netdev - Re: [PATCH 18/18] net: dsa: microchip: Check return value of of_get_phy

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Date: Tue, 13 Feb 2024 03:19:35 +0000
From: <Arun.Ramadoss@...rochip.com>
To: <Woojung.Huh@...rochip.com>, <d.dulov@...ddin.ru>
CC: <andrew@...n.ch>, <olteanv@...il.com>, <davem@...emloft.net>,
	<vivien.didelot@...il.com>, <helmut.grohne@...enta.de>,
	<linux-kernel@...r.kernel.org>, <f.fainelli@...il.com>,
	<alexandre.belloni@...tlin.com>, <UNGLinuxDriver@...rochip.com>,
	<kuba@...nel.org>, <lvc-project@...uxtesting.org>, <netdev@...r.kernel.org>
Subject: Re: [PATCH 18/18] net: dsa: microchip: Check return value of
 of_get_phy_mode()

Hi Daniil,

On Sun, 2024-02-11 at 07:08 -0800, Daniil Dulov wrote:
>  drivers/net/dsa/microchip/ksz_common.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/dsa/microchip/ksz_common.c
> b/drivers/net/dsa/microchip/ksz_common.c
> index e3c338624b95..faffce6ea1e1 100644
> --- a/drivers/net/dsa/microchip/ksz_common.c
> +++ b/drivers/net/dsa/microchip/ksz_common.c
> @@ -434,8 +434,10 @@ int ksz_switch_register(struct ksz_device *dev,
>                                         continue;
>                                 if (port_num >= dev->mib_port_cnt)
>                                         return -EINVAL;
> -                               of_get_phy_mode(port,
> +                               ret = of_get_phy_mode(port,
>                                                 &dev-
> >ports[port_num].interface);
> +                               if (ret)
> +                                   return ret;

If phy mode is not defined in device tree, can phy mode have some
default mode like internal or rgmii_tx_id.

If this field is mandatory to be specified in device tree, Then instead
of just returning, it will be good to return with dev_err message, so
the user will be aware of whats wrong with the driver.

>                         }
>                 dev->synclko_125 = of_property_read_bool(dev->dev-
> >of_node,
>                                                          "microchip,s
> ynclko-125");
> --
> 2.25.1
>