xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

gpio/lpc32xx: Add device tree support

Browse Source 
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>
This commit is contained in:
Roland Stigge
2012-05-18 10:19:52 +02:00
committed by Grant Likely
parent 3d0f7cf0f3
commit e92935e13a
3 changed files with 102 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

52
drivers/gpio/gpio-lpc32xx.c
View File

@@ -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 @@ static struct lpc32xx_gpio_chip lpc32xx_gpiochip[] = {
},
};
/* 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);