netdev - Re: [PATCH net-next v7 6/9] net: txgbe: Support GPIO to SFP socket

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Date: Fri, 12 May 2023 12:43:32 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Jiawen Wu <jiawenwu@...stnetic.com>
Cc: netdev@...r.kernel.org, jarkko.nikula@...ux.intel.com, 
	andriy.shevchenko@...ux.intel.com, mika.westerberg@...ux.intel.com, 
	jsd@...ihalf.com, Jose.Abreu@...opsys.com, andrew@...n.ch, 
	hkallweit1@...il.com, linux@...linux.org.uk, linux-i2c@...r.kernel.org, 
	linux-gpio@...r.kernel.org, mengyuanlou@...-swift.com
Subject: Re: [PATCH net-next v7 6/9] net: txgbe: Support GPIO to SFP socket

On Fri, May 12, 2023 at 11:58 AM Jiawen Wu <jiawenwu@...stnetic.com> wrote:

...

> > > +   switch (type) {
> > > +   case IRQ_TYPE_EDGE_BOTH:
> > > +           level |= BIT(hwirq);
> > > +           break;
> > > +   case IRQ_TYPE_EDGE_RISING:
> > > +           level |= BIT(hwirq);
> > > +           polarity |= BIT(hwirq);
> > > +           break;
> > > +   case IRQ_TYPE_EDGE_FALLING:
> > > +           level |= BIT(hwirq);
> >
> > > +           polarity &= ~BIT(hwirq);
> >
> > This...
> >
> > > +           break;
> > > +   case IRQ_TYPE_LEVEL_HIGH:
> > > +           level &= ~BIT(hwirq);
> >
> > ...and this can be done outside of the switch-case. Then you simply set certain
> > bits where it's needed.
> >
> > > +           polarity |= BIT(hwirq);
> > > +           break;
> > > +   case IRQ_TYPE_LEVEL_LOW:
> > > +           level &= ~BIT(hwirq);
> > > +           polarity &= ~BIT(hwirq);
> > > +           break;
> >
> > default?
>
> Do you mean that treat IRQ_TYPE_LEVEL_LOW as default case, clear level and
> polarity firstly, then set the bits in other needed case?

level &= ...
polarity &= ...

switch () {
case X:
  level |= ...
  break;
case Y:
  polarity |= ...
  break;
case Z:
  ...
  break;
default:
  ...handle error...
}


-- 
With Best Regards,
Andy Shevchenko