linux-kernel - Re: [PATCH net-next v1 1/1] net: dsa: sja1105: silent spi_device

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Date:   Thu, 30 Jun 2022 19:10:59 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v1 1/1] net: dsa: sja1105: silent spi_device_id
 warnings

On Thu, Jun 30, 2022 at 09:10:13AM +0200, Oleksij Rempel wrote:
> Add spi_device_id entries to silent following warnings:
>  SPI driver sja1105 has no spi_device_id for nxp,sja1105e
>  SPI driver sja1105 has no spi_device_id for nxp,sja1105t
>  SPI driver sja1105 has no spi_device_id for nxp,sja1105p
>  SPI driver sja1105 has no spi_device_id for nxp,sja1105q
>  SPI driver sja1105 has no spi_device_id for nxp,sja1105r
>  SPI driver sja1105 has no spi_device_id for nxp,sja1105s
>  SPI driver sja1105 has no spi_device_id for nxp,sja1110a
>  SPI driver sja1105 has no spi_device_id for nxp,sja1110b
>  SPI driver sja1105 has no spi_device_id for nxp,sja1110c
>  SPI driver sja1105 has no spi_device_id for nxp,sja1110d
> 
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> ---
>  drivers/net/dsa/sja1105/sja1105_main.c | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c
> index b253e27bcfb4..b03d0d0c3dbf 100644
> --- a/drivers/net/dsa/sja1105/sja1105_main.c
> +++ b/drivers/net/dsa/sja1105/sja1105_main.c
> @@ -3382,12 +3382,28 @@ static const struct of_device_id sja1105_dt_ids[] = {
>  };
>  MODULE_DEVICE_TABLE(of, sja1105_dt_ids);
>  
> +static const struct spi_device_id sja1105_spi_ids[] = {
> +	{ "sja1105e" },
> +	{ "sja1105t" },
> +	{ "sja1105p" },
> +	{ "sja1105q" },
> +	{ "sja1105r" },
> +	{ "sja1105s" },
> +	{ "sja1110a" },
> +	{ "sja1110b" },
> +	{ "sja1110c" },
> +	{ "sja1110d" },
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(spi, sja1105_spi_ids);
> +
>  static struct spi_driver sja1105_driver = {
>  	.driver = {
>  		.name  = "sja1105",
>  		.owner = THIS_MODULE,
>  		.of_match_table = of_match_ptr(sja1105_dt_ids),
>  	},
> +	.id_table = sja1105_spi_ids,
>  	.probe  = sja1105_probe,
>  	.remove = sja1105_remove,
>  	.shutdown = sja1105_shutdown,
> -- 
> 2.30.2
> 

Do we also need these?

MODULE_ALIAS("spi:sja1105e");
MODULE_ALIAS("spi:sja1105t");
MODULE_ALIAS("spi:sja1105p");
MODULE_ALIAS("spi:sja1105q");
MODULE_ALIAS("spi:sja1105r");
MODULE_ALIAS("spi:sja1105s");
MODULE_ALIAS("spi:sja1110a");
MODULE_ALIAS("spi:sja1110b");
MODULE_ALIAS("spi:sja1110c");
MODULE_ALIAS("spi:sja1110d");

To be honest I don't do much testing with modules at all, so I'm not
sure if udev-based module loading is broken or not. I remember becoming
vaguely curious after commit 5fa6863ba692 ("spi: Check we have a
spi_device_id for each DT compatible"), and I did some basic testing
without the spi_device_id table and MODULE_ALIASes, and it appeared that
udev could still autoload the sja1105 kernel module just fine.
So I'm not really sure what's broken.