[media] mt9t001: Add clock support

The sensor needs a master clock, handle it explictly in the driver.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

1 files changed, 25 insertions, 2 deletions

diff --git a/drivers/media/i2c/mt9t001.c b/drivers/media/i2c/mt9t001.c
index 9a0bb063aa9b..422e068f5f1b 100644
--- a/drivers/media/i2c/mt9t001.c
+++ b/drivers/media/i2c/mt9t001.c
@@ -12,6 +12,7 @@
  * published by the Free Software Foundation.
  */
 
+#include <linux/clk.h>
 #include <linux/i2c.h>
 #include <linux/log2.h>
 #include <linux/module.h>
@@ -118,6 +119,7 @@ struct mt9t001 {
         struct v4l2_subdev subdev;
         struct media_pad pad;
 
+        struct clk *clk;
         struct regulator_bulk_data regulators[2];
 
         struct mutex power_lock; /* lock to protect power_count */
@@ -189,9 +191,21 @@ static int mt9t001_reset(struct mt9t001 *mt9t001)
 
 static int mt9t001_power_on(struct mt9t001 *mt9t001)
 {
+        int ret;
+
         /* Bring up the supplies */
-        return regulator_bulk_enable(ARRAY_SIZE(mt9t001->regulators),
-                                     mt9t001->regulators);
+        ret = regulator_bulk_enable(ARRAY_SIZE(mt9t001->regulators),
+                                   mt9t001->regulators);
+        if (ret < 0)
+                return ret;
+
+        /* Enable clock */
+        ret = clk_prepare_enable(mt9t001->clk);
+        if (ret < 0)
+                regulator_bulk_disable(ARRAY_SIZE(mt9t001->regulators),
+                                       mt9t001->regulators);
+
+        return ret;
 }
 
 static void mt9t001_power_off(struct mt9t001 *mt9t001)
@@ -199,6 +213,9 @@ static void mt9t001_power_off(struct mt9t001 *mt9t001)
         regulator_bulk_disable(ARRAY_SIZE(mt9t001->regulators),
                                mt9t001->regulators);
 
+        clk_disable_unprepare(mt9t001->clk);
+}
+
 static int __mt9t001_set_power(struct mt9t001 *mt9t001, bool on)
 {
         struct i2c_client *client = v4l2_get_subdevdata(&mt9t001->subdev);
@@ -854,6 +871,12 @@ static int mt9t001_probe(struct i2c_client *client,
                 return ret;
         }
 
+        mt9t001->clk = devm_clk_get(&client->dev, NULL);
+        if (IS_ERR(mt9t001->clk)) {
+                dev_err(&client->dev, "Unable to get clock\n");
+                return PTR_ERR(mt9t001->clk);
+        }
+
         v4l2_ctrl_handler_init(&mt9t001->ctrls, ARRAY_SIZE(mt9t001_ctrls) +
                                                 ARRAY_SIZE(mt9t001_gains) + 4);