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gpiolib: port of_ functions to use gpiod

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Refactor the of_ functions of gpiolib to use the now public gpiod
interface, and export of_get_named_gpiod_flags() and
of_get_gpiod_flags() functions.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Alexandre Courbot 2013-10-17 10:21:37 -07:00 committed by Linus Walleij
parent 79a9becda8
commit af8b6375a8
2 changed files with 41 additions and 16 deletions
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28
drivers/gpio/gpiolib-of.c
View File

@ -15,19 +15,21 @@
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_gpio.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/slab.h>
struct gpio_desc;
/* Private data structure for of_gpiochip_find_and_xlate */
struct gg_data {
enum of_gpio_flags *flags;
struct of_phandle_args gpiospec;
int out_gpio;
struct gpio_desc *out_gpio;
};
/* Private function for resolving node pointer to gpio_chip */
@ -45,28 +47,31 @@ static int of_gpiochip_find_and_xlate(struct gpio_chip *gc, void *data)
if (ret < 0)
return false;
gg_data->out_gpio = ret + gc->base;
gg_data->out_gpio = gpio_to_desc(ret + gc->base);
return true;
}
/**
* of_get_named_gpio_flags() - Get a GPIO number and flags to use with GPIO API
* of_get_named_gpiod_flags() - Get a GPIO descriptor and flags for GPIO API
* @np: device node to get GPIO from
* @propname: property name containing gpio specifier(s)
* @index: index of the GPIO
* @flags: a flags pointer to fill in
*
* Returns GPIO number to use with Linux generic GPIO API, or one of the errno
* Returns GPIO descriptor to use with Linux GPIO API, or one of the errno
* value on the error condition. If @flags is not NULL the function also fills
* in flags for the GPIO.
*/
int of_get_named_gpio_flags(struct device_node *np, const char *propname,
int index, enum of_gpio_flags *flags)
struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
const char *propname, int index, enum of_gpio_flags *flags)
{
/* Return -EPROBE_DEFER to support probe() functions to be called
* later when the GPIO actually becomes available
*/
struct gg_data gg_data = { .flags = flags, .out_gpio = -EPROBE_DEFER };
struct gg_data gg_data = {
.flags = flags,
.out_gpio = ERR_PTR(-EPROBE_DEFER)
};
int ret;
/* .of_xlate might decide to not fill in the flags, so clear it. */
@ -78,16 +83,17 @@ int of_get_named_gpio_flags(struct device_node *np, const char *propname,
if (ret) {
pr_debug("%s: can't parse gpios property of node '%s[%d]'\n",
__func__, np->full_name, index);
return ret;
return ERR_PTR(ret);
}
gpiochip_find(&gg_data, of_gpiochip_find_and_xlate);
of_node_put(gg_data.gpiospec.np);
pr_debug("%s exited with status %d\n", __func__, gg_data.out_gpio);
pr_debug("%s exited with status %d\n", __func__,
PTR_RET(gg_data.out_gpio));
return gg_data.out_gpio;
}
EXPORT_SYMBOL(of_get_named_gpio_flags);
EXPORT_SYMBOL(of_get_named_gpiod_flags);
/**
* of_gpio_simple_xlate - translate gpio_spec to the GPIO number and flags

29
include/linux/of_gpio.h
View File

@ -21,6 +21,7 @@
#include <linux/of.h>
struct device_node;
struct gpio_desc;
/*
* This is Linux-specific flags. By default controllers' and Linux' mapping
@ -47,7 +48,7 @@ static inline struct of_mm_gpio_chip *to_of_mm_gpio_chip(struct gpio_chip *gc)
return container_of(gc, struct of_mm_gpio_chip, gc);
}
extern int of_get_named_gpio_flags(struct device_node *np,
extern struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
const char *list_name, int index, enum of_gpio_flags *flags);
extern int of_mm_gpiochip_add(struct device_node *np,
@ -62,10 +63,10 @@ extern int of_gpio_simple_xlate(struct gpio_chip *gc,
#else /* CONFIG_OF_GPIO */
/* Drivers may not strictly depend on the GPIO support, so let them link. */
static inline int of_get_named_gpio_flags(struct device_node *np,
static inline struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
const char *list_name, int index, enum of_gpio_flags *flags)
{
return -ENOSYS;
return ERR_PTR(-ENOSYS);
}
static inline int of_gpio_simple_xlate(struct gpio_chip *gc,
@ -80,6 +81,18 @@ static inline void of_gpiochip_remove(struct gpio_chip *gc) { }
#endif /* CONFIG_OF_GPIO */
static inline int of_get_named_gpio_flags(struct device_node *np,
const char *list_name, int index, enum of_gpio_flags *flags)
{
struct gpio_desc *desc;
desc = of_get_named_gpiod_flags(np, list_name, index, flags);
if (IS_ERR(desc))
return PTR_ERR(desc);
else
return desc_to_gpio(desc);
}
/**
* of_gpio_named_count() - Count GPIOs for a device
* @np: device node to count GPIOs for
@ -117,15 +130,21 @@ static inline int of_gpio_count(struct device_node *np)
}
/**
* of_get_gpio_flags() - Get a GPIO number and flags to use with GPIO API
* of_get_gpiod_flags() - Get a GPIO descriptor and flags to use with GPIO API
* @np: device node to get GPIO from
* @index: index of the GPIO
* @flags: a flags pointer to fill in
*
* Returns GPIO number to use with Linux generic GPIO API, or one of the errno
* Returns GPIO descriptor to use with Linux generic GPIO API, or a errno
* value on the error condition. If @flags is not NULL the function also fills
* in flags for the GPIO.
*/
static inline struct gpio_desc *of_get_gpiod_flags(struct device_node *np,
int index, enum of_gpio_flags *flags)
{
return of_get_named_gpiod_flags(np, "gpios", index, flags);
}
static inline int of_get_gpio_flags(struct device_node *np, int index,
enum of_gpio_flags *flags)
{