linux-kernel - Re: Re: [PATCH 1/5] MFD: twl6040: Add irq variable for slave devices

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Message-ID: <20110705121218.GD2820@legolas.emea.dhcp.ti.com>
Date:	Tue, 5 Jul 2011 15:12:19 +0300
From:	Felipe Balbi <balbi@...com>
To:	Péter Ujfalusi <peter.ujfalusi@...com>
Cc:	"Balbi, Felipe" <balbi@...com>, "Girdwood, Liam" <lrg@...com>,
	Tony Lindgren <tony@...mide.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"Lopez Cruz, Misael" <misael.lopez@...com>
Subject: Re: Re: [PATCH 1/5] MFD: twl6040: Add irq variable for slave devices

Hi,

On Tue, Jul 05, 2011 at 03:09:06PM +0300, Péter Ujfalusi wrote:
> On Tuesday 05 July 2011 13:22:46 Balbi, Felipe wrote:
> > Hi,
> > 
> > On Tue, Jul 05, 2011 at 12:14:22PM +0300, Peter Ujfalusi wrote:
> > > Add new variable to pass the irq number for the slaves
> > > devices of twl6040.
> > > The irq number configuration is done in the twl6040-core
> > > at probe time, so machine drivers do not need to be
> > > modified.
> > > 
> > > Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
> > > ---
> > > 
> > >  drivers/mfd/twl6040-core.c |    2 ++
> > >  include/linux/i2c/twl.h    |    2 ++
> > >  2 files changed, 4 insertions(+), 0 deletions(-)
> > > 
> > > diff --git a/drivers/mfd/twl6040-core.c b/drivers/mfd/twl6040-core.c
> > > index cfaedb5..8607793 100644
> > > --- a/drivers/mfd/twl6040-core.c
> > > +++ b/drivers/mfd/twl6040-core.c
> > > @@ -501,6 +501,7 @@ static int __devinit twl6040_probe(struct
> > > platform_device *pdev)
> > > 
> > >  	if (pdata->codec) {
> > >  	
> > >  		cell = &twl6040->cells[children];
> > >  		cell->name = "twl6040-codec";
> > > 
> > > +		pdata->codec->plug_irq = twl6040->irq_base + TWL6040_IRQ_PLUG;
> > 
> > are the slave devices platform_devices ?? If so, you could use struct
> > resource to pass IRQs as that's the "approved" way to do so. Then, on
> > child driver, you could either rely on a particular order of the
> > resources or assign them names and use platform_get_irq_byname() to
> > fetch the correct one (if you have more than one, that is).
> 
> You mean something like this:
> 
> static struct resource twl6040_codec_rsrc[] = {
> 	{
> 		.flags = IORESOURCE_IRQ,
> 	},
> };
> 
> ...
> 
> @@ -501,6 +501,7 @@ static int __devinit twl6040_probe(struct platform_device 
> *pdev)
> 		if (pdata->codec) {
> 			cell = &twl6040->cells[children];
> 			cell->name = "twl6040-codec";
> +			twl6040_codec_rsrc[0].start = twl6040->irq_base + TWL6040_IRQ_PLUG;
> +			twl6040_codec_rsrc[0].end = twl6040->irq_base + TWL6040_IRQ_PLUG;
> +			cell->resource = twl6040_codec_rsrc;
> +			cell->num_resources = ARRAY_SIZE(twl6040_codec_rsrc);
> 			cell->platform_data = pdata->codec;
> 			cell->pdata_size = sizeof(*pdata->codec);
> 			children++;
> 

yes, that's what I meant :-)

-- 
balbi

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