mfd: stmpe: Support gpio over irq under device tree

The stmpe_platform_data has a irq_over_gpio field, which allows the
system to read STMPE events whenever an IRQ occurs on a GPIO pin.
This patch adds the ability to configure this field and to use a GPIO
as an IRQ source for boards configuring the STMPE in device tree.

Signed-off-by: Sean Cross <xobs@kosagi.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/mfd/stmpe.c b/drivers/mfd/stmpe.c
index f9d46f035bb1..e2f9df1c0c36 100644
--- a/drivers/mfd/stmpe.c
+++ b/drivers/mfd/stmpe.c
@@ -1122,7 +1122,12 @@ static void stmpe_of_probe(struct stmpe_platform_data *pdata,
         if (pdata->id < 0)
                 pdata->id = -1;
 
-        pdata->irq_trigger = IRQF_TRIGGER_NONE;
+        pdata->irq_gpio = of_get_named_gpio_flags(np, "irq-gpio", 0,
+                                &pdata->irq_trigger);
+        if (gpio_is_valid(pdata->irq_gpio))
+                pdata->irq_over_gpio = 1;
+        else
+                pdata->irq_trigger = IRQF_TRIGGER_NONE;
 
         of_property_read_u32(np, "st,autosleep-timeout",
                         &pdata->autosleep_timeout);