netdev - Re: [PATCH net-next v5 1/1] net: dsa: mv88e6xxx: implement USXGMII mode for mv88e6393x

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Date: Thu, 1 Jun 2023 23:42:48 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: msmulski2@...il.com
Cc: andrew@...n.ch, f.fainelli@...il.com, olteanv@...il.com,
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, simon.horman@...igine.com,
	kabel@...nel.org, Michal Smulski <michal.smulski@...a.com>
Subject: Re: [PATCH net-next v5 1/1] net: dsa: mv88e6xxx: implement USXGMII
 mode for mv88e6393x

On Thu, Jun 01, 2023 at 02:52:51PM -0700, msmulski2@...il.com wrote:
> +/* USXGMII */
> +#define MV88E6390_USXGMII_PHY_STATUS_SPEED_MASK	GENMASK(11, 9)
> +#define MV88E6390_USXGMII_PHY_STATUS_SPEED_5000	0xa00
> +#define MV88E6390_USXGMII_PHY_STATUS_SPEED_2500	0x800
> +#define MV88E6390_USXGMII_PHY_STATUS_SPEED_10000	0x600
> +#define MV88E6390_USXGMII_PHY_STATUS_SPEED_1000	0x400
> +#define MV88E6390_USXGMII_PHY_STATUS_SPEED_100	0x200
> +#define MV88E6390_USXGMII_PHY_STATUS_SPEED_10	0x000
> +#define MV88E6390_USXGMII_PHY_STATUS_DUPLEX_FULL	BIT(12)
> +#define MV88E6390_USXGMII_PHY_STATUS_LINK		BIT(15)

How is this different from the definitions in include/uapi/linux/mdio.h
(see MDIO_USXGMII_*). Have you considered using
phylink_decode_usxgmii_word() to decode these instead of reinventing the
wheel?

It would be nice to wait until we've converted 88e6xxx to phylink PCS
before adding this support, which is something that's been blocked for
a few years but should be unblocked either at the end of this cycle,
or certainly by 6.5-rc1. Andrew, would you agree?

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