[PATCH 5/6] imx074: support asynchronous probing

[Guennadi Liakhovetski]

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

Signed-off-by: Guennadi Liakhovetski <g.liakhovet...@gmx.de>
---
 drivers/media/i2c/soc_camera/imx074.c |   23 ++++++++++++++++++++---
 1 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/drivers/media/i2c/soc_camera/imx074.c 
b/drivers/media/i2c/soc_camera/imx074.c
index cee5345..a097dd1 100644
--- 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>
 #include <media/v4l2-chip-ident.h>
@@ -79,6 +80,7 @@ struct imx074 {
        struct v4l2_subdev              subdev;
        const struct imx074_datafmt     *fmt;
        struct v4l2_clk                 *clk;
+       struct v4l2_async_subdev_list   asdl;
 };
 
 static const struct imx074_datafmt imx074_colour_fmts[] = {
@@ -455,14 +457,27 @@ static int imx074_probe(struct i2c_client *client,
 
        priv->fmt       = &imx074_colour_fmts[0];
 
+       priv->asdl.subdev = &priv->subdev;
+       priv->asdl.dev = &client->dev;
+
+       ret = v4l2_async_subdev_bind(&priv->asdl);
+       if (ret < 0)
+               return ret;
+
        priv->clk = v4l2_clk_get(&priv->subdev, "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 = imx074_video_probe(client);
        if (ret < 0)
-               v4l2_clk_put(priv->clk);
+               goto eprobe;
+
+       return v4l2_async_subdev_bound(&priv->asdl);
 
+eprobe:
+       v4l2_clk_put(priv->clk);
        return ret;
 }
 
@@ -471,7 +486,9 @@ 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_subdev_unbind(&priv->asdl);
        v4l2_clk_put(priv->clk);
+
        if (ssdd->free_bus)
                ssdd->free_bus(ssdd);
 
-- 
1.7.2.5

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