netdev - Re: [PATCH net-next] drivers: net: xgene: Check all RGMII phy mode variants

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Date:   Wed, 17 May 2017 14:33:40 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Iyappan Subramanian <isubramanian@....com>,
        Andrew Lunn <andrew@...n.ch>
Cc:     David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>, patches <patches@....com>,
        Quan Nguyen <qnguyen@....com>
Subject: Re: [PATCH net-next] drivers: net: xgene: Check all RGMII phy mode
 variants

On 05/17/2017 02:29 PM, Iyappan Subramanian wrote:
> On Wed, May 17, 2017 at 1:26 PM, Andrew Lunn <andrew@...n.ch> wrote:
>>> +bool is_xgene_enet_phy_mode_rgmii(struct net_device *ndev)
>>> +{
>>> +     struct xgene_enet_pdata *pdata = netdev_priv(ndev);
>>> +     int phy_mode = pdata->phy_mode;
>>> +     bool ret;
>>> +
>>> +     ret = phy_mode == PHY_INTERFACE_MODE_RGMII ||
>>> +           phy_mode == PHY_INTERFACE_MODE_RGMII_ID ||
>>> +           phy_mode == PHY_INTERFACE_MODE_RGMII_RXID ||
>>> +           phy_mode == PHY_INTERFACE_MODE_RGMII_TXID;
>>> +
>>> +     return ret;
>>> +}
>>
>> include/linux/phy.h:
>>
>> /**
>>  * phy_interface_is_rgmii - Convenience function for testing if a PHY interface
>>  * is RGMII (all variants)
>>  * @phydev: the phy_device struct
>>  */
>> static inline bool phy_interface_is_rgmii(struct phy_device *phydev)
>> {
>>         return phydev->interface >= PHY_INTERFACE_MODE_RGMII &&
>>                 phydev->interface <= PHY_INTERFACE_MODE_RGMII_TXID;
>> };
> 
> Thanks.  I'll use this helper function.

If you can use it, that's great, the reason why I did not recommend
using it before was because it takes a phydev reference and your code
clearly could have run before connecting to the PHY device.

Alternatively, we could introduce a helper function that just checks a
phy_interface_t type, something like:

static inline bool phy_interface_is_rgmii(phy_interface_t mode)
{
	...
}

and introduce:

static inline bool phydev_interface_is_rgmii(struct phy_device *phydev)
{
	return phy_interface_is_rgmii(phydev->interface);
}

which would use this helper function internally. Or just drop the second
helper, and always pass phydev->interface where needed.
-- 
Florian