[media] imx074: support asynchronous probing

Both synchronous and asynchronous imx074 subdevice probing is supported by
this patch.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/i2c/soc_camera/imx074.c b/drivers/media/i2c/soc_camera/imx074.c
index 2d83678..1d384a3 100644 (file)
--- a/drivers/media/i2c/soc_camera/imx074.c
+++ b/drivers/media/i2c/soc_camera/imx074.c
@@ -18,6 +18,7 @@
 #include <linux/module.h>
 
 #include <media/soc_camera.h>
+#include <media/v4l2-async.h>
 #include <media/v4l2-clk.h>
 #include <media/v4l2-subdev.h>
 
@@ -437,13 +438,24 @@ static int imx074_probe(struct i2c_client *client,
        priv->fmt       = &imx074_colour_fmts[0];
 
        priv->clk = v4l2_clk_get(&client->dev, "mclk");
-       if (IS_ERR(priv->clk))
-               return PTR_ERR(priv->clk);
+       if (IS_ERR(priv->clk)) {
+               dev_info(&client->dev, "Error %ld getting clock\n", PTR_ERR(priv->clk));
+               return -EPROBE_DEFER;
+       }
+
+       ret = soc_camera_power_init(&client->dev, ssdd);
+       if (ret < 0)
+               goto epwrinit;
 
        ret = imx074_video_probe(client);
        if (ret < 0)
-               v4l2_clk_put(priv->clk);
+               goto eprobe;
 
+       return v4l2_async_register_subdev(&priv->subdev);
+
+epwrinit:
+eprobe:
+       v4l2_clk_put(priv->clk);
        return ret;
 }
 
@@ -452,7 +464,9 @@ static int imx074_remove(struct i2c_client *client)
        struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
        struct imx074 *priv = to_imx074(client);
 
+       v4l2_async_unregister_subdev(&priv->subdev);
        v4l2_clk_put(priv->clk);
+
        if (ssdd->free_bus)
                ssdd->free_bus(ssdd);