linux-kernel - Re: [PATCH] mfd: da9052-core: Fix request_threaded

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Message-Id: <201209271434.45516.arnd@arndb.de>
Date:	Thu, 27 Sep 2012 14:34:45 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Fabio Estevam <festevam@...il.com>, sameo@...ux.intel.com,
	marex@...x.de, ashish.jangam@...tcummins.com, dchen@...semi.com,
	linux-kernel@...r.kernel.org,
	Fabio Estevam <fabio.estevam@...escale.com>
Subject: Re: [PATCH] mfd: da9052-core: Fix request_threaded_irq() parameter

On Thursday 27 September 2012, Mark Brown wrote:
> On Thu, Sep 27, 2012 at 12:55:35AM -0300, Fabio Estevam wrote:
> > From: Fabio Estevam <fabio.estevam@...escale.com>
> > 
> > On a mx53qsb dt-kernel the da9052-core driver fails to probe:
> > 
> > da9052 1-0048: DA9052 ADC IRQ failed ret=-22
> > 
> > In request_threaded_irq() the first parameter is missing the da9052->irq_base.
> > 
> > Fix it and avoid the error.
> 
> The driver shouldn't be relying on irq_base at all, it should use
> regmap_get_virq() to look up the interrupt number.  If it relies on
> irq_base then the user is forced to assign one (or rely on automatic
> assignment, which is a bit erratic.  Otherwise it can use a linear
> domain which doesn't rely on being able to allocate a big block of
> interrupt numbers.

For all I can tell, the driver implements the automatic assignment
correctly, but I was also going to ask for removing the da9052->irq_base
variable and using the linear domain instead.

We don't have any platforms actually setting the irq_base in the
mainline kernel (I assume some of out tree platforms do this), but there
are a few drivers that need to be adapted to use regmap_irq_get_virq
or irq_to_desc(irq)->hw_irq, respectively:

drivers/gpio/gpio-da9052.c:     return da9052->irq_base + DA9052_IRQ_GPI0 + offset;
drivers/input/touchscreen/da9052_tsi.c: tsi->irq_pendwn = da9052->irq_base + irq_pendwn;
drivers/input/touchscreen/da9052_tsi.c: tsi->irq_datardy = da9052->irq_base + irq_datardy;
drivers/power/da9052-battery.c: irq -= bat->da9052->irq_base;
drivers/power/da9052-battery.c:         ret = request_threaded_irq(bat->da9052->irq_base + irq,
drivers/power/da9052-battery.c:         free_irq(bat->da9052->irq_base + irq, bat);
drivers/power/da9052-battery.c:         free_irq(bat->da9052->irq_base + irq, bat);

	Arnd
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