gpio/lpc32xx: Add device tree support
This patch adds device tree support for gpio-lpc32xx.c.
To register the various GPIO banks as (struct) gpio_chips via the same DT
gpio-controller, we utilize the adjusted of_xlate API to manipulate the
actually used struct gpio_chip.
Signed-off-by: Roland Stigge <stigge@antcom.de>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/drivers/gpio/gpio-lpc32xx.c b/drivers/gpio/gpio-lpc32xx.c
index 61c2d08..c2199be 100644
--- a/drivers/gpio/gpio-lpc32xx.c
+++ b/drivers/gpio/gpio-lpc32xx.c
@@ -21,6 +21,9 @@
#include <linux/io.h>
#include <linux/errno.h>
#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
#include <mach/hardware.h>
#include <mach/platform.h>
@@ -454,10 +457,57 @@
},
};
+/* Empty now, can be removed later when mach-lpc32xx is finally switched over
+ * to DT support
+ */
void __init lpc32xx_gpio_init(void)
{
+}
+
+static int lpc32xx_of_xlate(struct gpio_chip *gc,
+ const struct of_phandle_args *gpiospec, u32 *flags)
+{
+ /* Is this the correct bank? */
+ u32 bank = gpiospec->args[0];
+ if ((bank > ARRAY_SIZE(lpc32xx_gpiochip) ||
+ (gc != &lpc32xx_gpiochip[bank].chip)))
+ return -EINVAL;
+
+ if (flags)
+ *flags = gpiospec->args[2];
+ return gpiospec->args[1];
+}
+
+static int __devinit lpc32xx_gpio_probe(struct platform_device *pdev)
+{
int i;
- for (i = 0; i < ARRAY_SIZE(lpc32xx_gpiochip); i++)
+ for (i = 0; i < ARRAY_SIZE(lpc32xx_gpiochip); i++) {
+ if (pdev->dev.of_node) {
+ lpc32xx_gpiochip[i].chip.of_xlate = lpc32xx_of_xlate;
+ lpc32xx_gpiochip[i].chip.of_gpio_n_cells = 3;
+ lpc32xx_gpiochip[i].chip.of_node = pdev->dev.of_node;
+ }
gpiochip_add(&lpc32xx_gpiochip[i].chip);
+ }
+
+ return 0;
}
+
+#ifdef CONFIG_OF
+static struct of_device_id lpc32xx_gpio_of_match[] __devinitdata = {
+ { .compatible = "nxp,lpc3220-gpio", },
+ { },
+};
+#endif
+
+static struct platform_driver lpc32xx_gpio_driver = {
+ .driver = {
+ .name = "lpc32xx-gpio",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(lpc32xx_gpio_of_match),
+ },
+ .probe = lpc32xx_gpio_probe,
+};
+
+module_platform_driver(lpc32xx_gpio_driver);
