thermal: tango: add resume support

When this platform is suspended, firmware powers the entire SoC down,
except a few hardware blocks waiting for wakeup events. There is no
context to save for this particular block.

Therefore, there is nothing useful for the driver to do on suspend;
so we define a NULL suspend hook. On resume, the driver initializes
the block exactly as is done in the probe callback.

Signed-off-by: Marc Gonzalez <marc_gonzalez@sigmadesigns.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

1 files changed, 17 insertions, 2 deletions

diff --git a/drivers/thermal/tango_thermal.c b/drivers/thermal/tango_thermal.c
index 70e0d9f406e9..201304aeafeb 100644
--- a/drivers/thermal/tango_thermal.c
+++ b/drivers/thermal/tango_thermal.c
@@ -64,6 +64,12 @@ static const struct thermal_zone_of_device_ops ops = {
         .get_temp       = tango_get_temp,
 };
 
+static void tango_thermal_init(struct tango_thermal_priv *priv)
+{
+        writel(0, priv->base + TEMPSI_CFG);
+        writel(CMD_ON, priv->base + TEMPSI_CMD);
+}
+
 static int tango_thermal_probe(struct platform_device *pdev)
 {
         struct resource *res;
@@ -79,14 +85,22 @@ static int tango_thermal_probe(struct platform_device *pdev)
         if (IS_ERR(priv->base))
                 return PTR_ERR(priv->base);
 
+        platform_set_drvdata(pdev, priv);
         priv->thresh_idx = IDX_MIN;
-        writel(0, priv->base + TEMPSI_CFG);
-        writel(CMD_ON, priv->base + TEMPSI_CMD);
+        tango_thermal_init(priv);
 
         tzdev = devm_thermal_zone_of_sensor_register(&pdev->dev, 0, priv, &ops);
         return PTR_ERR_OR_ZERO(tzdev);
 }
 
+static int __maybe_unused tango_thermal_resume(struct device *dev)
+{
+        tango_thermal_init(dev_get_drvdata(dev));
+        return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(tango_thermal_pm, NULL, tango_thermal_resume);
+
 static const struct of_device_id tango_sensor_ids[] = {
         {
                 .compatible = "sigma,smp8758-thermal",
@@ -99,6 +113,7 @@ static struct platform_driver tango_thermal_driver = {
         .driver = {
                 .name           = "tango-thermal",
                 .of_match_table = tango_sensor_ids,
+                .pm             = &tango_thermal_pm,
         },
 };