编译海思3520内核时候报错drivers/mfd/ezx-pcap.c:205:2: error: implicit declaration of function 'irq_to_gpio' [-

以下的解决的办法
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From: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Newsgroups: linux.kernel
Subject: [ 39/44] ARM: pxa: remove irq_to_gpio from ezx-pcap driver
Date: Tue, 14 Aug 2012 00:10:02 +0200
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From: Greg KH <gre...@linuxfoundation.org>

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Arnd Bergmann <a...@arndb.de>

commit 59ee93a528b94ef4e81a08db252b0326feff171f upstream.

The irq_to_gpio function was removed from the pxa platform
in linux-3.2, and this driver has been broken since.

There is actually no in-tree user of this driver that adds
this platform device, but the driver can and does get enabled
on some platforms.

Without this patch, building ezx_defconfig results in:

drivers/mfd/ezx-pcap.c: In function 'pcap_isr_work':
drivers/mfd/ezx-pcap.c:205:2: error: implicit declaration of function 'irq_to_gpio' [-Werror=implicit-function-declaration]

Signed-off-by: Arnd Bergmann <a...@arndb.de>
Acked-by: Haojian Zhuang <haojian.zhu...@gmail.com>
Cc: Samuel Ortiz <sa...@linux.intel.com>
Cc: Daniel Ribeiro <drw...@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
drivers/mfd/ezx-pcap.c       |    2 +-
include/linux/mfd/ezx-pcap.h |    1 +
2 files changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/mfd/ezx-pcap.c
+++ b/drivers/mfd/ezx-pcap.c
@@ -202,7 +202,7 @@ static void pcap_isr_work(struct work_st
}
local_irq_enable();
ezx_pcap_write(pcap, PCAP_REG_MSR, pcap->msr);
-	} while (gpio_get_value(irq_to_gpio(pcap->spi->irq)));
+	} while (gpio_get_value(pdata->gpio));
}

static void pcap_irq_handler(unsigned int irq, struct irq_desc *desc)
--- a/include/linux/mfd/ezx-pcap.h
+++ b/include/linux/mfd/ezx-pcap.h
@@ -16,6 +16,7 @@ struct pcap_subdev {
struct pcap_platform_data {
unsigned int irq_base;
unsigned int config;
+	int gpio;
void (*init) (void *);	/* board specific init */
int num_subdevs;
struct pcap_subdev *subdevs;

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