netdev - Re: [PATCH net 1/2] of: of_mdio: Add a whitelist of PHY compatibilities.

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Date:	Wed, 27 Jan 2016 13:17:27 +0200
From:	Aaro Koskinen <aaro.koskinen@...ia.com>
To:	Andrew Lunn <andrew@...n.ch>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Florian Fainelli <f.fainelli@...il.com>, olof@...om.net
Subject: Re: [PATCH net 1/2] of: of_mdio: Add a whitelist of PHY
 compatibilities.

Hi,

On Wed, Jan 27, 2016 at 01:11:38AM +0100, Andrew Lunn wrote:
> Some phy nodes list a compatible value indicating the PHY make/model.
> This is never used to match the device to the driver. However it does
> confuse the code to separate a PHY from a generic MDIO device like a
> switch. Generic MDIO devices must have a compatible value, PHYs can
> list clause 22 or 45, but nothing else.
> 
> Issue a warning if we find a compatible value known on the whitelist,
> and say it is a PHY.
> 
> Fixes: a9049e0c513c ("mdio: Add support for mdio drivers.")
> Reported-by: Aaro Koskinen <aaro.koskinen@...ia.com>
> Reported-by: Olof Johansson <olof@...om.net>
> Signed-off-by: Andrew Lunn <andrew@...n.ch>

Tested-by: Aaro Koskinen <aaro.koskinen@...ia.com>

A.

> ---
>  drivers/of/of_mdio.c | 27 +++++++++++++++++++++++++++
>  1 file changed, 27 insertions(+)
> 
> diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
> index b5aa004a24b6..26c245041493 100644
> --- a/drivers/of/of_mdio.c
> +++ b/drivers/of/of_mdio.c
> @@ -143,11 +143,31 @@ int of_mdio_parse_addr(struct device *dev, const struct device_node *np)
>  }
>  EXPORT_SYMBOL(of_mdio_parse_addr);
>  
> +/* The following is a list of PHY compatible strings which appear in
> + * some DTBs. The compatible string is never matched against a PHY
> + * driver, so is pointless. We only expect devices which are not PHYs
> + * to have a compatible string, so they can be matched to an MDIO
> + * driver.  Encourage users to upgrade there DT blobs to remove these.
> + */
> +static const struct of_device_id whitelist_phys[] = {
> +	{ .compatible = "brcm,40nm-ephy" },
> +	{ .compatible = "marvell,88E1111", },
> +	{ .compatible = "marvell,88e1116", },
> +	{ .compatible = "marvell,88e1118", },
> +	{ .compatible = "marvell,88e1149r", },
> +	{ .compatible = "marvell,88e1310", },
> +	{ .compatible = "marvell,88E1510", },
> +	{ .compatible = "marvell,88E1514", },
> +	{ .compatible = "moxa,moxart-rtl8201cp", },
> +	{}
> +};
> +
>  /*
>   * Return true if the child node is for a phy. It must either:
>   * o Compatible string of "ethernet-phy-idX.X"
>   * o Compatible string of "ethernet-phy-ieee802.3-c45"
>   * o Compatible string of "ethernet-phy-ieee802.3-c22"
> + * o In the white list above (and issue a warning)
>   * o No compatibility string
>   *
>   * A device which is not a phy is expected to have a compatible string
> @@ -166,6 +186,13 @@ static bool of_mdiobus_child_is_phy(struct device_node *child)
>  	if (of_device_is_compatible(child, "ethernet-phy-ieee802.3-c22"))
>  		return true;
>  
> +	if (of_match_node(whitelist_phys, child)) {
> +		pr_warn(FW_WARN
> +			"%s: Whitelisted compatible string. Please remove\n",
> +			child->full_name);
> +		return true;
> +	}
> +
>  	if (!of_find_property(child, "compatible", NULL))
>  		return true;
>  
> -- 
> 2.7.0
>