linux-kernel - Re: [PATCH 2/2][resend] gpio: pcf857x: enable gpio_to

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Date:	Thu, 14 Jun 2012 00:06:14 -0700 (PDT)
From:	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:	Paul Mundt <lethal@...ux-sh.org>
Cc:	Linus Walleij <linus.walleij@...ricsson.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Kuninori Morimoto <kuninori.morimoto.gx@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2][resend] gpio: pcf857x: enable gpio_to_irq() support


Hi Paul

Thank you for checking patch

> > +static struct irq_chip pcf857x_irq_chip = {
> > +	.name		= "pcf857x cascade",
> > +	.irq_mask	= pcf857x_nothing,
> > +	.irq_unmask	= pcf857x_nothing,
> > +};
> > +
> Just use dummy_irq_chip.

Thanks. I didn't know that.
OK. I fix it in v2

> > +static int pcf857x_irq_domain_init(struct pcf857x *gpio,
> > +				   struct pcf857x_platform_data *pdata,
> > +				   struct device *dev)
> > +{
> > +	int status;
> > +
> > +	/* create demuxed irq */
> > +	gpio->irq_demux_base = irq_alloc_descs(-1, 0, gpio->chip.ngpio, 0);
> > +	if (gpio->irq_demux_base < 0)
> > +		return -ENODEV;
> > +
> > +	gpio->irq_domain = irq_domain_add_legacy(dev->of_node,
> > +						 gpio->chip.ngpio,
> > +						 gpio->irq_demux_base,
> > +						 0,
> > +						 &pcf857x_irq_domain_ops,
> > +						 NULL);
> 
> Given that you don't actually care where the IRQs are mapped there's no
> need to bother with a legacy domain here, you can just use a linear one
> outright. At which point you can drop your separate irq_desc
> allocation/management.

OK. I use linear in v2

Best regards
---
Kuninori Morimoto
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