[PATCH v1 1/6] net: mv88e61xx: Add support for checking addressing mode

[Lukasz Majewski]

Hi Joe, Tom,

> On Wed, Mar 17, 2021 at 4:14 PM Lukasz Majewski <lukma at denx.de> wrote:
> >
> > Some Marvell switch devices are dual chip ones, like mv88e6020,
> > which use direct MDIO addressing to access its ports' registers.
> > Such approach allows connecting two such devices in a single MDIO
> > bus with simple addressing scheme.
> >
> > Signed-off-by: Lukasz Majewski <lukma at denx.de>
> > ---
> >
> >  drivers/net/phy/mv88e61xx.c | 42
> > +++++++++++++++++++++++++++++++++++++ 1 file changed, 42
> > insertions(+)
> >
> > diff --git a/drivers/net/phy/mv88e61xx.c
> > b/drivers/net/phy/mv88e61xx.c index 7eff37b24499..69a1dd8f1859
> > 100644 --- a/drivers/net/phy/mv88e61xx.c
> > +++ b/drivers/net/phy/mv88e61xx.c
> > @@ -202,6 +202,7 @@ struct mv88e61xx_phy_priv {
> >         u8 phy_ctrl1_en_det_shift; /* 'EDet' bit field offset */
> >         u8 phy_ctrl1_en_det_width; /* Width of 'EDet' bit field */
> >         u8 phy_ctrl1_en_det_ctrl;  /* 'EDet' control value */
> > +       u8 direct_access;          /* Access switch device directly
> > */ };
> >
> >  static inline int smi_cmd(int cmd, int addr, int reg)
> > @@ -928,6 +929,40 @@ static int
> > mv88e61xx_priv_reg_offs_pre_init(struct phy_device *phydev) return
> > -ENODEV; }
> >
> > +static int mv88e61xx_check_addressing(struct phy_device *phydev)
> > +{
> > +       if (!CONFIG_IS_ENABLED(OF_CONTROL))
> > +               return 0;
> > +
> > +       /*
> > +        * Some devices - like mv88e6020 are dual chip - i.e. two
> > +        * such devices can be directly accessed via SMI bus.
> > +        * The addressing depends on R0_LED/ADDR4 pin value duing
> > +        * bootstrap.
> > +        *
> > +        * This means that there is no need for indirect access.
> > +        */
> > +       struct mv88e61xx_phy_priv *priv = phydev->priv;
> > +
> > +       /*
> > +        * As this function is called very early and hence the
> > phydev
> > +        * is not yet initialized we use aliast and DTS to asses if
> > +        * device shall be directly accessed or not.
> > +        */
> > +       ofnode sw0;
> > +       int ret;
> > +
> > +       sw0 = ofnode_get_aliases_node("switch0");
> > +       if (!ofnode_valid(sw0))
> > +               return -ENODEV;
> > +
> > +       ret = ofnode_device_is_compatible(sw0, "marvell,mv88e6020");
> > +       if (ret)
> > +               priv->direct_access = 1;
> > +
> > +       return 0;
> > +}
> > +
> >  static int mv88e61xx_probe(struct phy_device *phydev)
> >  {
> >         struct mii_dev *smi_wrapper;
> > @@ -982,6 +1017,8 @@ static int mv88e61xx_probe(struct phy_device
> > *phydev)
> >
> >         phydev->priv = priv;
> >
> > +       mv88e61xx_check_addressing(phydev);
> > +
> >         res = mv88e61xx_priv_reg_offs_pre_init(phydev);
> >         if (res < 0)
> >                 return res;
> > @@ -1197,6 +1234,11 @@ int get_phy_id(struct mii_dev *bus, int
> > smi_addr, int devad, u32 *phy_id) temp_phy.priv = &temp_priv;
> >         temp_mii.priv = &temp_phy;
> >
> > +       mv88e61xx_check_addressing(&temp_phy);
> > +       /* For direct access the phy address equals to smi_addr */
> > +       if (temp_priv.direct_access)
> > +               temp_phy.addr = smi_addr;
> > +
> >         /*
> >          * get_phy_id() can be called by framework before mv88e61xx
> > driver
> >          * probing, in this case the global register offsets are not
> > --
> > 2.20.1
> >  
> 
> Reviewed-by: Ramon Fried <rfried.dev at gmail.com>

Could this patch series be pulled to u-boot-net tree (or directly to
-master branch) ?

Best regards,

Lukasz Majewski

--

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