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gpio/samsung: Add device tree support for EXYNOS4

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As gpio chips get registered, a device tree node which represents the
gpio chip is searched and attached to it. A translate function is also
provided to convert the gpio specifier into actual platform settings
for pin function selection, pull up/down and driver strength settings.

Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
[kgene.kim@samsung.com: fixed build error]
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
This commit is contained in:
Thomas Abraham
2011-11-07 01:02:21 +05:30
committed by Kukjin Kim
parent f983575aa9
commit 659d73ada5
2 changed files with 112 additions and 0 deletions
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72
drivers/gpio/gpio-samsung.c
View File

@@ -24,6 +24,9 @@
#include <linux/interrupt.h>
#include <linux/sysdev.h>
#include <linux/ioport.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <linux/of_address.h>
#include <asm/irq.h>
@@ -2374,6 +2377,63 @@ static struct samsung_gpio_chip exynos4_gpios_3[] = {
#endif
};
#if defined(CONFIG_ARCH_EXYNOS4) && defined(CONFIG_OF)
static int exynos4_gpio_xlate(struct gpio_chip *gc, struct device_node *np,
const void *gpio_spec, u32 *flags)
{
const __be32 *gpio = gpio_spec;
const u32 n = be32_to_cpup(gpio);
unsigned int pin = gc->base + be32_to_cpu(gpio[0]);
if (WARN_ON(gc->of_gpio_n_cells < 4))
return -EINVAL;
if (n > gc->ngpio)
return -EINVAL;
if (s3c_gpio_cfgpin(pin, S3C_GPIO_SFN(be32_to_cpu(gpio[1]))))
pr_warn("gpio_xlate: failed to set pin function\n");
if (s3c_gpio_setpull(pin, be32_to_cpu(gpio[2])))
pr_warn("gpio_xlate: failed to set pin pull up/down\n");
if (s5p_gpio_set_drvstr(pin, be32_to_cpu(gpio[3])))
pr_warn("gpio_xlate: failed to set pin drive strength\n");
return n;
}
static const struct of_device_id exynos4_gpio_dt_match[] __initdata = {
{ .compatible = "samsung,exynos4-gpio", },
{}
};
static __init void exynos4_gpiolib_attach_ofnode(struct samsung_gpio_chip *chip,
u64 base, u64 offset)
{
struct gpio_chip *gc = &chip->chip;
u64 address;
if (!of_have_populated_dt())
return;
address = chip->base ? base + ((u32)chip->base & 0xfff) : base + offset;
gc->of_node = of_find_matching_node_by_address(NULL,
exynos4_gpio_dt_match, address);
if (!gc->of_node) {
pr_info("gpio: device tree node not found for gpio controller"
" with base address %08llx\n", address);
return;
}
gc->of_gpio_n_cells = 4;
gc->of_xlate = exynos4_gpio_xlate;
}
#elif defined(CONFIG_ARCH_EXYNOS4)
static __init void exynos4_gpiolib_attach_ofnode(struct samsung_gpio_chip *chip,
u64 base, u64 offset)
{
return;
}
#endif /* defined(CONFIG_ARCH_EXYNOS4) && defined(CONFIG_OF) */
/* TODO: cleanup soc_is_* */
static __init int samsung_gpiolib_init(void)
{
@@ -2455,6 +2515,10 @@ static __init int samsung_gpiolib_init(void)
chip->config = &exynos4_gpio_cfg;
chip->group = group++;
}
#ifdef CONFIG_CPU_EXYNOS4210
exynos4_gpiolib_attach_ofnode(chip,
EXYNOS4_PA_GPIO1, i * 0x20);
#endif
}
samsung_gpiolib_add_4bit_chips(exynos4_gpios_1, nr_chips, S5P_VA_GPIO1);
@@ -2467,6 +2531,10 @@ static __init int samsung_gpiolib_init(void)
chip->config = &exynos4_gpio_cfg;
chip->group = group++;
}
#ifdef CONFIG_CPU_EXYNOS4210
exynos4_gpiolib_attach_ofnode(chip,
EXYNOS4_PA_GPIO2, i * 0x20);
#endif
}
samsung_gpiolib_add_4bit_chips(exynos4_gpios_2, nr_chips, S5P_VA_GPIO2);
@@ -2479,6 +2547,10 @@ static __init int samsung_gpiolib_init(void)
chip->config = &exynos4_gpio_cfg;
chip->group = group++;
}
#ifdef CONFIG_CPU_EXYNOS4210
exynos4_gpiolib_attach_ofnode(chip,
EXYNOS4_PA_GPIO3, i * 0x20);
#endif
}
samsung_gpiolib_add_4bit_chips(exynos4_gpios_3, nr_chips, S5P_VA_GPIO3);