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SubjectRe: [PATCH net-next 4/6] net: dsa: mt7530: Add the support of MT7531 switch
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On Wed, 2019-12-11 at 00:48 +0800, Andrew Lunn wrote:
> > +static int mt7531_setup(struct dsa_switch *ds)
> > +{
> > + /* Enable PHY power, since phy_device has not yet been created
> > + * provided for phy_[read,write]_mmd_indirect is called, we provide
> > + * our own mt7531_ind_mmd_phy_[read,write] to complete this
> > + * function.
> > + */
> > + val = mt7531_ind_mmd_phy_read(priv, 0, PHY_DEV1F,
> > + MT7531_PHY_DEV1F_REG_403);
> > + val |= MT7531_PHY_EN_BYPASS_MODE;
> > + val &= ~MT7531_PHY_POWER_OFF;
> > + mt7531_ind_mmd_phy_write(priv, 0, PHY_DEV1F,
> > + MT7531_PHY_DEV1F_REG_403, val);
> > +
>
> Is this power to all the PHYs? Or just one?
This is an internal circuit that controls the power to all PHYs before
Generic MII registers are available.

Landen
>
> Andrew

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