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pinctrl/gpio: non-linear GPIO ranges accesible from gpiolib

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This patch adds the infrastructure required to register non-linear gpio
ranges through gpiolib and the standard GPIO device tree bindings.

Signed-off-by: Christian Ruppert <christian.ruppert@abilis.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Christian Ruppert
2013-10-15 15:37:54 +02:00
committed by Linus Walleij
parent c8ce878206
commit 586a87e6ed
7 changed files with 176 additions and 9 deletions
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61
drivers/gpio/gpiolib-of.c
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@@ -190,10 +190,15 @@ static void of_gpiochip_add_pin_range(struct gpio_chip *chip)
struct of_phandle_args pinspec;
struct pinctrl_dev *pctldev;
int index = 0, ret;
const char *name;
static const char group_names_propname[] = "gpio-ranges-group-names";
struct property *group_names;
if (!np)
return;
group_names = of_find_property(np, group_names_propname, NULL);
for (;; index++) {
ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3,
index, &pinspec);
@@ -204,14 +209,56 @@ static void of_gpiochip_add_pin_range(struct gpio_chip *chip)
if (!pctldev)
break;
ret = gpiochip_add_pin_range(chip,
pinctrl_dev_get_devname(pctldev),
pinspec.args[0],
pinspec.args[1],
pinspec.args[2]);
if (pinspec.args[2]) {
if (group_names) {
ret = of_property_read_string_index(np,
group_names_propname,
index, &name);
if (strlen(name)) {
pr_err("%s: Group name of numeric GPIO ranges must be the empty string.\n",
np->full_name);
break;
}
}
/* npins != 0: linear range */
ret = gpiochip_add_pin_range(chip,
pinctrl_dev_get_devname(pctldev),
pinspec.args[0],
pinspec.args[1],
pinspec.args[2]);
if (ret)
break;
} else {
/* npins == 0: special range */
if (pinspec.args[1]) {
pr_err("%s: Illegal gpio-range format.\n",
np->full_name);
break;
}
if (ret)
break;
if (!group_names) {
pr_err("%s: GPIO group range requested but no %s property.\n",
np->full_name, group_names_propname);
break;
}
ret = of_property_read_string_index(np,
group_names_propname,
index, &name);
if (ret)
break;
if (!strlen(name)) {
pr_err("%s: Group name of GPIO group range cannot be the empty string.\n",
np->full_name);
break;
}
ret = gpiochip_add_pingroup_range(chip, pctldev,
pinspec.args[0], name);
if (ret)
break;
}
}
}