linux-4.4.1/of_gpiochip_add_pin_range() の履歴(No.1)

• 履歴一覧
• 差分 を表示
• 現在との差分 を表示
• ソース を表示
• linux-4.4.1/of_gpiochip_add_pin_range() へ行く。
  • 1 (2016-05-19 (木) 10:04:16)

---

参照元†

• linux-4.4.1/of_gpiochip_add()

説明†

• パス: linux-4.4.1/drivers/gpio/gpiolib-of.c

• FIXME: これは何？
  • 説明

引数†

• struct gpio_chip *chip
  • linux-4.4.1/gpio_chip

返り値†

• int

参考†

実装†

#ifdef CONFIG_PINCTRL

• • linux-4.4.1/CONFIG_PINCTRL

static int of_gpiochip_add_pin_range(struct gpio_chip *chip)
{
        struct device_node *np = chip->of_node;
        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;

• • linux-4.4.1/device_node
  • linux-4.4.1/of_phandle_args
  • linux-4.4.1/pinctrl_dev
  • linux-4.4.1/property

        if (!np)
                return 0;

        group_names = of_find_property(np, group_names_propname, NULL);

• • linux-4.4.1/of_find_property()

        for (;; index++) {
                ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3,
                                index, &pinspec);
                if (ret)
                        break;

• • linux-4.4.1/of_parse_phandle_with_fixed_args()

                pctldev = of_pinctrl_get(pinspec.np);
                if (!pctldev)
                        return -EPROBE_DEFER;

• • linux-4.4.1/of_pinctrl_get()

                if (pinspec.args[2]) {
                        if (group_names) {
                                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;
                                }
                        }

• • linux-4.4.1/of_property_read_string_index()
  • linux-4.4.1/strlen()

                        /* 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)
                                return ret;

• • linux-4.4.1/gpiochip_add_pin_range()
  • linux-4.4.1/pinctrl_dev_get_devname()

                } else {
                        /* npins == 0: special range */
                        if (pinspec.args[1]) {
                                pr_err("%s: Illegal gpio-range format.\n",
                                        np->full_name);
                                break;
                        }

• • linux-4.4.1/pr_err()

                        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;

• • linux-4.4.1/of_property_read_string_index()

                        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)
                                return ret;

• • linux-4.4.1/gpio_chip_add_pingroup_range()

                }
        }

        return 0;
}

#else
static int of_gpiochip_add_pin_range(struct gpio_chip *chip) { return 0; }
#endif

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