[U-Boot] [PATCH v2] net: phy: marvell: Add functions to read PHY's extended registers

[Lukasz Majewski <lukma@denx.de>]

Hi York,

> On 10/27/2017 08:23 AM, Lukasz Majewski wrote:
> > On Fri, 27 Oct 2017 15:06:37 +0000
> > York Sun <york.sun@nxp.com> wrote:
> >   
> >> On 10/27/2017 02:12 AM, Lukasz Majewski wrote:  
> >>> This commit allows extended Marvell registers to be read with:
> >>>
> >>> foo > mdio rx FEC 3.10
> >>> Reading from bus FEC
> >>> PHY at address 0:
> >>> 3.16 - 0x1063
> >>> foo > mdio wx FEC 3.10 0x1011
> >>>
> >>> The above code changes the way ETH connector LEDs blink.
> >>>
> >>> Signed-off-by: Lukasz Majewski <lukma@denx.de>
> >>>
> >>> ---
> >>>
> >>> Changes in v2:
> >>> - Provide the readext and writeext callbacks to other marvell ETH
> >>> PHY devices
> >>>
> >>>  drivers/net/phy/marvell.c | 47
> >>> +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47
> >>> insertions(+)
> >>>
> >>> diff --git a/drivers/net/phy/marvell.c b/drivers/net/phy/marvell.c
> >>> index b7f300e..19f451d 100644
> >>> --- a/drivers/net/phy/marvell.c
> >>> +++ b/drivers/net/phy/marvell.c
> >>> @@ -104,6 +104,31 @@
> >>>  #define MIIM_88E151x_MODE_SGMII		1
> >>>  #define MIIM_88E151x_RESET_OFFS		15
> >>>  
> >>> +static int m88e1xxx_phy_extread(struct phy_device *phydev, int
> >>> addr,
> >>> +				int devaddr, int regnum)
> >>> +{
> >>> +	int oldpage = phy_read(phydev, MDIO_DEVAD_NONE,
> >>> MII_MARVELL_PHY_PAGE);
> >>> +	int val;
> >>> +
> >>> +	phy_write(phydev, MDIO_DEVAD_NONE, MII_MARVELL_PHY_PAGE,
> >>> devaddr);  
> 
> For register 30 and 31, the page register is 29, not 22.

Yes, for 88E1145 and 88E1149 the page register is 29, not 22 (as it is
in majority of devices from marvell.c file in u-boot).

It seems like the most practical approach would be as presented in
patch v1 - just enable this code on PHY which I can test.

If you find other devices (boards) and test the code, then we can add
it as well.
 
> >>> +	val = phy_read(phydev, MDIO_DEVAD_NONE, regnum);
> >>> +	phy_write(phydev, MDIO_DEVAD_NONE, MII_MARVELL_PHY_PAGE,
> >>> oldpage); +
> >>> +	return val;
> >>> +}
> >>> +
> >>> +static int m88e1xxx_phy_extwrite(struct phy_device *phydev, int
> >>> addr,
> >>> +				 int devaddr, int regnum, u16
> >>> val) +{
> >>> +	int oldpage = phy_read(phydev, MDIO_DEVAD_NONE,
> >>> MII_MARVELL_PHY_PAGE); +
> >>> +	phy_write(phydev, MDIO_DEVAD_NONE, MII_MARVELL_PHY_PAGE,
> >>> devaddr);
> >>> +	phy_write(phydev, MDIO_DEVAD_NONE, regnum, val);
> >>> +	phy_write(phydev, MDIO_DEVAD_NONE, MII_MARVELL_PHY_PAGE,
> >>> oldpage); +
> >>> +	return 0;
> >>> +}
> >>> +
> >>>  /* Marvell 88E1011S */
> >>>  static int m88e1011s_config(struct phy_device *phydev)
> >>>  {
> >>> @@ -599,6 +624,8 @@ static struct phy_driver M88E1011S_driver = {
> >>>  	.config = &m88e1011s_config,
> >>>  	.startup = &m88e1011s_startup,
> >>>  	.shutdown = &genphy_shutdown,
> >>> +	.readext = &m88e1xxx_phy_extread,
> >>> +	.writeext = &m88e1xxx_phy_extwrite,
> >>>  };
> >>>    
> >>
> >> Lukasz,
> >>
> >> This seems wrong. 88E1011S doesn't have the page register.  
> > 
> > Ok. I will remove this one from v3.
> >   
> >> I can only
> >> confirm 88E1111 and 88E1145 have pages.   
> > 
> > I do know that it works on 88E151x
> > 
> > The 88E1318 and 88E1618 seems to be unknown.
> >   
> >> I don't have other part's
> >> datasheet to check.  
> >   
> 
> I suggest only to enable the parts you can confirm on hardware,
> datasheet, or from the source code (where the page register is used).
> 
> York



Best regards,

Lukasz Majewski

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