[PATCH RFC v3] media: i2c: mt9p031: add OF support

Prabhakar Lad
2013-05-03T06:52:26Z

From: Lad, Prabhakar <prabhakar.csengg@gmail.com>

add OF support for the mt9p031 sensor driver.
Alongside this patch sorts the header inclusion alphabetically.

Signed-off-by: Lad, Prabhakar <prabhakar.csengg@gmail.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: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Rob Landley <rob@landley.net>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: devicetree-discuss@lists.ozlabs.org
Cc: davinci-linux-open-source@linux.davincidsp.com
Cc: linux-doc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
---
Changes for v2:
1: Used '-' instead of '_' for device properties.
2: Specified gpio reset pin as phandle in device node.
3: Handle platform data properly even if kernel is compiled with
devicetree support.
4: Used dev_* for messages in drivers instead of pr_*.
5: Changed compatible property to "aptina,mt9p031" and "aptina,mt9p031m".
6: Sorted the header inclusion alphabetically and fixed some minor code nits.

Changes for v3:
1: Dropped check if gpio-reset is valid.
2: Fixed some code nits.
3: Included a reference to the V4L2 DT bindings documentation.

.../devicetree/bindings/media/i2c/mt9p031.txt | 40 +++++++++++++
drivers/media/i2c/mt9p031.c | 60 +++++++++++++++++++-
2 files changed, 97 insertions(+), 3 deletions(-)
create mode 100644 Documentation/devicetree/bindings/media/i2c/mt9p031.txt

diff --git a/Documentation/devicetree/bindings/media/i2c/mt9p031.txt b/Documentation/devicetree/bindings/media/i2c/mt9p031.txt
new file mode 100644
index 0000000..e740541
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/mt9p031.txt
@@ -0,0 +1,40 @@
+* Aptina 1/2.5-Inch 5Mp CMOS Digital Image Sensor
+
+The Aptina MT9P031 is a 1/2.5-inch CMOS active pixel digital image sensor with
+an active array size of 2592H x 1944V. It is programmable through a simple
+two-wire serial interface.
+
+Required Properties :
+- compatible : value should be either one among the following
+ (a) "aptina,mt9p031" for mt9p031 sensor
+ (b) "aptina,mt9p031m" for mt9p031m sensor
+
+- input-clock-frequency : Input clock frequency.
+
+- pixel-clock-frequency : Pixel clock frequency.
+
+Optional Properties :
+-gpio-reset: Chip reset GPIO
+
+For further reading of port node refer Documentation/devicetree/bindings/media/
+video-interfaces.txt.
+
+Example:
+
+ i2c0@1c22000 {
+ ...
+ ...
+ mt9p031@5d {
+ compatible = "aptina,mt9p031";
+ reg = <0x5d>;
+ gpio-reset = <&gpio3 30 0>;
+
+ port {
+ mt9p031_1: endpoint {
+ input-clock-frequency = <6000000>;
+ pixel-clock-frequency = <96000000>;
+ };
+ };
+ };
+ ...
+ };
diff --git a/drivers/media/i2c/mt9p031.c b/drivers/media/i2c/mt9p031.c
index 28cf95b..4514f8f 100644
--- a/drivers/media/i2c/mt9p031.c
+++ b/drivers/media/i2c/mt9p031.c
@@ -16,9 +16,11 @@
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/gpio.h>
-#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/log2.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
#include <linux/pm.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
@@ -28,6 +30,7 @@
#include <media/v4l2-chip-ident.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
+#include <media/v4l2-of.h>
#include <media/v4l2-subdev.h>

#include "aptina-pll.h"
@@ -928,10 +931,50 @@ static const struct v4l2_subdev_internal_ops mt9p031_subdev_internal_ops = {
* Driver initialization and probing
*/

+static struct mt9p031_platform_data *
+mt9p031_get_pdata(struct i2c_client *client)
+{
+ struct device_node *np;
+ struct mt9p031_platform_data *pdata;
+
+ if (!IS_ENABLED(CONFIG_OF) || !client->dev.of_node)
+ return client->dev.platform_data;
+
+ np = v4l2_of_get_next_endpoint(client->dev.of_node, NULL);
+ if (!np)
+ return NULL;
+
+ pdata = devm_kzalloc(&client->dev, sizeof(struct mt9p031_platform_data),
+ GFP_KERNEL);
+ if (!pdata)
+ return NULL;
+
+ pdata->reset = of_get_named_gpio(client->dev.of_node, "gpio-reset", 0);
+ of_property_read_u32(np, "input-clock-frequency", &pdata->ext_freq);
+ of_property_read_u32(np, "pixel-clock-frequency", &pdata->target_freq);
+
+ return pdata;
+}
+
+#if IS_ENABLED(CONFIG_OF)
+static const struct of_device_id mt9p031_of_match[] = {
+ {
+ .compatible = "aptina,mt9p031",
+ .data = (void *)MT9P031_MODEL_COLOR,
+ }, {
+ .compatible = "aptina,mt9p031m",
+ .data = (void *)MT9P031_MODEL_MONOCHROME,
+ }, {
+ /* sentinel */
+ },
+};
+MODULE_DEVICE_TABLE(of, mt9p031_of_match);
+#endif
+
static int mt9p031_probe(struct i2c_client *client,
const struct i2c_device_id *did)
{
- struct mt9p031_platform_data *pdata = client->dev.platform_data;
+ struct mt9p031_platform_data *pdata = mt9p031_get_pdata(client);
struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
struct mt9p031 *mt9p031;
unsigned int i;
@@ -955,7 +998,17 @@ static int mt9p031_probe(struct i2c_client *client,
mt9p031->pdata = pdata;
mt9p031->output_control = MT9P031_OUTPUT_CONTROL_DEF;
mt9p031->mode2 = MT9P031_READ_MODE_2_ROW_BLC;
- mt9p031->model = did->driver_data;
+
+ if (!client->dev.of_node) {
+ mt9p031->model = (enum mt9p031_model)did->driver_data;
+ } else {
+ const struct of_device_id *of_id;
+
+ of_id = of_match_device(of_match_ptr(mt9p031_of_match),
+ &client->dev);
+ if (of_id)
+ mt9p031->model = (enum mt9p031_model)of_id->data;
+ }
mt9p031->reset = -1;

mt9p031->vaa = devm_regulator_get(&client->dev, "vaa");
@@ -1072,6 +1125,7 @@ MODULE_DEVICE_TABLE(i2c, mt9p031_id);

static struct i2c_driver mt9p031_i2c_driver = {
.driver = {
+ .of_match_table = of_match_ptr(mt9p031_of_match),
.name = "mt9p031",
},
.probe = mt9p031_probe,
--
1.7.4.1