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SubjectRe: [PATCH net-next v3 4/4] net: dp83869: Add RGMII internal delay configuration
> If the dt defines rgmii-rx/tx-id then these values are required not
> optional.  That was the discussion on the binding.

How many times do i need to say it. They are optional. If not
specified, default to 2ns.

> > > + ret = of_property_read_u32(of_node, "tx-internal-delay-ps",
> > > + &dp83869->tx_id_delay);
> > > + if (ret) {
> > > + dp83869->tx_id_delay = ret;
> > > + ret = 0;
> > > + }
> > > +
> > > return ret;
> > > }
> > > #else
> > > @@ -367,10 +388,45 @@ static int dp83869_configure_mode(struct phy_device *phydev,
> > > return ret;
> > > }
> > > +static int dp83869_get_delay(struct phy_device *phydev)
> > > +{
> > > + struct dp83869_private *dp83869 = phydev->priv;
> > > + int delay_size = ARRAY_SIZE(dp83869_internal_delay);
> > > + int tx_delay = 0;
> > > + int rx_delay = 0;
> > > +
> > > + if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID ||
> > > + phydev->interface == PHY_INTERFACE_MODE_RGMII_ID) {
> > > + tx_delay = phy_get_delay_index(phydev,
> > > + &dp83869_internal_delay[0],
> > > + delay_size, dp83869->tx_id_delay,
> > > + false);
> > > + if (tx_delay < 0) {
> > > + phydev_err(phydev, "Tx internal delay is invalid\n");
> > > + return tx_delay;
> > > + }
> > > + }
> > > +
> > > + if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID ||
> > > + phydev->interface == PHY_INTERFACE_MODE_RGMII_ID) {
> > > + rx_delay = phy_get_delay_index(phydev,
> > > + &dp83869_internal_delay[0],
> > > + delay_size, dp83869->rx_id_delay,
> > > + false);
> > > + if (rx_delay < 0) {
> > > + phydev_err(phydev, "Rx internal delay is invalid\n");
> > > + return rx_delay;
> > > + }
> > > + }
> > So any PHY using these properties is going to pretty much reproduce
> > this code. Meaning is should all be in a helper.
>
> The issue here is that the phy_mode may only be rgmii-txid so you only want
> to find the tx_delay and return.
>
> Same with the RXID.  How is the helper supposed to know what delay to return
> and look for?

How does this code do it? It looks at the value of interface.

Andrew

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