gpio/mxc: add .to_irq for gpio chip

It adds .to_irq support for gpio chip, so that __gpio_to_irq in
gpiolib becomes usable.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c
index 4340acae3bd3..64aff20bc620 100644
--- a/drivers/gpio/gpio-mxc.c
+++ b/drivers/gpio/gpio-mxc.c
@@ -337,6 +337,15 @@ static void __devinit mxc_gpio_get_hw(struct platform_device *pdev)
         mxc_gpio_hwtype = hwtype;
 }
 
+static int mxc_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+        struct bgpio_chip *bgc = to_bgpio_chip(gc);
+        struct mxc_gpio_port *port =
+                container_of(bgc, struct mxc_gpio_port, bgc);
+
+        return port->virtual_irq_start + offset;
+}
+
 static int __devinit mxc_gpio_probe(struct platform_device *pdev)
 {
         struct device_node *np = pdev->dev.of_node;
@@ -403,6 +412,7 @@ static int __devinit mxc_gpio_probe(struct platform_device *pdev)
         if (err)
                 goto out_iounmap;
 
+        port->bgc.gc.to_irq = mxc_gpio_to_irq;
         port->bgc.gc.base = pdev->id * 32;
         port->bgc.dir = port->bgc.read_reg(port->bgc.reg_dir);
         port->bgc.data = port->bgc.read_reg(port->bgc.reg_set);