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 19:16:06 +0100
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Michael Walle <michael@...le.cc>
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

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 */

Bit 7 is the EEE clock stop capability, set when supported.  Tick.

> +#define MDIO_LPA_USXGMII_EEE		0x0100	/* EEE supported */

Bit 8 is the EEE capability, set when supported.  Tick.

> +#define MDIO_LPA_USXGMII_SPD_MASK	0x0e00	/* USXGMII speed mask */

Bits 9 through 11 are the speed.  Tick.

> +#define MDIO_LPA_USXGMII_FULL_DUPLEX	0x1000	/* USXGMII full duplex */

Bit 12 is the duplex mode, set for full, clear for half.  Tick.

> +#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 */

Bit 15 is the link bit, set for link up.  Tick.

The speed bits correspond (they're a little harder to check, it would
have been easier for them to be 2 << 9 etc), tick.

The speed+duplex bits correspond (same issue with the raw speed bits,
defining them as MDIO_LPA_USXGMII_1000 | MDIO_LPA_USXGMII_FULL_DUPLEX
would've made them more obvious, but at the expense of being more
long winded), tick.

Reviewed-by: Russell King <rmk+kernel@...linux.org.uk>

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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