netdev - Re: [PATCH net-next v6 1/4] net: phy: add USXGMII link partner ability constants

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Date:   Mon, 13 Jul 2020 20:37:01 +0200
From:   Michael Walle <michael@...le.cc>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Vladimir Oltean <olteanv@...il.com>,
        Alex Marginean <alexandru.marginean@....com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Heiko Thiery <heiko.thiery@...il.com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>
Subject: Re: [PATCH net-next v6 1/4] net: phy: add USXGMII link partner
 ability constants

Am 2020-07-13 20:23, schrieb Russell King - ARM Linux admin:
> On Thu, Jul 09, 2020 at 11:35:23PM +0200, Michael Walle wrote:
>> The constants are taken from the USXGMII Singleport Copper Interface
>> specification. The naming are based on the SGMII ones, but with an 
>> MDIO_
>> prefix.
>> 
>> Signed-off-by: Michael Walle <michael@...le.cc>
>> ---
>>  include/uapi/linux/mdio.h | 26 ++++++++++++++++++++++++++
>>  1 file changed, 26 insertions(+)
>> 
>> diff --git a/include/uapi/linux/mdio.h b/include/uapi/linux/mdio.h
>> index 4bcb41c71b8c..784723072578 100644
>> --- a/include/uapi/linux/mdio.h
>> +++ b/include/uapi/linux/mdio.h
>> @@ -324,4 +324,30 @@ static inline __u16 mdio_phy_id_c45(int prtad, 
>> int devad)
>>  	return MDIO_PHY_ID_C45 | (prtad << 5) | devad;
>>  }
>> 
>> +/* UsxgmiiChannelInfo[15:0] for USXGMII in-band auto-negotiation.*/
>> +#define MDIO_LPA_USXGMII_EEE_CLK_STP	0x0080	/* EEE clock stop 
>> supported */
>> +#define MDIO_LPA_USXGMII_EEE		0x0100	/* EEE supported */
>> +#define MDIO_LPA_USXGMII_SPD_MASK	0x0e00	/* USXGMII speed mask */
>> +#define MDIO_LPA_USXGMII_FULL_DUPLEX	0x1000	/* USXGMII full duplex */
>> +#define MDIO_LPA_USXGMII_DPX_SPD_MASK	0x1e00	/* USXGMII duplex and 
>> speed bits */
>> +#define MDIO_LPA_USXGMII_10		0x0000	/* 10Mbps */
>> +#define MDIO_LPA_USXGMII_10HALF		0x0000	/* 10Mbps half-duplex */
>> +#define MDIO_LPA_USXGMII_10FULL		0x1000	/* 10Mbps full-duplex */
>> +#define MDIO_LPA_USXGMII_100		0x0200	/* 100Mbps */
>> +#define MDIO_LPA_USXGMII_100HALF	0x0200	/* 100Mbps half-duplex */
>> +#define MDIO_LPA_USXGMII_100FULL	0x1200	/* 100Mbps full-duplex */
>> +#define MDIO_LPA_USXGMII_1000		0x0400	/* 1000Mbps */
>> +#define MDIO_LPA_USXGMII_1000HALF	0x0400	/* 1000Mbps half-duplex */
>> +#define MDIO_LPA_USXGMII_1000FULL	0x1400	/* 1000Mbps full-duplex */
>> +#define MDIO_LPA_USXGMII_10G		0x0600	/* 10Gbps */
>> +#define MDIO_LPA_USXGMII_10GHALF	0x0600	/* 10Gbps half-duplex */
>> +#define MDIO_LPA_USXGMII_10GFULL	0x1600	/* 10Gbps full-duplex */
>> +#define MDIO_LPA_USXGMII_2500		0x0800	/* 2500Mbps */
>> +#define MDIO_LPA_USXGMII_2500HALF	0x0800	/* 2500Mbps half-duplex */
>> +#define MDIO_LPA_USXGMII_2500FULL	0x1800	/* 2500Mbps full-duplex */
>> +#define MDIO_LPA_USXGMII_5000		0x0a00	/* 5000Mbps */
>> +#define MDIO_LPA_USXGMII_5000HALF	0x0a00	/* 5000Mbps half-duplex */
>> +#define MDIO_LPA_USXGMII_5000FULL	0x1a00	/* 5000Mbps full-duplex */
>> +#define MDIO_LPA_USXGMII_LINK		0x8000	/* PHY link with copper-side 
>> partner */
> 
> btw, the only thing which is missing from this is bit 0.

TBH, I didn't know how to name it. Any suggestions?

> One other point - in the USXGMII specification, this appears to be
> somewhat symmetrical - the same definitions are listed as being
> used for PHY to MAC as for MAC to PHY (presumably as part of the
> acknowledgement that the MAC actually switched to that speed.)
> So, it probably makes sense to drop the LPA_ infix.

Ok. I'll send a new version, once we have a name for bit 0.

-michael