media: ov6650: Use the generic clock framework

Commit ce548396 ("media: mach-omap1: board-ams-delta.c: remove soc_camera dependencies")
removed the last in-tree user of this sensor. New users
will be required to use the generic clock framework,
so it's possible to convert the driver to use it.

Convert the driver to use the CCF, and drop the legacy
v4l2-clk API.
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Reviewed-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Reviewed-by: Petr Cvek <petrcvekcz@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/i2c/ov6650.c

@@ -22,13 +22,13 @@
  */
 
 #include <linux/bitops.h>
+#include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/i2c.h>
 #include <linux/slab.h>
 #include <linux/v4l2-mediabus.h>
 #include <linux/module.h>
 
-#include <media/v4l2-clk.h>
 #include <media/v4l2-ctrls.h>
 #include <media/v4l2-device.h>
 
@@ -194,7 +194,7 @@ struct ov6650 {
 		struct v4l2_ctrl *blue;
 		struct v4l2_ctrl *red;
 	};
-	struct v4l2_clk		*clk;
+	struct clk		*clk;
 	bool			half_scale;	/* scale down output by 2 */
 	struct v4l2_rect	rect;		/* sensor cropping window */
 	struct v4l2_fract	tpf;		/* as requested with s_frame_interval */
@@ -459,9 +459,9 @@ static int ov6650_s_power(struct v4l2_subdev *sd, int on)
 	int ret = 0;
 
 	if (on)
-		ret = v4l2_clk_enable(priv->clk);
+		ret = clk_prepare_enable(priv->clk);
 	else
-		v4l2_clk_disable(priv->clk);
+		clk_disable_unprepare(priv->clk);
 
 	return ret;
 }
@@ -821,14 +821,14 @@ static int ov6650_video_probe(struct v4l2_subdev *sd)
 	u8 pidh, pidl, midh, midl;
 	int i, ret = 0;
 
-	priv->clk = v4l2_clk_get(&client->dev, NULL);
+	priv->clk = devm_clk_get(&client->dev, NULL);
 	if (IS_ERR(priv->clk)) {
 		ret = PTR_ERR(priv->clk);
-		dev_err(&client->dev, "v4l2_clk request err: %d\n", ret);
+		dev_err(&client->dev, "clk request err: %d\n", ret);
 		return ret;
 	}
 
-	rate = v4l2_clk_get_rate(priv->clk);
+	rate = clk_get_rate(priv->clk);
 	for (i = 0; rate && i < ARRAY_SIZE(ov6650_xclk); i++) {
 		if (rate != ov6650_xclk[i].rate)
 			continue;
@@ -839,8 +839,8 @@ static int ov6650_video_probe(struct v4l2_subdev *sd)
 		break;
 	}
 	for (i = 0; !xclk && i < ARRAY_SIZE(ov6650_xclk); i++) {
-		ret = v4l2_clk_set_rate(priv->clk, ov6650_xclk[i].rate);
-		if (ret || v4l2_clk_get_rate(priv->clk) != ov6650_xclk[i].rate)
+		ret = clk_set_rate(priv->clk, ov6650_xclk[i].rate);
+		if (ret || clk_get_rate(priv->clk) != ov6650_xclk[i].rate)
 			continue;
 
 		xclk = &ov6650_xclk[i];
@@ -852,12 +852,12 @@ static int ov6650_video_probe(struct v4l2_subdev *sd)
 		dev_err(&client->dev, "unable to get supported clock rate\n");
 		if (!ret)
 			ret = -EINVAL;
-		goto eclkput;
+		return ret;
 	}
 
 	ret = ov6650_s_power(sd, 1);
 	if (ret < 0)
-		goto eclkput;
+		return ret;
 
 	msleep(20);
 
@@ -899,11 +899,6 @@ static int ov6650_video_probe(struct v4l2_subdev *sd)
 
 done:
 	ov6650_s_power(sd, 0);
-	if (!ret)
-		return 0;
-eclkput:
-	v4l2_clk_put(priv->clk);
-
 	return ret;
 }
 
@@ -1089,7 +1084,6 @@ static int ov6650_remove(struct i2c_client *client)
 {
 	struct ov6650 *priv = to_ov6650(client);
 
-	v4l2_clk_put(priv->clk);
 	v4l2_async_unregister_subdev(&priv->subdev);
 	v4l2_ctrl_handler_free(&priv->hdl);
 	return 0;