Re: Registering IRQ for MT7530 internal PHYs

[DENG Qingfang]

Hi Andrew,

On Wed, Dec 30, 2020 at 11:23 PM Andrew Lunn <andrew@xxxxxxx> wrote:
>
> On Wed, Dec 30, 2020 at 09:42:09AM +0000, Marc Zyngier wrote:
> > > +static irqreturn_t
> > > +mt7530_irq(int irq, void *data)
> > > +{
> > > +   struct mt7530_priv *priv = data;
> > > +   bool handled = false;
> > > +   int phy;
> > > +   u32 val;
> > > +
> > > +   val = mt7530_read(priv, MT7530_SYS_INT_STS);
> > > +   mt7530_write(priv, MT7530_SYS_INT_STS, val);
> >
> > If that is an ack operation, it should be dealt with as such in
> > an irqchip callback instead of being open-coded here.
>
> Hi Qingfang
>
> Does the PHY itself have interrupt control and status registers?

MT7531's internal PHY has an interrupt status register, but I don't
know if the same applies to MT7530.

>
> My experience with the Marvell Switch and its embedded PHYs is that
> the PHYs are just the same as the discrete PHYs. There are bits to
> enable different interrupts, and there are status bits indicating what
> event caused the interrupt. Clearing the interrupt in the PHY clears
> the interrupt in the switch interrupt controller. So in the mv88e6xxx
> interrupt code, you see i do a read of the switch interrupt controller
> status register, but i don't write to it as you have done.
>
>        Andrew