thermal/drivers/mediatek/lvts_thermal: Add suspend and resume

Add suspend and resume support to LVTS driver.
Signed-off-by: Balsam CHIHI <bchihi@baylibre.com>
[bero@baylibre.com: suspend/resume in noirq phase]
Co-developed-by: Bernhard Rosenkränzer <bero@baylibre.com>
Signed-off-by: Bernhard Rosenkränzer <bero@baylibre.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Reviewed-by: Alexandre Mergnat <amergnat@baylibre.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20231017190545.157282-3-bero@baylibre.com

drivers/thermal/mediatek/lvts_thermal.c

@@ -1297,6 +1297,38 @@ static const struct lvts_ctrl_data mt7988_lvts_ap_data_ctrl[] = {
 	}
 };
 
+static int lvts_suspend(struct device *dev)
+{
+	struct lvts_domain *lvts_td;
+	int i;
+
+	lvts_td = dev_get_drvdata(dev);
+
+	for (i = 0; i < lvts_td->num_lvts_ctrl; i++)
+		lvts_ctrl_set_enable(&lvts_td->lvts_ctrl[i], false);
+
+	clk_disable_unprepare(lvts_td->clk);
+
+	return 0;
+}
+
+static int lvts_resume(struct device *dev)
+{
+	struct lvts_domain *lvts_td;
+	int i, ret;
+
+	lvts_td = dev_get_drvdata(dev);
+
+	ret = clk_prepare_enable(lvts_td->clk);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < lvts_td->num_lvts_ctrl; i++)
+		lvts_ctrl_set_enable(&lvts_td->lvts_ctrl[i], true);
+
+	return 0;
+}
+
 static const struct lvts_ctrl_data mt8195_lvts_mcu_data_ctrl[] = {
 	{
 		.cal_offset = { 0x04, 0x07 },
@@ -1405,12 +1437,17 @@ static const struct of_device_id lvts_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, lvts_of_match);
 
+static const struct dev_pm_ops lvts_pm_ops = {
+	NOIRQ_SYSTEM_SLEEP_PM_OPS(lvts_suspend, lvts_resume)
+};
+
 static struct platform_driver lvts_driver = {
 	.probe = lvts_probe,
 	.remove_new = lvts_remove,
 	.driver = {
 		.name = "mtk-lvts-thermal",
 		.of_match_table = lvts_of_match,
+		.pm = &lvts_pm_ops,
 	},
 };
 module_platform_driver(lvts_driver);