thermal: exynos: Support for TMU regulator defined at device tree

TMU probe function now checks for a device tree defined regulator.
For compatibility reasons it is allowed to probe driver even without
this regulator defined.

Acked-by: Jonghwa Lee <jonghwa3.lee@samsung.com>
Acked-by: Eduardo Valentin <eduardo.valentin@ti.com>
Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Amit Daniel Kachhap <amit.daniel@samsung.com>
Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com>

diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
index a6fc379..ec01dfe 100644 (file)
--- a/drivers/thermal/samsung/exynos_tmu.c
+++ b/drivers/thermal/samsung/exynos_tmu.c
@@ -29,6 +29,7 @@
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
 
 #include "exynos_thermal_common.h"
 #include "exynos_tmu.h"
@@ -48,6 +49,7 @@
  * @clk: pointer to the clock structure.
  * @temp_error1: fused value of the first point trim.
  * @temp_error2: fused value of the second point trim.
+ * @regulator: pointer to the TMU regulator structure.
  * @reg_conf: pointer to structure to register with core thermal.
  */
 struct exynos_tmu_data {
@@ -61,6 +63,7 @@ struct exynos_tmu_data {
        struct mutex lock;
        struct clk *clk;
        u8 temp_error1, temp_error2;
+       struct regulator *regulator;
        struct thermal_sensor_conf *reg_conf;
 };
 
@@ -527,10 +530,27 @@ static int exynos_map_dt_data(struct platform_device *pdev)
        struct exynos_tmu_data *data = platform_get_drvdata(pdev);
        struct exynos_tmu_platform_data *pdata;
        struct resource res;
+       int ret;
 
        if (!data)
                return -ENODEV;
 
+       /*
+        * Try enabling the regulator if found
+        * TODO: Add regulator as an SOC feature, so that regulator enable
+        * is a compulsory call.
+        */
+       data->regulator = devm_regulator_get(&pdev->dev, "vtmu");
+       if (!IS_ERR(data->regulator)) {
+               ret = regulator_enable(data->regulator);
+               if (ret) {
+                       dev_err(&pdev->dev, "failed to enable vtmu\n");
+                       return ret;
+               }
+       } else {
+               dev_info(&pdev->dev, "Regulator node (vtmu) not found\n");
+       }
+
        data->id = of_alias_get_id(pdev->dev.of_node, "tmuctrl");
        if (data->id < 0)
                data->id = 0;
@@ -698,6 +718,9 @@ static int exynos_tmu_remove(struct platform_device *pdev)
 
        clk_unprepare(data->clk);
 
+       if (!IS_ERR(data->regulator))
+               regulator_disable(data->regulator);
+
        return 0;
 }