gpio: stmpe: Add DT support for stmpe gpio

This patch allows the STMPE GPIO driver to be successfully probed and
initialised when Device Tree support is enabled. Bindings are mentioned in
Documentation too.

Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Vipul Kumar Samar <vipulkumar.samar@st.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/gpio/gpio-stmpe.c b/drivers/gpio/gpio-stmpe.c
index dce34727bbf8..522c90ee96e8 100644
--- a/drivers/gpio/gpio-stmpe.c
+++ b/drivers/gpio/gpio-stmpe.c
@@ -12,6 +12,7 @@
 #include <linux/gpio.h>
 #include <linux/irq.h>
 #include <linux/interrupt.h>
+#include <linux/of.h>
 #include <linux/mfd/stmpe.h>
 
 /*
@@ -304,6 +305,7 @@ static void stmpe_gpio_irq_remove(struct stmpe_gpio *stmpe_gpio)
 static int __devinit stmpe_gpio_probe(struct platform_device *pdev)
 {
         struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
+        struct device_node *np = pdev->dev.of_node;
         struct stmpe_gpio_platform_data *pdata;
         struct stmpe_gpio *stmpe_gpio;
         int ret;
@@ -321,13 +323,17 @@ static int __devinit stmpe_gpio_probe(struct platform_device *pdev)
 
         stmpe_gpio->dev = &pdev->dev;
         stmpe_gpio->stmpe = stmpe;
-        stmpe_gpio->norequest_mask = pdata ? pdata->norequest_mask : 0;
-
         stmpe_gpio->chip = template_chip;
         stmpe_gpio->chip.ngpio = stmpe->num_gpios;
         stmpe_gpio->chip.dev = &pdev->dev;
         stmpe_gpio->chip.base = pdata ? pdata->gpio_base : -1;
 
+        if (pdata)
+                stmpe_gpio->norequest_mask = pdata->norequest_mask;
+        else if (np)
+                of_property_read_u32(np, "st,norequest-mask",
+                                &stmpe_gpio->norequest_mask);
+
         if (irq >= 0)
                 stmpe_gpio->irq_base = stmpe->irq_base + STMPE_INT_GPIO(0);
         else