media: ov9640: Use the generic clock framework

Commit 63839882c5 ("media: mach-pxa: palmz72/pcm990: 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>
Acked-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/ov9640.c

@@ -17,6 +17,7 @@
  * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
  */
 
+#include <linux/clk.h>
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/i2c.h>
@@ -26,7 +27,6 @@
 #include <linux/videodev2.h>
 
 #include <media/v4l2-async.h>
-#include <media/v4l2-clk.h>
 #include <media/v4l2-common.h>
 #include <media/v4l2-ctrls.h>
 #include <media/v4l2-device.h>
@@ -333,13 +333,13 @@ static int ov9640_s_power(struct v4l2_subdev *sd, int on)
 	if (on) {
 		gpiod_set_value(priv->gpio_power, 1);
 		usleep_range(1000, 2000);
-		ret = v4l2_clk_enable(priv->clk);
+		ret = clk_prepare_enable(priv->clk);
 		usleep_range(1000, 2000);
 		gpiod_set_value(priv->gpio_reset, 0);
 	} else {
 		gpiod_set_value(priv->gpio_reset, 1);
 		usleep_range(1000, 2000);
-		v4l2_clk_disable(priv->clk);
+		clk_disable_unprepare(priv->clk);
 		usleep_range(1000, 2000);
 		gpiod_set_value(priv->gpio_power, 0);
 	}
@@ -719,7 +719,7 @@ static int ov9640_probe(struct i2c_client *client,
 
 	priv->subdev.ctrl_handler = &priv->hdl;
 
-	priv->clk = v4l2_clk_get(&client->dev, "mclk");
+	priv->clk = devm_clk_get(&client->dev, "mclk");
 	if (IS_ERR(priv->clk)) {
 		ret = PTR_ERR(priv->clk);
 		goto ectrlinit;
@@ -727,17 +727,15 @@ static int ov9640_probe(struct i2c_client *client,
 
 	ret = ov9640_video_probe(client);
 	if (ret)
-		goto eprobe;
+		goto ectrlinit;
 
 	priv->subdev.dev = &client->dev;
 	ret = v4l2_async_register_subdev(&priv->subdev);
 	if (ret)
-		goto eprobe;
+		goto ectrlinit;
 
 	return 0;
 
-eprobe:
-	v4l2_clk_put(priv->clk);
 ectrlinit:
 	v4l2_ctrl_handler_free(&priv->hdl);
 
@@ -749,7 +747,6 @@ static int ov9640_remove(struct i2c_client *client)
 	struct v4l2_subdev *sd = i2c_get_clientdata(client);
 	struct ov9640_priv *priv = to_ov9640_sensor(sd);
 
-	v4l2_clk_put(priv->clk);
 	v4l2_async_unregister_subdev(&priv->subdev);
 	v4l2_ctrl_handler_free(&priv->hdl);
 

drivers/media/i2c/ov9640.h

@@ -196,7 +196,7 @@ struct ov9640_reg {
 struct ov9640_priv {
 	struct v4l2_subdev		subdev;
 	struct v4l2_ctrl_handler	hdl;
-	struct v4l2_clk			*clk;
+	struct clk			*clk;
 	struct gpio_desc		*gpio_power;
 	struct gpio_desc		*gpio_reset;