This patch adds pinctrl_for_sleep() in samsung_pinctrl_suspend()
to support configuration of "sleep" pinctrl state.

For example, we can configure "sleep" pinctrl state of "gpf1-6"
as "INPUT, PULL DOWN" by configuring power down mode register.

&pinctrl_5 {
        pinctrl-names = "default","sleep";
        pinctrl-0 = <&initial5>;
        pinctrl-1 = <&sleep5>;

        initial5: initial-state {
                samsung,pins = gpf1-6;
                samsung,pin-function = <EXYNOS_PIN_FUNC_INPUT>;
        };
        sleep5: sleep-state {
                samsung,pins = gpf1-6;
                samsung,pin-con-pdn = <EXYNOS_PIN_PDN_INPUT>;
                samsung,pin-pud-pdn = <EXYNOS_PIN_PULL_DOWN>;
        };
};

Signed-off-by: Youngmin Nam <redacted>
---
 drivers/pinctrl/samsung/pinctrl-samsung.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/pinctrl/samsung/pinctrl-samsung.c b/drivers/pinctrl/samsung/pinctrl-samsung.c
index e04f7fe0a65d..b4d12f8db475 100644
--- a/drivers/pinctrl/samsung/pinctrl-samsung.c
+++ b/drivers/pinctrl/samsung/pinctrl-samsung.c

@@ -1099,6 +1099,11 @@ static int __maybe_unused samsung_pinctrl_suspend(struct device *dev)
 {
        struct samsung_pinctrl_drv_data *drvdata = dev_get_drvdata(dev);
        int i;
+       int ret;
+
+       ret = pinctrl_force_sleep(drvdata->pctl_dev);
+       if (ret)
+               dev_err(dev, "could not set sleep pinstate %d\n", ret);

        for (i = 0; i < drvdata->nr_banks; i++) {
                struct samsung_pin_bank *bank = &drvdata->pin_banks[i];

@@ -1187,6 +1192,11 @@ static int __maybe_unused samsung_pinctrl_resume(struct device *dev)
        if (drvdata->retention_ctrl && drvdata->retention_ctrl->disable)
                drvdata->retention_ctrl->disable(drvdata);

+       /* For changing state without writing register. */
+       if (!IS_ERR(drvdata->pctl_dev->p) &&
+           !IS_ERR(drvdata->pctl_dev->hog_default))
+               drvdata->pctl_dev->p->state = drvdata->pctl_dev->hog_default;
+
        return 0;
 }