thermal: rcar: add rcar_zone_to_priv() macro

This patch adds rcar_zone_to_priv()
which is a helper macro for gettign private data.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/thermal/rcar_thermal.c b/drivers/thermal/rcar_thermal.c
index f2678ff0ed2b..90db951725da 100644
--- a/drivers/thermal/rcar_thermal.c
+++ b/drivers/thermal/rcar_thermal.c
@@ -44,6 +44,7 @@ struct rcar_thermal_priv {
 };
 
 #define MCELSIUS(temp)                  ((temp) * 1000)
+#define rcar_zone_to_priv(zone)         (zone->devdata)
 
 /*
  *              basic functions
@@ -98,7 +99,7 @@ static void rcar_thermal_bset(struct rcar_thermal_priv *priv, u32 reg,
 static int rcar_thermal_get_temp(struct thermal_zone_device *zone,
                            unsigned long *temp)
 {
-        struct rcar_thermal_priv *priv = zone->devdata;
+        struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
         int val, min, max, tmp;
 
         tmp = -200; /* default */