[PATCH RFC v2] media: tvp514x: add OF support

[Prabhakar Lad <prabhakar.csengg@gmail.com>]

From: Lad, Prabhakar <prabhakar.lad@ti.com>

add OF support for the tvp514x driver.

Signed-off-by: Lad, Prabhakar <prabhakar.lad@ti.com>
Cc: Hans Verkuil <hans.verkuil@cisco.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.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
---
 Changes for v2:
  1: Fixed review comment pointed by Heiko.
  2: Fixed review comment pointed by Laurent.

 This patch is on top of following patches:
  1: https://patchwork.kernel.org/patch/1930941/
  2: http://patchwork.linuxtv.org/patch/16193/
  3: https://patchwork.kernel.org/patch/1944901

 .../devicetree/bindings/media/i2c/tvp514x.txt      |   38 +++++++++++
 drivers/media/i2c/tvp514x.c                        |   70 ++++++++++++++++++--
 2 files changed, 103 insertions(+), 5 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/tvp514x.txt

diff --git a/Documentation/devicetree/bindings/media/i2c/tvp514x.txt b/Documentation/devicetree/bindings/media/i2c/tvp514x.txt
new file mode 100644
index 0000000..55d3ffd
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/tvp514x.txt
@@ -0,0 +1,38 @@
+* 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: Must be "ti,tvp514x-decoder"
+- hsync-active: HSYNC Polarity configuration for current interface.
+- vsync-active: VSYNC Polarity configuration for current interface.
+- data-active: Clock polarity of the current interface.
+
+Example:
+
+i2c0@1c22000 {
+	...
+	...
+
+	tvp514x@5c {
+		compatible = "ti,tvp514x-decoder";
+		reg = <0x5c>;
+
+		port {
+			tvp514x_1: endpoint {
+				/* Active high (Defaults to 0) */
+				hsync-active = <1>;
+				/* Active high (Defaults to 0) */
+				hsync-active = <1>;
+				/* Active low (Defaults to 0) */
+				data-active = <0>;
+			};
+		};
+	};
+	...
+};
diff --git a/drivers/media/i2c/tvp514x.c b/drivers/media/i2c/tvp514x.c
index a4f0a70..24ce759 100644
--- a/drivers/media/i2c/tvp514x.c
+++ b/drivers/media/i2c/tvp514x.c
@@ -12,6 +12,7 @@
  *     Hardik Shah <hardik.shah@ti.com>
  *     Manjunath Hadli <mrh@ti.com>
  *     Karicheri Muralidharan <m-karicheri2@ti.com>
+ *     Prabhakar Lad <prabhakar.lad@ti.com>
  *
  * This package is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -33,7 +34,9 @@
 #include <linux/delay.h>
 #include <linux/videodev2.h>
 #include <linux/module.h>
+#include <linux/of_device.h>
 
+#include <media/v4l2-of.h>
 #include <media/v4l2-async.h>
 #include <media/v4l2-device.h>
 #include <media/v4l2-common.h>
@@ -930,6 +933,58 @@ static struct tvp514x_decoder tvp514x_dev = {
 
 };
 
+#if defined(CONFIG_OF)
+static const struct of_device_id tvp514x_of_match[] = {
+	{.compatible = "ti,tvp514x-decoder", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, tvp514x_of_match);
+
+static struct tvp514x_platform_data
+	*tvp514x_get_pdata(struct i2c_client *client)
+{
+	if (!client->dev.platform_data && client->dev.of_node) {
+		struct tvp514x_platform_data *pdata;
+		struct v4l2_of_endpoint bus_cfg;
+		struct device_node *endpoint;
+
+		pdata = devm_kzalloc(&client->dev,
+				sizeof(struct tvp514x_platform_data),
+				GFP_KERNEL);
+		client->dev.platform_data = pdata;
+		if (!pdata)
+			return NULL;
+
+		endpoint = of_get_child_by_name(client->dev.of_node, "port");
+		if (endpoint)
+			endpoint = of_get_child_by_name(endpoint, "endpoint");
+
+		if (!endpoint) {
+			v4l2_info(client, "Using default data!!\n");
+		} else {
+			v4l2_of_parse_parallel_bus(endpoint, &bus_cfg);
+
+			if (bus_cfg.mbus_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
+				pdata->hs_polarity = 1;
+			if (bus_cfg.mbus_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
+				pdata->vs_polarity = 1;
+			if (bus_cfg.mbus_flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
+				pdata->clk_polarity = 1;
+		}
+	}
+
+	return client->dev.platform_data;
+}
+#else
+#define tvp514x_of_match NULL
+
+static struct tvp514x_platform_data
+	*tvp514x_get_pdata(struct i2c_client *client)
+{
+	return client->dev.platform_data;
+}
+#endif
+
 /**
  * tvp514x_probe() - decoder driver i2c probe handler
  * @client: i2c driver client device structure
@@ -941,6 +996,7 @@ 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;
 	struct tvp514x_decoder *decoder;
 	struct v4l2_subdev *sd;
 	int ret;
@@ -949,22 +1005,25 @@ tvp514x_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 		return -EIO;
 
+	pdata = tvp514x_get_pdata(client);
+	if (!pdata) {
+		v4l2_err(client, "No platform data!!\n");
+		return -EPROBE_DEFER;
+	}
+
 	decoder = devm_kzalloc(&client->dev, sizeof(*decoder), GFP_KERNEL);
 	if (!decoder)
 		return -ENOMEM;
 
 	/* Initialize the tvp514x_decoder with default configuration */
 	*decoder = tvp514x_dev;
-	if (!client->dev.platform_data) {
-		v4l2_err(client, "No platform data!!\n");
-		return -EPROBE_DEFER;
-	}
+
 	/* Copy default register configuration */
 	memcpy(decoder->tvp514x_regs, tvp514x_reg_list_default,
 			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
@@ -1096,6 +1155,7 @@ MODULE_DEVICE_TABLE(i2c, tvp514x_id);
 
 static struct i2c_driver tvp514x_driver = {
 	.driver = {
+		.of_match_table = tvp514x_of_match,
 		.owner = THIS_MODULE,
 		.name = TVP514X_MODULE_NAME,
 	},
-- 
1.7.4.1