1 static const struct samsung_pin_ctrl *
 2 samsung_pinctrl_get_soc_data(struct samsung_pinctrl_drv_data *d,
 3                  struct platform_device *pdev)
 4 {
 5     int id;
 6     const struct of_device_id *match;
 7     struct device_node *node = pdev->dev.of_node;
 8     struct device_node *np;
 
 9     const struct samsung_pin_bank_data *bdata;
10     const struct samsung_pin_ctrl *ctrl;
11     struct samsung_pin_bank *bank;
12     int i;
13 //這裡的id就是alias節點中pinctrl1 = "/[email protected]";中屬性名"pinctrl1"中的1
14     id = of_alias_get_id(node, "pinctrl");
15 // node的compatiable的值是"samsung,exynos4x12-pinctrl"，最終ctrl的指向的是exynos4x12_pin_ctrl[1]
 

16 /* 即：
17 {
18         .pin_banks    = exynos4x12_pin_banks1,
19         .nr_banks    = ARRAY_SIZE(exynos4x12_pin_banks1),
20         .eint_gpio_init = exynos_eint_gpio_init,  // 其他普通的並且具備中斷功能的gpio
21         .eint_wkup_init = exynos_eint_wkup_init,  // 這個pinctrl含有具備wakeup功能的gpio，其實就是XEINT0-31
22
 
         .suspend    = exynos_pinctrl_suspend,
23         .resume        = exynos_pinctrl_resume,
24     }, 
25 其中exynos4x12_pin_banks1的內容如下：
26 static const struct samsung_pin_bank_data exynos4x12_pin_banks1[] __initconst = {
27     EXYNOS_PIN_BANK_EINTG(7, 0x040, "gpk0", 0x08),
28 ... ...
29     EXYNOS_PIN_BANK_EINTG(8, 0x2E0, "gpm4", 0x34),
30  EXYNOS_PIN_BANK_EINTN(6, 0x120, "gpy0"),
31 ... ...
32     EXYNOS_PIN_BANK_EINTW(8, 0xC60, "gpx3", 0x0c),
33 };
34 這個跟datasheet是對應的，可以自己看看
35 這裡關注這三個巨集： EXYNOS_PIN_BANK_EINTG 會將eint_type設定為EINT_TYPE_GPIO
36 EXYNOS_PIN_BANK_EINTN會將eint_type設定為EINT_TYPE_NONE
37 EXYNOS_PIN_BANK_EINTW會將eint_type設定為EINT_TYPE_WKUP
38 */
39     match = of_match_node(samsung_pinctrl_dt_match, node);
40     ctrl = (struct samsung_pin_ctrl *)match->data + id;  // id表示第幾個pinctrl
41     d->suspend = ctrl->suspend;
42     d->resume = ctrl->resume;
43     d->nr_banks = ctrl->nr_banks; // 含有幾組bank
44     d->pin_banks = devm_kcalloc(&pdev->dev, d->nr_banks,    sizeof(*d->pin_banks), GFP_KERNEL);
45     bank = d->pin_banks;
46     bdata = ctrl->pin_banks;
47     for (i = 0; i < ctrl->nr_banks; ++i, ++bdata, ++bank) {
48         bank->type = bdata->type;
49         bank->pctl_offset = bdata->pctl_offset;
50         bank->nr_pins = bdata->nr_pins;  // 這個bank含有的gpio的個數
51         bank->eint_func = bdata->eint_func;
52         bank->eint_type = bdata->eint_type;  // 如 EINT_TYPE_GPIO、EINT_TYPE_NONE、EINT_TYPE_WKUP
53         bank->eint_mask = bdata->eint_mask;
54         bank->eint_offset = bdata->eint_offset;
55         bank->name = bdata->name;  // 如"gpx3"
56         spin_lock_init(&bank->slock);
57         bank->drvdata = d;
58         bank->pin_base = d->nr_pins;  // pin_base存放的是該bank中的第一個gpio的邏輯gpio號
59         d->nr_pins += bank->nr_pins;
60     }
61     for_each_child_of_node(node, np) { // 遍歷[email protected]的子節點，記錄含有"gpio-controller"屬性的節點
62         if (!of_find_property(np, "gpio-controller", NULL))  // 
63             continue;
64         bank = d->pin_banks;
65         for (i = 0; i < d->nr_banks; ++i, ++bank) {
66             if (!strcmp(bank->name, np->name)) {
67                 bank->of_node = np;  // 獲得可以作為gpio控制器的子節點的device node
68                 break;
69             }
70         }
71     }
72     d->pin_base = pin_base;  // pin_base存放的是當前系統的gpio的總個數，    d->pin_base存放的是當前pinctrl的第一個gpio的邏輯gpio號
73     pin_base += d->nr_pins;  // d->nr_pins存放的是當前pinctrl含有的gpio的總個數
74     return ctrl;
75 }