netdev - RE: [PATCH net-next v8 6/9] net: txgbe: Support GPIO to SFP socket

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Message-ID: <016701d9886a$f9b415a0$ed1c40e0$@trustnetic.com>
Date: Wed, 17 May 2023 10:55:01 +0800
From: Jiawen Wu <jiawenwu@...stnetic.com>
To: "'Andy Shevchenko'" <andy.shevchenko@...il.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 v8 6/9] net: txgbe: Support GPIO to SFP socket

> > > > +   gc = devm_kzalloc(dev, sizeof(*gc), GFP_KERNEL);
> > > > +   if (!gc)
> > > > +           return -ENOMEM;
> > > > +
> > > > +   gc->label = devm_kasprintf(dev, GFP_KERNEL, "txgbe_gpio-%x",
> > > > +                              (wx->pdev->bus->number << 8) | wx->pdev->devfn);
> > > > +   gc->base = -1;
> > > > +   gc->ngpio = 6;
> > > > +   gc->owner = THIS_MODULE;
> > > > +   gc->parent = dev;
> > > > +   gc->fwnode = software_node_fwnode(txgbe->nodes.group[SWNODE_GPIO]);
> > >
> > > Looking at the I²C case, I'm wondering if gpio-regmap can be used for this piece.
> >
> > I can access this GPIO region directly, do I really need to use regmap?
> 
> It's not a matter of access, it's a matter of using an existing
> wrapper that will give you already a lot of code done there, i.o.w.
> you don't need to reinvent a wheel.

I took a look at the gpio-regmap code, when I call devm_gpio_regmap_register(),
I should provide gpio_regmap_config.irq_domain if I want to add the gpio_irq_chip.
But in this use, GPIO IRQs are requested by SFP driver. How can I get irq_domain
before SFP probe? And where do I add IRQ parent handler?