[media] media: i2c: tvp514x: add OF support

add OF support for the tvp514x driver.

Signed-off-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Hans Verkuil <hans.verkuil@cisco.com>
Cc: Mauro Carvalho Chehab <mchehab@redhat.com>
Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: Sylwester Nawrocki <s.nawrocki@samsung.com>
Cc: Sakari Ailus <sakari.ailus@iki.fi>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Rob Landley <rob@landley.net>
Cc: devicetree-discuss@lists.ozlabs.org
Cc: linux-doc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: davinci-linux-open-source@linux.davincidsp.com
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

2 files changed, 100 insertions, 6 deletions

diff --git a/Documentation/devicetree/bindings/media/i2c/tvp514x.txt b/Documentation/devicetree/bindings/media/i2c/tvp514x.txt
new file mode 100644
index 000000000000..46752cc71f2e
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/tvp514x.txt
@@ -0,0 +1,44 @@
+* Texas Instruments TVP514x video decoder
+
+The TVP5146/TVP5146m2/TVP5147/TVP5147m1 device is high quality, single-chip
+digital video decoder that digitizes and decodes all popular baseband analog
+video formats into digital video component. The tvp514x decoder supports analog-
+to-digital (A/D) conversion of component RGB and YPbPr signals as well as A/D
+conversion and decoding of NTSC, PAL and SECAM composite and S-video into
+component YCbCr.
+
+Required Properties :
+- compatible : value should be either one among the following
+        (a) "ti,tvp5146" for tvp5146 decoder.
+        (b) "ti,tvp5146m2" for tvp5146m2 decoder.
+        (c) "ti,tvp5147" for tvp5147 decoder.
+        (d) "ti,tvp5147m1" for tvp5147m1 decoder.
+
+- hsync-active: HSYNC Polarity configuration for endpoint.
+
+- vsync-active: VSYNC Polarity configuration for endpoint.
+
+- pclk-sample: Clock polarity of the endpoint.
+
+For further reading on port node refer to Documentation/devicetree/bindings/
+media/video-interfaces.txt.
+
+Example:
+
+        i2c0@1c22000 {
+                ...
+                ...
+                tvp514x@5c {
+                        compatible = "ti,tvp5146";
+                        reg = <0x5c>;
+
+                        port {
+                                tvp514x_1: endpoint {
+                                        hsync-active = <1>;
+                                        vsync-active = <1>;
+                                        pclk-sample = <0>;
+                                };
+                        };
+                };
+                ...
+        };
diff --git a/drivers/media/i2c/tvp514x.c b/drivers/media/i2c/tvp514x.c
index b8061b5e3eac..864eb14ae9b1 100644
--- a/drivers/media/i2c/tvp514x.c
+++ b/drivers/media/i2c/tvp514x.c
@@ -39,6 +39,7 @@
 #include <media/v4l2-device.h>
 #include <media/v4l2-common.h>
 #include <media/v4l2-mediabus.h>
+#include <media/v4l2-of.h>
 #include <media/v4l2-ctrls.h>
 #include <media/tvp514x.h>
 #include <media/media-entity.h>
@@ -1056,6 +1057,42 @@ static struct tvp514x_decoder tvp514x_dev = {
 
 };
 
+static struct tvp514x_platform_data *
+tvp514x_get_pdata(struct i2c_client *client)
+{
+        struct tvp514x_platform_data *pdata;
+        struct v4l2_of_endpoint bus_cfg;
+        struct device_node *endpoint;
+        unsigned int flags;
+
+        if (!IS_ENABLED(CONFIG_OF) || !client->dev.of_node)
+                return client->dev.platform_data;
+
+        endpoint = v4l2_of_get_next_endpoint(client->dev.of_node, NULL);
+        if (!endpoint)
+                return NULL;
+
+        pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
+        if (!pdata)
+                goto done;
+
+        v4l2_of_parse_endpoint(endpoint, &bus_cfg);
+        flags = bus_cfg.bus.parallel.flags;
+
+        if (flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
+                pdata->hs_polarity = 1;
+
+        if (flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
+                pdata->vs_polarity = 1;
+
+        if (flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
+                pdata->clk_polarity = 1;
+
+done:
+        of_node_put(endpoint);
+        return pdata;
+}
+
 /**
  * tvp514x_probe() - decoder driver i2c probe handler
  * @client: i2c driver client device structure
@@ -1067,19 +1104,20 @@ static struct tvp514x_decoder tvp514x_dev = {
 static int
 tvp514x_probe(struct i2c_client *client, const struct i2c_device_id *id)
 {
+        struct tvp514x_platform_data *pdata = tvp514x_get_pdata(client);
         struct tvp514x_decoder *decoder;
         struct v4l2_subdev *sd;
         int ret;
 
+        if (pdata == NULL) {
+                dev_err(&client->dev, "No platform data\n");
+                return -EINVAL;
+        }
+
         /* Check if the adapter supports the needed features */
         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
                 return -EIO;
 
-        if (!client->dev.platform_data) {
-                v4l2_err(client, "No platform data!!\n");
-                return -ENODEV;
-        }
-
         decoder = devm_kzalloc(&client->dev, sizeof(*decoder), GFP_KERNEL);
         if (!decoder)
                 return -ENOMEM;
@@ -1091,7 +1129,7 @@ tvp514x_probe(struct i2c_client *client, const struct i2c_device_id *id)
                         sizeof(tvp514x_reg_list_default));
 
         /* Copy board specific information here */
-        decoder->pdata = client->dev.platform_data;
+        decoder->pdata = pdata;
 
         /**
          * Fetch platform specific data, and configure the
@@ -1231,8 +1269,20 @@ static const struct i2c_device_id tvp514x_id[] = {
 
 MODULE_DEVICE_TABLE(i2c, tvp514x_id);
 
+#if IS_ENABLED(CONFIG_OF)
+static const struct of_device_id tvp514x_of_match[] = {
+        { .compatible = "ti,tvp5146", },
+        { .compatible = "ti,tvp5146m2", },
+        { .compatible = "ti,tvp5147", },
+        { .compatible = "ti,tvp5147m1", },
+        { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, tvp514x_of_match);
+#endif
+
 static struct i2c_driver tvp514x_driver = {
         .driver = {
+                .of_match_table = of_match_ptr(tvp514x_of_match),
                 .owner = THIS_MODULE,
                 .name = TVP514X_MODULE_NAME,
         },