus let the device tree disable this device entirely, like it is also
> done with the enetc driver of the same SoC.
>
> Signed-off-by: Michael Walle <michael@...le.cc>
> ---

Reviewed-by: Vladimir Oltean <vladimir.oltean@....com>

> This was part of a two patch series. The second patch is already merged.
> This patch was never picked up, although it was Acked-by: David Miller,
> see:
> https://lore.kernel.org/netdev/20200314.205335.907987569817755804.davem@davemloft.net/
>
> Since there is no more dependency, this patch could go through the
> net-next queue.
>
>  drivers/net/dsa/ocelot/felix.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/drivers/net/dsa/ocelot/felix.c b/drivers/net/dsa/ocelot/felix.c
> index 69546383a382..531c7710063f 100644
> --- a/drivers/net/dsa/ocelot/felix.c
> +++ b/drivers/net/dsa/ocelot/felix.c
> @@ -699,6 +699,11 @@ static int felix_pci_probe(struct pci_dev *pdev,
>         struct felix *felix;
>         int err;
>
> +       if (pdev->dev.of_node && !of_device_is_available(pdev->dev.of_node)) {
> +               dev_info(&pdev->dev, "device is disabled, skipping\n");
> +               return -ENODEV;
> +       }
> +
>         err = pci_enable_device(pdev);
>         if (err) {
>                 dev_err(&pdev->dev, "device enable failed\n");
> --
> 2.20.1
>

Thanks, Michael!
-Vladimir