linux-kernel - Re: [PATCH v2 net-next v2 12/12] net: dsa: mv88e6xxx: add addressing mode to info

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Message-ID: <871t3z1ka6.fsf@ketchup.mtl.sfl>
Date:	Tue, 14 Jun 2016 18:24:17 -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>
Subject: Re: [PATCH v2 net-next v2 12/12] net: dsa: mv88e6xxx: add addressing mode to info

Hi Andrew,

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

>> -	ret = mdiobus_read_nested(bus, addr, reg);
>> +	ret = mdiobus_read_nested(bus, sw_addr + addr, reg);
>>  	if (ret < 0)
>>  		return ret;
>
> If we are doing direct access, doesn't it means sw_addr is 0?
>
> So isn't this pointless?

6060 has no indirect access and directly responds to 16 SMI addresses,
regardless its chip address which can be strapped to either 0 or 16.

If we want to add support for it in mv88e6xxx someday (which is likely),
the code is ready for that.

Question 1) given this, should I still consider your first comment on
this patch about the mv88e6xxx_smi_ops assignment?

Question 2) is MV88E6XXX_FLAG_MULTI_CHIP confusing? I took a short name
for style but maybe a longer MV88E6XXX_FLAG_MULTI_CHIP_ADDRESSING or
MV88E6XXX_FLAG_MULTI_CHIP_MODE would be clearer to make to distinction
between "Single-chip Addressing Mode" and "Multi-chip Addressing Mode".

Thanks,

        Vivien