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Commit 762c2e46 authored by Masahiro Yamada's avatar Masahiro Yamada Committed by Linus Walleij

gpio: of: remove of_gpiochip_and_xlate() and struct gg_data

The usage of gpiochip_find(&gg_data, of_gpiochip_and_xlate) is odd.

Usually gpiochip_find() is used to find a gpio_chip.  Here, however,
the return value from gpiochip_find() is just discarded.  Instead,
gpiochip_find(&gg_data, of_gpiochip_and_xlate) is called for the
side-effect of the match function.

The match function, of_gpiochip_find_and_xlate(), fills the given
struct gg_data, but a match function should be simply called to
judge the matching.

This commit fixes this distortion and makes the code more readable.
Remove of_gpiochip_find_and_xlate() and struct gg_data.  Instead,
this adds a very simple helper function of_find_gpiochip_by_node().
Now, of_get_named_gpiod_flags() is implemented more straight-forward.
Signed-off-by: default avatarMasahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Walleij's avatarLinus Walleij <linus.walleij@linaro.org>
parent 1020dfd1
......@@ -26,38 +26,14 @@
#include "gpiolib.h"
/* Private data structure for of_gpiochip_find_and_xlate */
struct gg_data {
enum of_gpio_flags *flags;
struct of_phandle_args gpiospec;
struct gpio_desc *out_gpio;
/* Private function for resolving node pointer to gpio_chip */
static int of_gpiochip_find_and_xlate(struct gpio_chip *gc, void *data)
static int of_gpiochip_match_node(struct gpio_chip *chip, void *data)
struct gg_data *gg_data = data;
int ret;
if ((gc->of_node != gg_data->gpiospec.np) ||
(gc->of_gpio_n_cells != gg_data->gpiospec.args_count) ||
return false;
return chip->gpiodev->dev.of_node == data;
ret = gc->of_xlate(gc, &gg_data->gpiospec, gg_data->flags);
if (ret < 0) {
/* We've found a gpio chip, but the translation failed.
* Store translation error in out_gpio.
* Return false to keep looking, as more than one gpio chip
* could be registered per of-node.
gg_data->out_gpio = ERR_PTR(ret);
return false;
gg_data->out_gpio = gpiochip_get_desc(gc, ret);
return true;
static struct gpio_chip *of_find_gpiochip_by_node(struct device_node *np)
return gpiochip_find(np, of_gpiochip_match_node);
......@@ -74,34 +50,47 @@ static int of_gpiochip_find_and_xlate(struct gpio_chip *gc, void *data)
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 = ERR_PTR(-EPROBE_DEFER)
struct of_phandle_args gpiospec;
struct gpio_chip *chip;
struct gpio_desc *desc;
int ret;
/* .of_xlate might decide to not fill in the flags, so clear it. */
if (flags)
*flags = 0;
ret = of_parse_phandle_with_args(np, propname, "#gpio-cells", index,
if (ret) {
pr_debug("%s: can't parse '%s' property of node '%s[%d]'\n",
__func__, propname, np->full_name, index);
return ERR_PTR(ret);
gpiochip_find(&gg_data, of_gpiochip_find_and_xlate);
chip = of_find_gpiochip_by_node(gpiospec.np);
if (!chip) {
goto out;
if (chip->of_gpio_n_cells != gpiospec.args_count) {
desc = ERR_PTR(-EINVAL);
goto out;
ret = chip->of_xlate(chip, &gpiospec, flags);
if (ret < 0) {
desc = ERR_PTR(ret);
goto out;
desc = gpiochip_get_desc(chip, ret);
if (IS_ERR(desc))
goto out;
pr_debug("%s: parsed '%s' property of node '%s[%d]' - status (%d)\n",
__func__, propname, np->full_name, index,
return gg_data.out_gpio;
return desc;
int of_get_named_gpio_flags(struct device_node *np, const char *list_name,
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