netdev - Re: [PATCH v3 net-next v3 13/14] net: dsa: mv88e6xxx: add addressing mode to info

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Date:	Sat, 18 Jun 2016 17:18:24 -0400
From:	Vivien Didelot <vivien.didelot@...oirfairelinux.com>
To:	Andrew Lunn <andrew@...n.ch>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel@...oirfairelinux.com,
	"David S. Miller" <davem@...emloft.net>,
	Florian Fainelli <f.fainelli@...il.com>,
	Ben Dooks <ben.dooks@...ethink.co.uk>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Subject: Re: [PATCH v3 net-next v3 13/14] net: dsa: mv88e6xxx: add addressing mode to info

Hi Andrew,

Andrew Lunn <andrew@...n.ch> writes:

>> +struct mv88e6xxx_smi_ops {
>> +	int (*read)(struct mii_bus *bus, int sw_addr,
>> +		    int addr, int reg, u16 *val);
>> +	int (*write)(struct mii_bus *bus, int sw_addr,
>> +		     int addr, int reg, u16 val);
>> +};
>
> Hi Vivien
>
> I still think this API should be based on ps.
>
> With the way you have restructured probe, this now also works, there
> is no longer a read without PS in order to get the device ID.
>
> Also, think about the case of reading/writing registers via Ethernet
> frames. Such functions would need ps, bus and sw_addr is not useful.

Yes, I do RMU in mind, that was one motivation behind isolating
SMI-specific pieces of code.

I considered mv88e6xxx_smi_ops private to the SMI (MDIO) access, needing
an additional abstraction for regs access operations.

But I can indeed rename mv88e6xxx_smi_ops to mv88e6xxx_ops and make them
use a ps before one day, implementing an optional ps->rmu_ops.

Thanks,

        Vivien