[PATCH v4 RESEND 1/3] Input: egalax_ts: get gpio from devicetree

Hui Wang jason77.wang at gmail.com
Thu Oct 11 05:23:11 EDT 2012

Shawn Guo wrote:
> Add LAKML ...
> On Wed, Oct 10, 2012 at 09:30:36AM -0700, Dmitry Torokhov wrote:
>> Hi Hui,
>> On Wed, Oct 10, 2012 at 05:12:01PM +0800, Hui Wang wrote:
>>> The irq_to_gpio() is old, most platforms use GENERIC_GPIO framework
>>> and don't support this API anymore.
>>> The i.MX6q sabrelite platform equips an egalax touchscreen controller,
>>> and this platform already transfered to GENERIC_GPIO framework, to
>>> support this driver, we use a more generic way to get gpio.
>> Unfortunately this does break the driver for platforms that do still
>> support irq_to_gpio and have not transitioned to device tree (yet?).
>> It looks like the API suffered from premature deletion...
>> I really do not want to add a new platform data structure with only gpio
>> in it, is there a better way to detect if irq_to_gpio() (even if only a
>> stub) is available?
> If CONFIG_ARCH_HAVE_CUSTOM_GPIO_H is not enabled for an architecture,
> the irq_to_gpio() in include/linux/gpio.h will tell unavailability by
> returning -EINVAL.  But ARM
So far, the only way i can figure out is to add following in the 

static inline int arm_irq_to_gpio(unsigned int irq)
return -EINVAL;

#ifndef irq_to_gpio
#define irq_to_gpio arm_irq_to_gpio

And remove all irq_to_gpio() function definitions in the arch/arm/, if 
mach want a specific irq_to_gpio, they can use macro to define their own.


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