pinctrl: samsung: Add support for SoC-specific suspend/resume callbacks

SoC-specific driver might require additional save and restore of
registers. This patch adds pair of SoC-specific callbacks per pinctrl
device to account for this.
Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Tested-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-samsung.c

@@ -1010,6 +1010,9 @@ static void samsung_pinctrl_suspend_dev(
 				 reg, bank->pm_save[PINCFG_TYPE_FUNC]);
 		}
 	}
+
+	if (ctrl->suspend)
+		ctrl->suspend(drvdata);
 }
 
 /**
@@ -1026,6 +1029,9 @@ static void samsung_pinctrl_resume_dev(struct samsung_pinctrl_drv_data *drvdata)
 	void __iomem *virt_base = drvdata->virt_base;
 	int i;
 
+	if (ctrl->resume)
+		ctrl->resume(drvdata);
+
 	for (i = 0; i < ctrl->nr_banks; i++) {
 		struct samsung_pin_bank *bank = &ctrl->pin_banks[i];
 		void __iomem *reg = virt_base + bank->pctl_offset;

drivers/pinctrl/pinctrl-samsung.h

@@ -187,6 +187,9 @@ struct samsung_pin_ctrl {
 
 	int		(*eint_gpio_init)(struct samsung_pinctrl_drv_data *);
 	int		(*eint_wkup_init)(struct samsung_pinctrl_drv_data *);
+	void		(*suspend)(struct samsung_pinctrl_drv_data *);
+	void		(*resume)(struct samsung_pinctrl_drv_data *);
+
 	char		*label;
 };