linux-kernel - Re: [PATCH 1/2] net: phy: Helper function for reading strapped configuration values

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Message-ID: <87a7uhjstx.fsf@haabendal.dk>
Date:   Thu, 05 Apr 2018 22:34:18 +0200
From:   Esben Haabendal <esben.haabendal@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        "open list\:ETHERNET PHY LIBRARY" <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Rasmus Villemoes <rasmus.villemoes@...vas.dk>
Subject: Re: [PATCH 1/2] net: phy: Helper function for reading strapped configuration values

Florian Fainelli <f.fainelli@...il.com> writes:

> On 04/05/2018 04:44 AM, esben.haabendal@...il.com wrote:
>> From: Esben Haabendal <eha@...f.com>
>> 
>> Add a function for use in PHY driver probe functions, reading current
>> autoneg, speed and duplex configuration from BMCR register.
>> 
>> Useful for PHY that supports hardware strapped configuration, enabling
>> Linux to respect that configuration (i.e. strapped non-autoneg
>> configuration).
>> 
>> Signed-off-by: Esben Haabendal <eha@...f.com>
>> Cc: Rasmus Villemoes <rasmus.villemoes@...vas.dk>
>> ---
>>  drivers/net/phy/phy_device.c | 41 +++++++++++++++++++++++++++++++++++++++++
>>  include/linux/phy.h          |  1 +
>>  2 files changed, 42 insertions(+)
>> 
>> diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
>> index 74664a6c0cdc..cc52ff2a2344 100644
>> --- a/drivers/net/phy/phy_device.c
>> +++ b/drivers/net/phy/phy_device.c
>> @@ -1673,6 +1673,47 @@ int genphy_config_init(struct phy_device *phydev)
>>  }
>>  EXPORT_SYMBOL(genphy_config_init);
>>  
>> +/**
>> + * genphy_read_config - read configuration from PHY
>> + * @phydev: target phy_device struct
>> + *
>> + * Description: Reads MII_BMCR and sets phydev autoneg, speed and duplex
>> + * accordingly.  For use in driver probe functions, to respect strapped
>> + * configuration settings.
>> + */
>> +int genphy_read_config(struct phy_device *phydev)
>
> This duplicates what already exists, in part at least within
> genphy_read_status() can you find a way to use that?

Make a small static function for updating duplex and speed fields from a
BMCR value.  It will not be big re-use, but it would make sense.  I will
do that in next patch version.

/Esben