linux-kernel - Re: [PATCH net-next v1 07/10] net: dsa: microchip: warn about not supported synclko properties on KSZ9893 chips

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Message-ID: <20220802113633.73rxlb2kmihivwpx@skbuf>
Date:   Tue, 2 Aug 2022 14:36:33 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com, 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 07/10] net: dsa: microchip: warn about not
 supported synclko properties on KSZ9893 chips

On Fri, Jul 29, 2022 at 03:03:43PM +0200, Oleksij Rempel wrote:
> KSZ9893 family of chips do not support synclko property. So warn about
> without preventing driver from start.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> ---
>  drivers/net/dsa/microchip/ksz_common.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
> index 71b5349d006a..d3a9836c706f 100644
> --- a/drivers/net/dsa/microchip/ksz_common.c
> +++ b/drivers/net/dsa/microchip/ksz_common.c
> @@ -1916,6 +1916,13 @@ int ksz_switch_register(struct ksz_device *dev)
>  			dev_err(dev->dev, "inconsistent synclko settings\n");
>  			return -EINVAL;
>  		}
> +
> +		if (dev->chip_id == KSZ9893_CHIP_ID && (dev->synclko_125 ||
> +							dev->synclko_disable)) {
> +			dev_warn(dev->dev, "microchip,synclko-125 and microchip,synclko-disable "
> +				 "properties are not supported on this chip. "
> +				 "Please fix you devicetree.\n");

s/you/your/

Does KSZ8 have a REFCLK output of any sort? If it doesn't, then
"microchip,synclko-disable" is kind of supported, right?

I wonder what there is to gain by saying that you should remove some
device tree properties from non-ksz9477. After all, anyone can add any
random properties to a KSZ8 switch OF node and you won't warn about
those.

> +		}
>  	}
>  
>  	ret = dsa_register_switch(dev->ds);
> -- 
> 2.30.2
>