diff options
author | Roland Stigge <stigge@antcom.de> | 2012-05-18 10:19:52 +0200 |
---|---|---|
committer | Grant Likely <grant.likely@secretlab.ca> | 2012-05-18 16:48:36 -0600 |
commit | e92935e13a052df7e6bc274e00fc91b80531f1e4 (patch) | |
tree | b04f80aa90bab2d71f2299b00f5cccc3e7ee9a7a /drivers/gpio/gpio-lpc32xx.c | |
parent | 3d0f7cf0f3633f92ddeb767eb59cab73963d4dee (diff) | |
download | linux-e92935e13a052df7e6bc274e00fc91b80531f1e4.tar.bz2 |
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>
Diffstat (limited to 'drivers/gpio/gpio-lpc32xx.c')
-rw-r--r-- | drivers/gpio/gpio-lpc32xx.c | 52 |
1 files changed, 51 insertions, 1 deletions
diff --git a/drivers/gpio/gpio-lpc32xx.c b/drivers/gpio/gpio-lpc32xx.c index 61c2d08d37b6..c2199beca98a 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 @@ 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); |