[PATCH] powerpc/5121: pdm360ng: fix touch irq if 8xxx gpio driver is enabled

[Anatolij Gustschin]

Enabling the MPC8xxx GPIO driver with MPC512x GPIO extension
breaks touch screen support on this board since the GPIO
interrupt will be mapped to 8xxx GPIO irq host resulting in
a not requestable interrupt in the touch screen driver. Fix
it by mapping the touch interrupt on 8xxx GPIO irq host.
Signed-off-by: Anatolij Gustschin <ag...@denx.de>
---
 arch/powerpc/platforms/512x/pdm360ng.c |   26 ++++++++++++++++++++++----
 1 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/platforms/512x/pdm360ng.c 
b/arch/powerpc/platforms/512x/pdm360ng.c
index 0575e85..558eb9e 100644
--- a/arch/powerpc/platforms/512x/pdm360ng.c
+++ b/arch/powerpc/platforms/512x/pdm360ng.c
@@ -27,6 +27,7 @@
 #include <linux/spi/ads7846.h>
 #include <linux/spi/spi.h>
 #include <linux/notifier.h>
+#include <asm/gpio.h>
 
 static void *pdm360ng_gpio_base;
 
@@ -50,7 +51,7 @@ static struct ads7846_platform_data pdm360ng_ads7846_pdata = {
        .irq_flags              = IRQF_TRIGGER_LOW,
 };
 
-static int __init pdm360ng_penirq_init(void)
+static int pdm360ng_penirq_init(void)
 {
        struct device_node *np;
 
@@ -73,6 +74,9 @@ static int __init pdm360ng_penirq_init(void)
        return 0;
 }
 
+#define GPIO_NR(x)     (ARCH_NR_GPIOS - 32 + (x))
+#define PENDOWN_GPIO   GPIO_NR(25)
+
 static int pdm360ng_touchscreen_notifier_call(struct notifier_block *nb,
                                        unsigned long event, void *__dev)
 {
@@ -80,7 +84,24 @@ static int pdm360ng_touchscreen_notifier_call(struct 
notifier_block *nb,
 
        if ((event == BUS_NOTIFY_ADD_DEVICE) &&
            of_device_is_compatible(dev->of_node, "ti,ads7846")) {
+               struct spi_device *spi = to_spi_device(dev);
+               int gpio = PENDOWN_GPIO;
+
                dev->platform_data = &pdm360ng_ads7846_pdata;
+               if (pdm360ng_penirq_init())
+                       return NOTIFY_DONE;
+
+               if (gpio_request_one(gpio, GPIOF_IN, "ads7845_pen_down") < 0) {
+                       pr_err("Failed to request GPIO %d for "
+                               "ads7845 pen down IRQ\n", gpio);
+                       return NOTIFY_DONE;
+               }
+               spi->irq = gpio_to_irq(gpio);
+               if (spi->irq < 0) {
+                       pr_err("Can't map GPIO IRQ\n");
+                       gpio_free(gpio);
+                       return NOTIFY_DONE;
+               }
                return NOTIFY_OK;
        }
        return NOTIFY_DONE;
@@ -92,9 +113,6 @@ static struct notifier_block pdm360ng_touchscreen_nb = {
 
 static void __init pdm360ng_touchscreen_init(void)
 {
-       if (pdm360ng_penirq_init())
-               return;
-
        bus_register_notifier(&spi_bus_type, &pdm360ng_touchscreen_nb);
 }
 #else
-- 
1.7.0.4

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