Exynos4 GPIO helper functions registers each bank of GPIO as a gpio chip. For each gpio chip being registered, this patch finds a matching node in device tree and attaches the node pointer to the gpio chip. The match is based on the compatible property of the node.
Signed-off-by: Thomas Abraham <[email protected]> --- Each gpio controller is listed as below in the dts file. gpa0: gpio-controller@11400000 { compatible = "samsung,exynos4-gpio-gpa0","samsung,exynos4-gpio"; #gpio-cells = <2>; gpio-controller; }; gpa1: gpio-controller@11400020 { compatible = "samsung,exynos4-gpio-gpa1","samsung,exynos4-gpio"; #gpio-cells = <2>; gpio-controller; }; gpb: gpio-controller@11400040 { compatible = "samsung,exynos4-gpio-gpb","samsung,exynos4-gpio"; #gpio-cells = <2>; gpio-controller; }; and many more (gpc, gpd, ...., gpx) For each linux domain gpio chip registered by the exynos4 gpio helpers, a matching device node is found from the device tree by matching the compatible property. drivers/gpio/gpio-exynos4.c | 30 ++++++++++++++++++++++++++++++ 1 files changed, 30 insertions(+), 0 deletions(-) diff --git a/drivers/gpio/gpio-exynos4.c b/drivers/gpio/gpio-exynos4.c index 9029835..c727bf1 100644 --- a/drivers/gpio/gpio-exynos4.c +++ b/drivers/gpio/gpio-exynos4.c @@ -14,6 +14,10 @@ #include <linux/irq.h> #include <linux/io.h> #include <linux/gpio.h> +#ifdef CONFIG_OF +#include <linux/of.h> +#include <linux/slab.h> +#endif #include <mach/map.h> @@ -321,6 +325,29 @@ static struct s3c_gpio_chip exynos4_gpio_part3_4bit[] = { }, }; +#ifdef CONFIG_OF +static __init void exynos4_gpiolib_attach_ofnode(struct gpio_chip *gc) +{ + const char exynos4_gpio_compat_base[] = "samsung,exynos4-gpio-"; + char *exynos4_gpio_compat; + + exynos4_gpio_compat = kzalloc(strlen(exynos4_gpio_compat_base) + + strlen(gc->label), GFP_KERNEL); + if (!exynos4_gpio_compat) + return; + + strcpy(exynos4_gpio_compat, exynos4_gpio_compat_base); + strcat(exynos4_gpio_compat, gc->label); + gc->of_node = of_find_compatible_node(NULL, NULL, exynos4_gpio_compat); + kfree(exynos4_gpio_compat); +} +#else +static __init void exynos4_gpiolib_attach_ofnode(struct gpio_chip *chip) +{ + return; +} +#endif + static __init int exynos4_gpiolib_init(void) { struct s3c_gpio_chip *chip; @@ -341,6 +368,7 @@ static __init int exynos4_gpiolib_init(void) } if (chip->base == NULL) chip->base = S5P_VA_GPIO1 + (i) * 0x20; + exynos4_gpiolib_attach_ofnode(&chip->chip); } samsung_gpiolib_add_4bit_chips(exynos4_gpio_part1_4bit, nr_chips); @@ -358,6 +386,7 @@ static __init int exynos4_gpiolib_init(void) } if (chip->base == NULL) chip->base = S5P_VA_GPIO2 + (i) * 0x20; + exynos4_gpiolib_attach_ofnode(&chip->chip); } samsung_gpiolib_add_4bit_chips(exynos4_gpio_part2_4bit, nr_chips); @@ -375,6 +404,7 @@ static __init int exynos4_gpiolib_init(void) } if (chip->base == NULL) chip->base = S5P_VA_GPIO3 + (i) * 0x20; + exynos4_gpiolib_attach_ofnode(&chip->chip); } samsung_gpiolib_add_4bit_chips(exynos4_gpio_part3_4bit, nr_chips); -- 1.6.6.rc2 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
