netdev - Re: [net-next 1/4] phy: add the EEE support and the way to access to the MMD regs

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Message-ID: <1331053557.2333.19.camel@bwh-desktop>
Date:	Tue, 6 Mar 2012 17:05:57 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Giuseppe CAVALLARO <peppe.cavallaro@...com>
CC:	<netdev@...r.kernel.org>, <davem@...emloft.net>,
	<rayagond@...avyalabs.com>
Subject: Re: [net-next 1/4] phy: add the EEE support and the way to access
 to the MMD regs

On Tue, 2012-03-06 at 16:55 +0000, Ben Hutchings wrote:
> On Tue, 2012-03-06 at 09:28 +0100, Giuseppe CAVALLARO wrote:
> > This patch adds the initial support for the Energy-Efficient
> > Ethernet (EEE). It has been tested on IC+101G device on ST STB.
> > 
> > To support the EEE we have to access to the MMD registers 3.20 and
> > 3.60/61. So I added two new functions to read/write the MMD
> > registers (clause 45)
> > 
> > The upper-layer will invoke the phy_check_eee to properly check
> > if the EEE is supported by the PHYs.
> > 
> > Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@...com>
> > ---
> >  drivers/net/phy/phy_device.c |  136 ++++++++++++++++++++++++++++++++++++++++++
> >  include/linux/mdio.h         |    5 ++
> >  include/linux/mii.h          |   11 ++++
> >  include/linux/phy.h          |    3 +
> >  4 files changed, 155 insertions(+), 0 deletions(-)
> > 
> > diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
> > index f320f46..c269492e 100644
> > --- a/drivers/net/phy/phy_device.c
> > +++ b/drivers/net/phy/phy_device.c
> [...]
> > @@ -898,6 +899,141 @@ int genphy_resume(struct phy_device *phydev)
> >  }
> >  EXPORT_SYMBOL(genphy_resume);
> >  
> > +static inline void mmd_phy_cl45(struct mii_bus *bus, int prtad, int devad,
> > +				int addr)
> [...]
> > +/**
> > + * read_phy_mmd - reads data from the MMC register (clause 22 to access to
> > + * clause 45)
> [...]
> > +/**
> > + * write_phy_mmd - writes data to the MMC register (clause 22 to access to
> > + * clause 45)
> 
> These names need to be changed as phylib also supports (or is intended
> to support) real clause 45 PHYs.
> 
> [...]
> > diff --git a/include/linux/mdio.h b/include/linux/mdio.h
> > index dfb9479..a2dfe86 100644
> > --- a/include/linux/mdio.h
> > +++ b/include/linux/mdio.h
> > @@ -43,7 +43,11 @@
> >  #define MDIO_PKGID2		15
> >  #define MDIO_AN_ADVERTISE	16	/* AN advertising (base page) */
> >  #define MDIO_AN_LPA		19	/* AN LP abilities (base page) */
> > +#define MDIO_EEE_CAP		20	/* EEE Capability register */
> > +#define MDIO_EEE_WK_ERR		22	/* EEE wake error counter */
> >  #define MDIO_PHYXS_LNSTAT	24	/* PHY XGXS lane state */
> > +#define MDIO_EEE_ADV		60	/* EEE advertisement */
> > +#define MDIO_EEE_PART_LINK	61	/* EEE link partner ability */
> >  
> >  /* Media-dependent registers. */
> >  #define MDIO_PMA_10GBT_SWAPPOL	130	/* 10GBASE-T pair swap & polarity */
> 
> The convention I tried to set here was that register numbers defined for
> only one MMD are named beginning with MDIO_<mmd>_.  I also used 'LP' for
> link partner and 'ABLE' for capability/ability.
> 
> So for consistency I think those should be named MDIO_PCS_EEE_ABLE,
> MDIO_PCS_EEE_WK_ERR, MDIO_AN_EEE_ADV, MDIO_AN_EEE_LPABLE.
[...]

And note we already have MDIO_AN_EEE_ADV under 'Media-dependent
registers'.  I think that may be the wrong section so feel free to move
it up to 'Generic MDIO registers', but don't make two definitions.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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