[PATCH v2 4/7] thermal: rcar_gen3_thermal: record and check number of TSCs found

[Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>]

Record how many TSCs are found in struct rcar_gen3_thermal_priv, this is
needed to be able to add hardware interrupts for trip points later. Also
add a check to make sure at least one TSC is found.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
---
 drivers/thermal/rcar_gen3_thermal.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/thermal/rcar_gen3_thermal.c b/drivers/thermal/rcar_gen3_thermal.c
index 9b6bc03dd142a8dd..3b6e85abfadc61a3 100644
--- a/drivers/thermal/rcar_gen3_thermal.c
+++ b/drivers/thermal/rcar_gen3_thermal.c
@@ -74,6 +74,7 @@ struct rcar_gen3_thermal_tsc {
 };
 
 struct rcar_gen3_thermal_priv {
+	unsigned int num_tscs;
 	struct rcar_gen3_thermal_tsc *tscs[TSC_MAX_NUM];
 };
 
@@ -305,6 +306,12 @@ static int rcar_gen3_thermal_probe(struct platform_device *pdev)
 			goto error_unregister;
 		}
 		tsc->zone = zone;
+		priv->num_tscs++;
+	}
+
+	if (!priv->num_tscs) {
+		ret = -ENODEV;
+		goto error_unregister;
 	}
 
 	return 0;
-- 
2.12.0