linux-kernel - Re: [net-next 1/2] net: ethernet: slicoss: add slicoss gigabit ethernet driver

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Date:   Wed, 16 Nov 2016 00:14:44 +0100
From:   Lino Sanfilippo <LinoSanfilippo@....de>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Florian Fainelli <f.fainelli@...il.com>, davem@...emloft.net,
        charrer@...critech.com, liodot@...il.com,
        gregkh@...uxfoundation.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [net-next 1/2] net: ethernet: slicoss: add slicoss gigabit
 ethernet driver

On 16.11.2016 00:03, Andrew Lunn wrote:
>> >>>>> +  			val = MII_BMCR << 16 | SLIC_PCR_AUTONEG |
>> >>>>> +		     	         SLIC_PCR_AUTONEG_RST;
>> >>>>> +			slic_write(sdev, SLIC_REG_WPHY, val);
> 
>> Thats essentially what I meant by setting a flag in the irq handler. The mdio
>> function would have to check somehow if the irq has been fired (be it by means
>> of a flag or a completion that is set by the irq handler and checked by the 
>> mdio function). So I agree that it should work (if reading via the AP command
>> is actually possible).
> 
> It seems odd you have a nice simple way to do writes, but reads are
> very complex. There might be a simple read method hiding somewhere.
> 
>      Andrew
> 

I agree, it IS odd :). 
But concerning reading the phy this is all I can see in the original source code:

http://lxr.free-electrons.com/source/drivers/staging/slicoss/slichw.h#L516

I strongly suspect that "RPHY" stand for "read phy". The only one who may
know for sure if there is another/better way is Christopher Harrer. He is also on CC
but I am not sure if he actually follows this discussion.

Lino