pinctrl: msm: Add sleep pinctrl state transitions

Add PM suspend callbacks to the msm core driver that select the
sleep and default pinctrl states. Then wire those callbacks up
in the sdm845 driver, for those boards that may have GPIO hogs
that need to change state during suspend.

Signed-off-by: Evan Green <[e-mail]>
Reviewed-by: Stephen Boyd <[e-mail]>
Reviewed-by: Bjorn Andersson <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

drivers/pinctrl/qcom/pinctrl-msm.c

···
 		}
 }
 
+static int msm_pinctrl_suspend(struct device *dev)
+{
+	struct msm_pinctrl *pctrl = dev_get_drvdata(dev);
+
+	return pinctrl_force_sleep(pctrl->pctrl);
+}
+
+static int msm_pinctrl_resume(struct device *dev)
+{
+	struct msm_pinctrl *pctrl = dev_get_drvdata(dev);
+
+	return pinctrl_force_default(pctrl->pctrl);
+}
+
+SIMPLE_DEV_PM_OPS(msm_pinctrl_dev_pm_ops, msm_pinctrl_suspend,
+		  msm_pinctrl_resume);
+
+EXPORT_SYMBOL(msm_pinctrl_dev_pm_ops);
+
 int msm_pinctrl_probe(struct platform_device *pdev,
 		      const struct msm_pinctrl_soc_data *soc_data)
 {

drivers/pinctrl/qcom/pinctrl-msm.h

···
 	unsigned int ntiles;
 };
 
+extern const struct dev_pm_ops msm_pinctrl_dev_pm_ops;
+
 int msm_pinctrl_probe(struct platform_device *pdev,
 		      const struct msm_pinctrl_soc_data *soc_data);
 int msm_pinctrl_remove(struct platform_device *pdev);

drivers/pinctrl/qcom/pinctrl-sdm845.c

···
 static struct platform_driver sdm845_pinctrl_driver = {
 	.driver = {
 		.name = "sdm845-pinctrl",
+		.pm = &msm_pinctrl_dev_pm_ops,
 		.of_match_table = sdm845_pinctrl_of_match,
 	},
 	.probe = sdm845_pinctrl_probe,