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>

diff --git a/drivers/mfd/stmpe.c b/drivers/mfd/stmpe.c
index f9d46f0..e2f9df1 100644 (file)
--- 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);